CFR-2017-title49-vol6-sec571-106.pdf

Nat’l Highway Traffic Safety Admin., DOT § 571.106

TABLE III—INOPERATIVE BRAKE POWER ASSIST AND BRAKE POWER UNITS

Stop No.

Average deceleration, FPSPS Equivalent stopping distance, feet

Column 1—brake power assist

Column 2—brake power unit

Column 3—brake power assist

Column 4—brake power unit

(a) (b) and

(c) (a) (b) and

(c) (a) (b) and

(c) (a) (b) and

(c)

1 .................................................... 16.0 14.0 16.0 13.0 242 277 242 298 2 .................................................... 12.0 12.0 13.0 11.0 323 323 298 352 3 .................................................... 10.0 10.0 12.0 10.0 388 388 323 388 4 .................................................... 9.0 8.5 11.0 9.5 431 456 352 409 5 .................................................... 8.0 7.5 10.0 9.0 484 517 388 431 6 .................................................... 7.5 6.7 9.5 8.5 517 580 409 456 7 .................................................... 1 7.0 1 6.0 9.0 8.0 554 646 431 484 8 .................................................... NA NA 8.5 7.5 NA NA 456 517 9 .................................................... NA NA 8.0 7.0 NA NA 484 554 10 .................................................. NA NA 7.5 6.5 NA NA 517 596 11 .................................................. NA NA 1 7.0 1 6.0 NA NA 554 646

1 Depleted. (a) Passenger cars; (b) vehicles other than passenger cars with GVWR of 10,000 lbs or less; (c) vehicles with GVWR greater than 10,000 lbs; NA = Not applicable.

[41 FR 29696, July 19, 1976]

EDITORIAL NOTE: For FEDERAL REGISTER citations affecting § 571.105, see the List of CFR Sections Affected, which appears in the Finding Aids section of the printed volume and at www.fdsys.gov.

§ 571.106 Standard No. 106; Brake hoses.

S1. Scope. This standard specifies la-beling and performance requirements for motor vehicle brake hose, brake hose assemblies, and brake hose end fittings.

S2. Purpose. The purpose of this standard is to reduce deaths and inju-ries occurring as a result of brake sys-tem failure from pressure or vacuum loss due to hose or hose assembly rup-ture.

S3. Application. This standard applies to passenger cars, multipurpose pas-senger vehicles, trucks, buses, trailers, and motorcycles, and to hydraulic, air, and vacuum brake hose, brake hose as-semblies, and brake hose end fittings for use in those vehicles.

S4. Definitions.

Armor means protective material in-stalled on a brake hose to increase the resistance of the hose or hose assembly to abrasion or impact damage.

Brake hose means a flexible conduit, other than a vacuum tubing connector, VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00353 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31 E R

S

E

.0

/G

P H kp ay ne o n D

S K

D

X V

N 1O

F R w ith

JO

B

49 CFR Ch. V (10–1–17 Edition) § 571.106 manufactured for use in a brake sys-tem to transmit or contain the fluid pressure or vacuum used to apply force to a vehicle’s brakes. For hose, a di-mensional description such as ‘‘1⁄4-inch hose’’ refers to the nominal inside di-ameter. For tubing, a dimensional de-scription such as ‘‘1⁄4-in tubing’’ refers to the nominal outside diameter.

Brake hose assembly means a brake hose, with or without armor, equipped with end fittings for use in a brake sys-tem, but does not include an air or vac-uum assembly prepared by the owner or operator of a used vehicle, by his employee, or by a repair facility, for installation in that used vehicle.

Brake hose end fitting means a cou-pler, other than a clamp, designed for attachment to the end of a brake hose.

Free length means the linear measure-ment of hose exposed between the end fittings of a hose assembly in a straight position.

Permanently attached end fitting means an end fitting that is attached by deformation of the fitting about the hose by crimping or swaging, or an end fitting that is attached by use of a sac-rificial sleeve or ferrule that requires replacement each time a hose assembly is rebuilt.

Preformed means a brake hose that is manufactured with permanent bends and is shaped to fit a specific vehicle without further bending.

Rupture means any failure that re-sults in separation of a brake hose from its end fitting or in leakage.

Vacuum tubing connector means a flexible conduit of vacuum that (i) con-nects metal tubing to metal tubing in a brake system, (ii) is attached without end fittings, and (iii) when installed, has an unsupported length less than the total length of those portions that cover the metal tubing.

S5. Requirements—hydraulic brake hose, brake hose assemblies, and brake hose end fittings.

S5.1 Construction. (a) Each hydraulic brake hose assembly shall have perma-nently attached brake hose end fittings which are attached by deformation of the fitting about the hose by crimping or swaging.

(b) Each hydraulic brake hose assem-bly that is equipped with a permanent supplemental support integrally at-tached to the assembly and is manufac-tured as a replacement for use on a ve-hicle not equipped, as an integral part of the vehicle’s original design, with a means of attaching the support to the vehicle shall be equipped with a brack-et that is integrally attached to the supplemental support and that adapts the vehicle to properly accept this type of brake hose assembly.

S5.2 Labeling.

S5.2.1 Each hydraulic brake hose, ex-cept hose sold as part of a motor vehi-cle, shall have at least two clearly identifiable stripes of at least one-six-teenth of an inch in width, placed on opposite sides of the brake hose par-allel to its longitudinal axis. One stripe may be interrupted by the information required by S5.2.2, and the other stripe may be interrupted by additional infor-mation at the manufacturer’s option.

However, hydraulic brake hose manu-factured for use only in an assembly whose end fittings prevent its installa-tion in a twisted orientation in either side of the vehicle, need not meet the requirements of S5.2.1.

S5.2.2 Each hydraulic brake hose shall be labeled, or cut from bulk hose that is labeled, at intervals of not more than 6 inches, measured from the end of one legend to the beginning of the next, in block capital letters and nu-merals at least one-eighth of an inch high, with the information listed in paragraphs (a) through (e) of this sec-tion. The information need not be present on hose that is sold as part of a brake hose assembly or a motor vehi-cle.

(a) The symbol DOT, constituting a certification by the hose manufacturer that the hose conforms to all applica-ble motor vehicle safety standards.

(b) A designation that identifies the manufacturer of the hose, which shall be filed in writing with: Office of Vehi-cle Safety Compliance, Equipment Di-vision NVS–222, National Highway Traffic Safety Administration, 400 Sev-enth St. SW., Washington, DC 20590.

The marking may consist of a designa-tion other than block capital letters required by S5.2.2.

(c) The month, day, and year, or the month and year, of manufacture, ex-pressed in numerals. For example, 10/1/ 96 means October 1, 1996.

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00354 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31kp ay ne o n D

S K

D

X V

N 1O

F R w ith

(d) The nominal inside diameter of the hose expressed in inches or frac-tions of inches, or in millimeters fol-lowed by the abbreviation ‘‘mm.’’

(e) Either ‘‘HR’’ to indicate that the hose is regular expansion hydraulic hose or ‘‘HL’’ to indicate that the hose is low expansion hydraulic hose.

S5.2.3 Package labeling for brake hose assemblies designed to be used with a sup-plemental support. (a) Each hydraulic brake hose assembly that is equipped with a permanent supplemental sup-port integrally attached to the assem-bly and is manufactured as a replace-ment assembly for a vehicle equipped, as an integral part of the vehicle’s original design, with a means of at-taching the support to the vehicle shall be sold in a package that is marked or labeled as follows: ‘‘FOR USE ON [insert Manufacturer, Model Name]

ONLY’’;

(b) Each hydraulic brake hose assem-bly that is equipped with a permanent supplemental support integrally at-tached to the assembly and is manufac-tured as a replacement for use on a ve-hicle not equipped, as an integral part of the vehicle’s original design, with a means of attaching the support to the vehicle shall comply with paragraphs

(a) (1) and (2) of this section:

(1) Be sold in a package that is marked or labeled as follows: ‘‘FOR

USE ONLY WITH A SUPPLEMENTAL

SUPPORT.’’

(2) Be accompanied by clear, detailed instructions explaining the proper in-stallation of the brake hose and the supplemental support bracket to the vehicle and the consequences of not at-taching the supplemental support bracket to the vehicle. The instruc-tions shall be printed on or included in the package specified in paragraph (a)(1) of this section.

S5.2.4 Each hydraulic brake hose as-sembly, except those sold as part of a motor vehicle, shall be labeled by means of a band around the brake hose assembly as specified in this paragraph or, at the option of the manufacturer, by means of labeling as specified in S5.2.4.1. The band may at the manufac-turer’s option be attached so as to move freely along the length of the as-sembly, as long as it is retained by the end fittings. The band shall be etched, embossed, or stamped in block capital letters, numerals or symbols at least one-eighth of an inch high, with the following information:

(a) The symbol DOT constituting cer-tification by the hose assembler that the hose assembly conforms to all ap-plicable motor vehicle safety stand-ards.

(b) A designation that identifies the manufacturer of the hose assembly, which shall be filed in writing with: Of-fice of Vehicle Safety Compliance, Equipment Division NVS–222, National Highway Traffic Safety Administra-tion, 400 Seventh St. SW., Washington, DC 20590. The designation may consist of block capital letters, numerals or a symbol.

S5.2.4.1 At least one end fitting of a hydraulic brake hose assembly shall be etched, stamped or embossed with a designation at least one-sixteenth of an inch high that identifies the manufac-turer of the hose assembly and is filed in accordance with S5.2.4(b).

S5.3 Test requirements. A hydraulic brake hose assembly or appropriate part thereof shall be capable of meet-ing any of the requirements set forth under this heading, when tested under the conditions of S13 and the applicable procedures of S6. However, a particular hose assembly or appropriate part thereof need not meet further require-ments after having been subjected to and having met the constriction re-quirement (S5.3.1) and any one of the requirements specified in S5.3.2 through S5.3.13.

S5.3.1 Constriction. Except for that part of an end fitting which does not contain hose, every inside diameter of any section of a hydraulic brake hose assembly shall be not less than 64 per-cent of the nominal inside diameter of the brake hose (S6.12).

S5.3.2 Expansion and burst strength.

The maximum expansion of a hydraulic brake hose assembly at 1,000 psi, 1,500 psi and 2,900 psi shall not exceed the values specified in Table I (S6.1), ex-cept that a brake hose larger than 3⁄16 inch or 5 mm is not subject to the 2,900 psi expansion test requirements. The hydraulic brake hose assembly shall then withstand water pressure of 4,000 psi for 2 minutes without rupture, and then shall not rupture at less than 7,000

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00355 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31kp ay ne o n D

S K

D

X V

N 1O

F R w ith psi for a 1⁄8 inch, 3 mm, or smaller di-ameter hose, or at less than 5,000 psi for a hose with a diameter larger than 1⁄8 inch or 3 mm (S6.2).

TABLE I—MAXIMUM EXPANSION OF FREE LENGTH BRAKE HOSE, CC/FT

Hydraulic brake hose, inside diameter

Test pressure

1,000 psi 1,500 psi 2,900 psi

Regular expansion hose

Low expansion hose

Low expansion hose

Regular expansion hose

Regular expansion hose

Low expansion hose

1⁄8 inch, or 3mm, or less ....................... 0.66 0.33 0.79 0.42 1.21 0.61 >1⁄8 inch or 3mm, to 3⁄16 inch or 5 mm 0.86 0.55 1.02 0.72 1.67 0.91 >3⁄16 inch or 5 mm ................................ 1.04 0.82 1.30 1.17 * *

S5.3.3 Whip resistance. A hydraulic brake hose assembly shall not rupture when run continuously on a flexing machine for 35 hours (S6.3).

S5.3.4 Tensile strength. A hydraulic brake hose assembly shall withstand a pull of 325 pounds without separation of the hose from its end fittings during a slow pull test, and shall withstand a pull of 370 pounds without separation of the hose from its end fittings during a fast pull test (S6.4).

S5.3.5 Water absorption and burst strength. A hydraulic brake hose assem-bly, after immersion in water for 70 hours (S6.5), shall withstand water pressure of 4,000 psi for 2 minutes, and then shall not rupture at less than 5,000 psi (S6.2).

S5.3.6 Water absorption and tensile strength. A hydraulic brake hose assem-bly, after immersion in water for 70 hours (S6.5), shall withstand a pull of 325 pounds without separation of the hose from its end fittings during a slow pull test, and shall withstand a pull of 370 pounds without separation of the hose from its end fittings during a fast pull test (S6.4).

S5.3.7 Water absorption and whip re-sistance. A hydraulic brake hose assem-bly, after immersion in water for 70 hours (S6.5), shall not rupture when run continuously on a flexing machine for 35 hours (S6.3).

S5.3.8 Low-temperature resistance. A hydraulic brake hose conditioned at a temperature between minus 49 degrees Fahrenheit (minus 45 degrees Celsius) and minus 54 degrees Fahrenheit (minus 48 degrees Celsius) for 70 hours shall not show cracks visible without magnification when bent around a cyl-inder as specified in S6.6 (S6.6).

S5.3.9 Brake fluid compatibility, con-striction, and burst strength. Except for brake hose assemblies designed for use with mineral or petroleum-based brake fluids, a hydraulic brake hose assembly shall meet the constriction require-ment of S5.3.1 after having been sub-jected to a temperature of 248 degrees Fahrenheit (120 degrees Celsius) for 70 hours while filled with SAE RM–66–04 ‘‘Compatibility Fluid,’’ as described in Appendix B of SAE Standard J1703 JAN95 (incorporated by reference, see § 571.5). It shall then withstand water pressure of 4,000 psi for 2 minutes and thereafter shall not rupture at less than 5,000 psi (S6.2 except all sizes of hose are tested at 5,000 psi).

S5.3.10 Ozone resistance. A hydraulic brake hose shall not show cracks visi-ble under 7-power magnification after exposure to ozone for 70 hours at 104 °F.

(S6.8).

S5.3.11 Dynamic ozone test. A hydrau-lic brake hose shall not show cracks visible without magnification after having been subjected to a 48-hour dy-namic ozone test (S6.9).

S5.3.12 High temperature impulse test.

A brake hose assembly tested under the conditions in S6.10:

(a) Shall withstand pressure cycling for 150 cycles, at 295 degrees Fahr-enheit (146 degrees Celsius) without leakage;

(b) Shall not rupture during a 2-minute, 4,000 psi pressure hold test, and;

(c) Shall not burst at a pressure less than 5,000 psi.

S5.3.13 End fitting corrosion resist-ance. After 24 hours of exposure to salt spray, a hydraulic brake hose end fit-ting shall show no base metal corrosion on the end fitting surface except where

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00356 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31kp ay ne o n D

S K

D

X V

N 1O

F R w ith crimping or the application of labeling information has caused displacement of the protective coating (S6.11).

S6. Test procedures—Hydraulic brake hose, brake hose assemblies, and brake hose end fittings.

S6.1. Expansion test.

S6.1.1 Apparatus. Utilize a test appa-ratus (as shown in Figure 1) which con-sists of:

(a) Source for required fluid pressure;

(b) Test fluid of water without any additives and free of gases;

(c) Reservoir for test fluid;

(d) Pressure gauges;

(e) Brake hose end fittings in which to mount the hose vertically; and

(f) Graduate burette with 0.05 cc in-crements.

FIG. 1—EXPANSION TEST APPARATUS

S6.1.2 Preparation. (a) Measure the free length of the hose assembly.

(b) Mount the hose so that it is in a vertical straight position without ten-sion when pressure is applied.

(c) Fill the hose with test fluid and bleed all gases from the system.

(d) Close the valve to the burette and apply 1,500 psi for 10 seconds; then re-lease pressure.

S6.1.3 Calculation of expansion at 1,000 and 1,500 psi. (a) Adjust the fluid level in the burette to zero.

(b) Close the valve to the burette, apply pressure at the rate of 15,000 psi per minute, and seal 1,000 psi in the hose (1,500 psi in the second series, and 2,900 psi in the third series).

(c) After 3 seconds open the valve to the burette for 10 seconds and allow the fluid in the expanded hose to rise into the burette.

(d) Repeat the procedure in steps (b) and (c) twice. Measure the amount of test fluid which has accumulated in the burette as a result of the three applica-tions of pressure.

(e) Calculate the volumetric expan-sion per foot by dividing the total ac-cumulated test fluid by 3 and further dividing by the free length of the hose in feet.

S6.2 Burst strength test. (a) Connect the brake hose to a pressure system and fill it completely with water, al-lowing all gases to escape.

(b) Apply water pressure of 4,000 psi at a rate of 15,000 psi per minute.

(c) After 2 minutes at 4,000 psi, in-crease the pressure at the rate of 15,000 psi per minute until the pressure ex-ceeds 5,000 psi for a brake hose larger than 1⁄8 inch or 3 mm diameter, or until the pressure exceeds 7,000 psi for a brake hose of 1⁄8 inch, 3 mm, or smaller diameter.

S6.3 Whip resistance test.

S6.3.1 Apparatus. Utilize test appa-ratus that is dynamically balanced and includes:

(a) A movable header consisting of a horizontal bar equipped with capped end fittings and mounted through bear-ings at each end to points 4 inches from the center of two vertically rotating disks whose edges are in the same vertical plane;

(b) An adjustable stationary header parallel to the movable header in the same horizontal plane as the centers of the disks, and fitted with open end fit-tings;

(c) An elapsed time indicator; and

(d) A source of water pressure con-nected to the open end fittings.

S6.3.2 Preparation. (a) Except for the supplemental support specified in S6.3.2(d), remove all external append-ages including, but not limited to, hose armor, chafing collars, mounting brackets, date band and spring guards.

(b) Measure the hose free length.

(c) Mount the hose in the whip test machine, introducing slack as specified in Table II for the size hose tested, VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00357 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31 E C

A

U

.0 kp ay ne o n D

S K

D

X V

N 1O

F R w ith measuring the projected length par-allel to the axis of the rotating disks.

The manufacturer may, at his option, adapt the fitting attachment points to permit mounting hose assemblies equipped with angled or other special fittings in the same orientation as hose assemblies equipped with straight fit-tings.

(d) In the case of a brake hose assem-bly equipped with a permanent supple-mental support integrally attached to the assembly, the assembly may be mounted using the supplemental sup-port and associated means of simu-lating its attachment to the vehicle.

Mount the supplemental support in the same vertical and horizontal planes as the stationary header end of the whip test fixture described in S6.3.1(b).

Mount or attach the supplemental sup-port so that it is positioned in accord-ance with the recommendation of the assembly manufacturer for attaching the supplemental support on a vehicle.

TABLE II—HOSE LENGTHS

Free length between end fittings, inches

Slack, inches

1⁄8 inch or 3 mm hose or less

More than 1⁄8 inch or

3 mm hose

8 to 151⁄2, inclusive ........................ 1.750 10 to 151⁄2, inclusive ...................... .................. 1,000 Over 151⁄2 to 19 inclusive .............. 1.250 Over 19 to 24, inclusive ................ 0.750

S6.3.3 Operation. (a) Apply 235 psi water pressure and bleed all gases from the system.

(b) Drive the movable head at 800 rpm.

S6.4 Tensile strength test. Utilize a tension testing machine conforming to the requirements of ASTM E4–03 (in-corporated by reference, see § 571.5) and provided with a recording device to measure the force applied.

S6.4.1 Preparation. Mount the hose assembly to ensure straight, evenly distributed machine pull.

S6.4.2 Operation. (a) Conduct the slow pull test by applying tension at a rate of 1 inch per minute travel of the moving head until separation occurs.

(b) Conduct the fast pull test by ap-plying tension at a rate of 2 inches per minute travel of the moving head until separation occurs.

S6.5 Water absorption sequence tests.

(a) Prepare three brake hose assem-blies and measure the free length of the hose assemblies.

(b) Immerse the brake hose assem-blies in distilled water at 185 degrees Fahrenheit (85 degrees Celsius) for 70 hours. Remove the brake hose assem-blies from the water and condition in air at room temperature for 30 min-utes.

(c) Conduct the tests in S6.2, S6.3, and S6.4, using a different hose for each sequence.

S6.6 Low temperature resistance test.

S6.6.1 Preparation. (a) Remove hose armor, if any, and condition the hose in a straight position in air at a tem-perature between minus 49 degrees Fahrenheit and minus 54 degrees Fahr-enheit (minus 45 degrees Celsius and minus 48 degrees Celsius) for 70 hours.

(b) Condition a cylinder in air at a temperature between minus 49 degrees Fahrenheit and minus 54 degrees Fahr-enheit (minus 45 degrees Celsius and minus 48 degrees Celsius) for 70 hours, using a cylinder of 21⁄2 inches in diame-ter for tests of hose less than 1⁄8 inch or 3mm, 3 inches in diameter for tests of 1⁄8 inch or 3 mm hose, 31⁄2 inches in di-ameter for tests of 3⁄16 to 1⁄4 inch hose or 4 mm to 6 mm hose, and 4 inches in di-ameter for tests of hose greater than 1⁄4 inch or 6 mm in diameter.

S6.6.2 Flexibility testing. Bend the conditioned hose 180 degrees around the conditioned cylinder at a steady rate in a period of 3 to 5 seconds. Ex-amine without magnification for cracks.

S6.7 Brake fluid compatibility test.

S6.7.1 Preparation. (a) Attach a hose assembly below a 1-pint reservoir filled with 100 ml. of SAE RM–66–04 Compat-ibility Fluid as shown in Figure 2.

(b) Fill the hose assembly with brake fluid, seal the lower end, and place the test assembly in an oven in a vertical position.

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00358 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31kp ay ne o n D

S K

D

X V

N 1O

F R w ith

S6.7.2 Oven treatment. (a) Condition the hose assembly at 200 °F. for 70 hours.

(b) Cool the hose assembly at room temperature for 30 minutes.

(c) Drain the brake hose assembly, immediately determine that every in-side diameter of any section of the hose assembly, except for that part of an end fitting which does not contain hose, is not less than 64 percent of the nominal inside diameter of the hose, and conduct the test specified in S6.2.

S6.8 Ozone resistance test. Utilize a cylinder with a diameter eight times the nominal outside diameter of the brake hose excluding armor.

S6.8.1 Preparation. After removing any armor, bind a hydraulic brake hose 360° around the cylinder. In the case of hose shorter than the circumference of the cylinder, bend the hose so that as much of its length as possible is in con-tact.

S6.8.2 Exposure to ozone. (a) Condi-tion the hose on the cylinder in air at room temperature for 24 hours.

(b) Immediately thereafter, condition the hose on the cylinder for 70 hours in an exposure chamber having an ambi-ent air temperature of 104 degrees Fahrenheit (40 degrees Celsius) during the test and containing air mixed with ozone in the proportion of 100 parts of ozone per 100 million parts of air by volume.

(c) Examine the hose for cracks under 7-power magnification, ignoring areas immediately adjacent to or with-in the area covered by binding.

S6.9 Dynamic ozone test.

S6.9.1 Apparatus. Utilize a test appa-ratus shown in Figure 3 which is con-structed so that:

(a) It has a fixed pin with a vertical orientation over which one end of the brake hose is installed.

(b) It has a movable pin that is ori-ented 30 degrees from vertical, with the top of the movable pin angled towards the fixed pin. The moveable pin main-tains its orientation to the fixed pin throughout its travel in the horizontal plane. The other end of the brake hose is installed on the movable pin.

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00359 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31 E C

A

U

.0

/G

P H kp ay ne o n D

S K

D

X V

N 1O

F R w ith

S6.9.2 Preparation. (a) Precondition the hose assembly by laying it on a flat surface in an unstressed condition, at room temperature, for 24 hours.

(b) Cut the brake hose assembly to a length of 8.6 inches (218 mm), such that no end fittings remain on the cut hose.

(c) Mount the brake hose onto the test fixture by fully inserting the fix-ture pins into each end of the hose. Se-cure the hose to the fixture pins using a band clamp at each end of the hose.

(d) Place the test fixture into an ozone chamber

(e) Stabilize the atmosphere in the ozone chamber so that the ambient temperature is 104 °F (40 degrees Cel-sius) and the air mixture contains air mixed with ozone in the proportion of 100 parts of ozone per 100 million parts of air by volume. This atmosphere is to remain stable throughout the remain-der of the test.

(f) Begin cycling the movable pin at a rate of 0.3 Hz. Continue the cycling for 48 hours.

(g) At the completion of 48 hours of cycling, remove the test fixture from the ozone chamber. Without removing the hose from the test fixture, visually examine the hose for cracks without magnification, ignoring areas imme-diately adjacent to or within the area covered by the band clamps. Examine the hose with the movable pin at any point along its travel.

S6.10 High temperature impulse test.

S6.10.1 Apparatus. (a) A pressure cy-cling machine to which one end of the brake hose assembly can be attached, with the entire hose assembly installed vertically inside of a circulating air oven. The machine shall be capable of increasing the pressure in the hose from zero psi to 1600 psi, and decreasing

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00360 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31 E R

D

E

.0

/G

P H kp ay ne o n D

S K

D

X V

N 1O

F R w ith the pressure in the hose from 1600 psi to zero psi, within 2 seconds.

(b) A circulating air oven that can reach a temperature of 295 degrees Fahrenheit (146 degrees Celsius) within 30 minutes, and that can maintain a constant 295 degrees F (146 degrees Cel-sius) thereafter, with the brake hose assembly inside of the oven and at-tached to the pressure cycling ma-chine.

(c) A burst test apparatus to conduct testing specified in S6.2

S6.10.2 Preparation. (a) Connect one end of the hose assembly to the pres-sure cycling machine and plug the other end of the hose. Fill the pressure cycling machine and hose assembly with SAE RM–66–04 ‘‘Compatibility Fluid,’’ as described in Appendix B of SAE Standard J1703 JAN95 (incor-porated by reference, see § 571.5) and bleed all gases from the system.

(b) Place the brake hose assembly in-side of the circulating air oven in a vertical position. Increase the oven temperature to 295 degrees F (146 de-grees Celsius) and maintain this tem-perature throughout the pressure cy-cling test.

(c) During each pressure cycle, the pressure in the hose is increased from zero psi to 1600 psi and held constant for 1 minute, then the pressure is de-creased from 1600 psi to zero psi and held constant for 1 minute. Perform 150 pressure cycles on the brake hose as-sembly.

(d) Remove the brake hose assembly from the oven, disconnect it from the pressure cycling machine, and drain the fluid from the hose. Cool the brake hose assembly at room temperature for 45 minutes.

(e) Wipe the brake hose using acetone to remove residual Compatibility Fluid. Conduct the burst strength test in S6.2, except all sizes of hose are test-ed at 5,000 psi.

S6.11 End fitting corrosion test. Uti-lize the apparatus described in ASTM B117–03 (incorporated by reference, see § 571.5).

S6.11.1 Construction. Construct the salt spray chamber so that:

(a) The construction material does not affect the corrosiveness of the fog.

(b) The hose assembly is supported or suspended 30 degrees from the vertical and parallel to the principal direction of the horizontal flow of fog through the chamber.

(c) The hose assembly does not con-tact any metallic material or any ma-terial capable of acting as a wick

(d) Condensation which falls from the assembly does not return to the solu-tion reservoir for respraying.

(e) Condensation from any source does not fall on the brake hose assem-blies or the solution collectors.

(f) Spray from the nozzles is not di-rected onto the hose assembly.

S6.11.2 Preparation. (a) Plug each end of the hose assembly.

(b) Mix a salt solution five parts by weight of sodium chloride to 95 parts of distilled water, using sodium chloride substantially free of nickel and copper, and containing on a dry basis not more than 0.1 percent of sodium iodide and not more than 0.3 percent total impuri-ties. Ensure that the solution is free of suspended solids before the solution is atomized.

(c) After atomization at 95 degrees Fahrenheit (35 degrees Celsius), ensure that the collected solution is in the PH range of 6.5 to 7.2. Make the PH meas-urements at 77 degrees Fahrenheit (28 degrees Celsius).

(d) Maintain a compressed air supply to the nozzle or nozzles free of oil and dirt and between 10 and 25 psi.

S6.11.3 Operation. Subject the brake hose assembly to the salt spray con-tinuously for 24 hours.

(a) Regulate the mixture so that each collector will collect from 1 to 2 milli-liters of solution per hour for each 80 square centimeters of horizontal col-lecting area.

(b) Maintain exposure zone tempera-ture at 95 degrees Fahrenheit (35 de-grees Celsius).

(c) Upon completion, remove the salt deposit from the surface of the hose by washing gently or dipping in clean run-ning water not warmer than 100 degrees Fahrenheit (38 degrees Celsius) and then drying immediately.

S6.12 Constriction test. Brake hose constriction test requirements shall be met using at least one of the methods specified in S6.12.1, S6.12.2, or S6.12.3.

S6.12.1 Plug gauge. (a) Utilize a plug gauge as shown in Figure 4. Diameter

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00361 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31kp ay ne o n D

S K

D

X V

N 1O

F R w ith

‘‘A’’ is equal to 64 percent of the nomi-nal inside diameter of the hydraulic brake hose being tested.

(b) Brake hose assemblies that are to be used for additional testing have con-striction testing only at each end fit-ting. Other brake hose assemblies may be cut into 3-inch lengths to permit constriction testing of the entire as-sembly. Hose assemblies with end fit-tings that do not permit entry of the gauge (e.g., restrictive orifice or banjo fitting) are cut 3 inches from the point at which the hose terminates in the end fitting and then tested from the cut end.

(c) Hold the brake hose in a straight position and vertical orientation.

(d) Place the spherical end of the plug gauge just inside the hose or end fitting. If the spherical end will not enter the hose or end fitting using no more force than gravity acting on the plug gauge, this constitutes failure of the constriction test.

(e) Release the plug gauge. Within 3 seconds, the plug gauge shall fall under the force of gravity alone up to the handle of the gauge. If the plug gauge does not fully enter the hose up to the handle of the gauge within three sec-onds, this constitutes failure of the constriction test.

S6.12.2 Extended plug gauge. (a) The test in 6.12.1 may be conducted with an extended plug gauge to enable testing of the entire brake hose from one end fitting, without cutting the brake hose.

The extended plug gauge weight and spherical diameter specifications are as shown in Figure 4, but the handle por-tion of the gauge may be deleted and the gauge length may be greater than 3 inches.

(b) The required performance of the extended plug gauge in S6.12.1(e) is that after the plug gauge is released, the extended plug gauge shall fall under the force of gravity alone at an average rate of 1 inch per second until the spherical diameter of the extended gauge passes through all portions of the brake hose assembly containing hose. If the extended plug gauge does not pass through all portions of the brake hose assembly containing hose at an average rate of 1 inch per second, this constitutes failure of the constric-tion test.

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00362 Fmt 8010 Sfmt 8006 Q:\49\49V6.TXT 31 E R

D

E

.0

/G

P H kp ay ne o n D

S K

D

X V

N 1O

F R w ith

S6.12.3 Drop ball test. (a) Utilize a rigid spherical ball with a diameter equal to 64 percent of the nominal in-side diameter of the hydraulic brake hose being tested. The weight of the spherical ball shall not exceed 2 ounces (57 grams).

(b) Hold the brake hose in a straight position and vertical orientation.

(c) Hold the ball just above the end fitting.

(d) Release the ball. The ball shall fall under the force of gravity alone completely through all portions of the brake hose assembly containing hose, at an average rate of 1 inch per second.

Failure of the ball to pass completely through all portions of the brake hose assembly containing hose, at an aver-age rate of 1 inch per second, con-stitutes failure of the constriction test.

S7. Requirements—Air brake hose, brake hose assemblies, and brake hose end fittings.

S7.1 Construction. Each air brake hose assembly shall be equipped with permanently attached brake hose end fittings or reusable brake hose end fit-tings. Each air brake hose constructed of synthetic or natural elastomeric rubber shall conform to the dimen-sional requirements specified in Table III, except for brake hose manufactured in metric sizes.

S7.2 Labeling S7.2.1 Hose. Each air brake hose shall be labeled, or cut from bulk hose that is labeled, at intervals of not more than 6 inches, measured from the end of one legend to the beginning of the next, in block capital letters and nu-merals at least one-eighth of an inch high, with the information listed in paragraphs (a) through (e) of this sec-tion. The information need not be present on hose that is sold as part of a brake hose assembly or a motor vehi-cle.

(a) The symbol DOT, constituting a certification by the hose manufacturer that the hose conforms to all applica-ble motor vehicle safety standards.

(b) A designation that identifies the manufacturer of the hose, which shall be filed in writing with: Office of Vehi-cle Safety Compliance, Equipment Di-vision NVS–222, National Highway Traffic Safety Administration, 400 Sev-enth St. SW., Washington, DC 20590.

The designation may consist of block capital letters, numerals, or a symbol.

(c) The month, day, and year, or the month and year, of manufacture, ex-pressed in numerals. For example, 10/1/ 96 means October 1, 1996.

(d) The nominal inside diameter of the hose expressed in inches or frac-tions of inches or in millimeters. The abbreviation ‘‘mm’’ shall follow hose sizes that are expressed in millimeters.

(Examples: 3⁄8, 1⁄2 (1⁄2SP in the case of 1⁄2 inch special air brake hose), 4mm, 6mm.)

(e) The type designation cor-responding to the brake hose dimen-sions in Table III. Type A shall be la-beled with the letter ‘‘A’’, Type AI shall be labeled with the letters ‘‘AI’’, and type AII shall be labeled with the letters ‘‘AII’’. Metric air brake hose shall be labeled with the letter ‘‘A.’’

TABLE III—AIR BRAKE HOSE DIMENSIONS—INSIDE DIAMETER (ID) AND OUTSIDE DIAMETER (OD)

DIMENSIONS IN INCHES (MILLIMETERS)

Min. I.D. ................................. 0.227 (5.8)

0.289 (7.3)

0.352 (8.9)

0.407 (10.3)

0.469 (11.9)

0.594 (15.1)

Max. I.D. ................................ 0.273 (6.9)

0.335 (8.5)

0.398 (10.1)

0.469 (11.9)

0.531 (13.5)

0.656 (16.7)

Min. O.D. ................................ 0.594 (15.1)

0.656 (16.7)

0.719 (18.3)

0.781 (19.8)

0.844 (21.4)

1.031 (26.2)

Max. O.D. ............................... 0.656 (16.7)

0.719 (18.3)

0.781 (19.8)

0.843 (21.4)

0.906 (23.0)

1.094 (27.8)

Type AI (2)—Hose Size—Nominal Inside Diameter

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00363 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31kp ay ne o n D

S K

D

X V

N 1O

F R w ith

TABLE III—AIR BRAKE HOSE DIMENSIONS—INSIDE DIAMETER (ID) AND OUTSIDE DIAMETER (OD) DIMENSIONS IN INCHES (MILLIMETERS)—Continued

3⁄16 1⁄4 5⁄16 13⁄32 1⁄2 5⁄8

Min. I.D. ................................. 0.188 (4.8)

0.250 (6.4)

0.312 (7.9)

0.406 (10.3)

0.500 (12.7)

0.625 (15.9)

Max. I.D. ................................ 0.214 (5.4)

0.281 (7.1)

0.343 (8.7)

0.437 (11.1)

0.539 (13.7)

0.667 (16.9)

Min. O.D. ................................ 0.472 (12.0)

0.535 (13.6)

0.598 (15.1)

0.714 (18.1)

0.808 (20.5)

0.933 (23.7)

Max. O.D. ............................... 0.510 (13.0)

0.573 (14.6)

0.636 (16.2)

0.760 (19.3)

0.854 (21.7)

0.979 (24.9)

Type AII (2)—Hose Size—Nominal Inside Diameter

3⁄16 1⁄4 5⁄16 13⁄32 1⁄2 5⁄8

Min. I.D. ................................. 0.188 (4.8)

0.250 (6.4)

0.312 (7.9)

0.406 (10.3)

0.500 (12.7)

0.625 (15.9)

Max. I.D. ................................ 0.214 (5.4)

0.281 (7.1)

0.343 (8.7)

0.437 (11.1)

0.539 (13.7)

0.667 (16.9)

Min. O.D. ................................ 0.500 (12.7)

0.562 (14.3)

0.656 (16.7)

0.742 (18.8)

0.898 (22.8)

1.054 (26.8)

Max. O.D. ............................... 0.539 (13.7)

0.602 (15.3)

0.695 (17.7)

0.789 (20.1)

0.945 (24.0)

1.101 (27.9)

(1) Notes: Type A, sizes 3⁄8, 7⁄16, and 1⁄2 Special can be assembled with reusable end fittings. All sizes can be assembled using permanently-attached (crimped) end fittings.

(2) Types AI and AII, all sizes, can be assembled with reusable or permanently-attached (crimped) end fittings.

S7.2.2 End fittings. Except for an end fitting that is attached by deformation of the fitting about a hose by crimping or swaging, at least one component of each air brake hose fitting shall be etched, embossed, or stamped in block capital letters and numerals at least one-sixteenth of an inch high with the following information:

(a) The symbol DOT, constituting a certification by the manufacturer of that component that the component conforms to all applicable motor vehi-cle safety standards.

(b) A designation that identifies the manufacturer of that component of the fitting, which shall be filed in writing with: Office of Vehicle Safety Compli-ance, Equipment Division NVS–222, Na-tional Highway Traffic Safety Admin-istration, 400 Seventh St. S.W., Wash-ington, DC 20590. The designation may consist of block capital letters, numer-als, or a symbol.

(c) The letter ‘‘A’’ shall indicate in-tended use in air brake systems. In the case of an end fitting intended for use in a reusable assembly with brake hose subject to Table III, ‘‘AI’’ or ‘‘AII’’ shall indicate use with Type I or Type II hose, respectively.

(d) The nominal inside diameter of the hose to which the fitting is prop-erly attached expressed in inches or fractions of inches or in millimeters.

(See examples in S7.2.1 (d).) The abbre-viation ‘‘mm’’ shall follow hose sizes that are expressed in millimeters.

S7.2.3 Assemblies. Each air brake hose assembly made with end fittings that are attached by crimping or swaging, except those sold as part of a motor ve-hicle, shall be labeled by means of a band around the brake hose assembly as specified in this paragraph or, at the option of the manufacturer, by means of labeling as specified in S7.2.3.1. The band may at the manufacturer’s option be attached so as to move freely along the length of the assembly, as long as it is retained by the end fittings. The band shall be etched, embossed, or stamped in block capital letters, nu-merals or symbols at least one-eighth of an inch high, with the following in-formation:

(a) The symbol DOT, constituting certification by the hose assembler

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00364 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31kp ay ne o n D

S K

D

X V

N 1O

F R w ith that the hose assembly conforms to all applicable motor vehicle safety stand-ards.

(b) A designation that identifies the manufacturer of the hose assembly, which shall be filed in writing with: Of-fice of Crash Avoidance Standards, Ve-hicle Dynamics Division, National Highway Traffic Safety Administra-tion, 400 Seventh Street SW., Wash-ington, DC 20590. The designation may consist of block capital letters, numer-als or a symbol.

S7.2.3.1 At least one end fitting of an air brake hose assembly made with end fittings that are attached by crimping or swaging shall be etched, stamped or embossed with a designa-tion at least one-sixteenth of an inch high that identifies the manufacturer of the hose assembly and is filed in ac-cordance with S7.2.3(b).

S7.3 Test requirements. Each air brake hose assembly or appropriate part thereof shall be capable of meet-ing any of the requirements set forth under this heading, when tested under the conditions of S13 and the applicable procedures of S8. However, a particular hose assembly or appropriate part thereof need not meet further require-ments after having met the constric-tion requirement (S7.3.1) and then hav-ing been subjected to any one of the re-quirements specified in S7.3.2 through S7.3.13.

S7.3.1 Constriction. Every inside di-ameter of any section of an air brake hose assembly shall not be less than 66 percent of the nominal inside diameter of the brake hose. (S8.14)

S7.3.2 High temperature resistance. An air brake hose shall not show external or internal cracks, charring, or disinte-gration visible without magnification when straightened after being bent for 70 hours at 212 degrees Fahrenheit (100 degrees Celsius) over a small test cyl-inder having the radius specified in Table IV for the size of hose tested.

(S8.1)

S7.3.3 Low temperature resistance.

The inside and outside surfaces of an air brake hose shall not show cracks as a result of conditioning at minus 40 de-grees Fahrenheit (minus 40 degrees Cel-sius) for 70 hours when bent around a large test cylinder having the radius specified in Table IV for the size of hose tested (S8.2).

TABLE IV—AIR BRAKE HOSE DIAMETERS AND TEST CYLINDER RADII

Nominal hose in-side diameter, inches 1 ............. 3⁄16 1⁄4 5⁄16 3⁄8 13⁄32 7⁄16, 1⁄2 5⁄8

Nominal hose in-side diameter, millimeters 1 ...... 4, 5 6 8 .............. 10 12 16

Small test cylinder, radius in inches (millimeters) 2 .... 1 (25) 11⁄2 (38) 13⁄4 (45) 13⁄4 (45) 17⁄8 (48) 2 (51) 21⁄2 (64)

Large test cyl-inder, radius in inches (millime-ters) 3 ................ 2 (51) 21⁄2 (64) 3 (76) 31⁄2 (89) 31⁄2 (89) 4 (102) 41⁄2

(114)

Notes:

1 These sizes are listed to provide test cylinder radii for brake hoses manufactured in these sizes. They do not represent conversions.

2 Small test cylinders are used for the high temperature resistance test.

3 Large test cylinders are used for the low temperature resistance, ozone resistance, and adhesion of wire-reinforced hose tests.

S7.3.4 Oil resistance. After immer-sion in ASTM No. 3 oil for 70 hours at 212 °F. the volume of a specimen pre-pared from the inner tube and cover of an air brake hose shall not increase more than 100 percent (S8.3).

S7.3.5 Ozone resistance. An air brake hose assembly shall not show cracks visible under 7-power magnification

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00365 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31kp ay ne o n D

S K

D

X V

N 1O

F R w ith after exposure to ozone for 70 hours at 104 degrees Fahrenheit (40 degrees Cel-sius) when bent around a test cylinder of the radius specified in Table IV for the size of hose tested (S8.4).

S7.3.6 Length change. An air brake hose shall not contract in length more than 7 percent nor elongate more than 5 percent when subjected to air pres-sure of 200 psi (S8.5).

S7.3.7 Adhesion. (a) Except for hose reinforced by wire, an air brake hose shall withstand a tensile force of 8 pounds per inch of length before sepa-ration of adjacent layers (S8.6).

(b) An air brake hose reinforced by wire shall permit a steel ball to roll freely along the entire length of the in-side of the hose when the hose is sub-jected to a vacuum of 25 inches of Hg and bent around a test cylinder (S8.13).

S7.3.8 Flex strength and air pressure leakage. An air brake hose assembly of the length specified in the table accom-panying Figure 5, when subjected to a flex test and internal pressure cycling, shall be capable of having its internal pressure increased from zero to 140 psi within 2 minutes with pressurized air supplied through an orifice (S8.7).

S7.3.9 Corrosion resistance and burst strength. An air brake hose assembly exposed to salt spray shall not rupture when exposed to hydrostatic pressure of 900 psi (S8.8).

S7.3.10 Tensile strength. An air brake hose assembly designed for use between a frame and axle or between a towed and towing vehicle shall withstand, without separation of the hose from its end fittings, a pull of 250 pounds if it is 1⁄4 inch, 6 mm, or less in nominal inside diameter, or a pull of 325 pounds if it is larger than 1⁄4 inch or 6 mm in nominal inside diameter. An air brake hose as-sembly designed for use in any other application shall withstand, without separation of the hose from its end fit-tings, a pull of 50 pounds if it is 1⁄4 inch, 6 mm, or less in nominal inside diame-ter, 150 pounds if it is larger than 1⁄4 inch or 6 mm and equal to or smaller than 1⁄2 inch or 12 mm in nominal in-side diameter, or 325 pounds if it is larger than 1⁄2 inch or 12 mm in nomi-nal inside diameter (S8.9).

S7.3.11 Water absorption and tensile strength. After immersion in distilled water for 70 hours, an air brake hose assembly designed for use between a frame and axle or between a towed and a towing vehicle shall withstand, with-out separation of the hose from its end fittings, a pull of 250 pounds if it is 1⁄4 inch or less or 6 mm or less in nominal inside diameter, or a pull of 325 pounds if it is larger than 1⁄4 inch or 6 mm in nominal inside diameter. After immer-sion in distilled water for 70 hours, an air brake hose assembly designed for use in any other application shall with-stand, without separation of the hose from its end fittings, a pull of 50 pounds if it is 1⁄4 inch or 6 mm or less in nominal inside diameter, 150 pounds if it is larger than 1⁄4 inch or 6 mm and equal to or smaller than 1⁄2 inch or 12 mm in nominal inside diameter, or 325 pounds if it is larger than 1⁄2 inch or 12 mm in nominal inside diameter. (S8.10)

S7.3.12 Zinc chloride resistance. The outer cover of an air brake hose shall not show cracks visible under 7-power magnification after immersion in a 50 percent zinc chloride aqueous solution for 200 hours (S8.11).

S7.3.13 End fitting corrosion resist-ance. After 24 hours of exposure to salt spray, air brake hose end fittings shall show no base metal corrosion on the end fitting surface except where crimp-ing or the application of labeling infor-mation causes a displacement of the protective coating.

S8. Test procedures—Air brake hose, brake hose assemblies, and brake hose end fittings.

S8.1 High temperature resistance test.

(a) Utilize a small test cylinder with a radius specified in Table IV for the size of hose tested.

(b) Bind the hose around the cylinder and condition it in an air oven for 70 hours at 212 degrees Fahrenheit (100 de-grees Celsius).

(c) Cool the hose to room tempera-ture, remove it from the cylinder and straighten it.

(d) Without magnification, examine the hose externally and cut the hose lengthwise and examine the inner tube.

S8.2 Low temperature resistance test.

(a) Utilize a large test cylinder with a radius specified in Table IV for the size of hose tested.

(b) Condition the cylinder and the brake hose, in a straight position, in a cold box at minus 40 °F. for 70 hours.

VerDate Sep<11>2014 15:52 Dec 19, 2017 Jkt 241230 PO 00000 Frm 00366 Fmt 8010 Sfmt 8010 Q:\49\49V6.TXT 31kp ay ne o n D

S K

D

X V

N 1O

F R w ith

(c) With the hose and cylinder at minus 40 degrees Fahrenheit (minus 40 degrees Celsius), bend the hose 180 de-grees around the cylinder at a steady rate in a period of 3 to 5 seconds. Re-move the hose from the test cylinder and visibly examine the exterior of the hose for cracks without magnification.

(d) Allow the hose to warm at room temperature for 2 hours. All reusable end fittings are removed from the hose.

All permanently-attached end fittings are cut away from the hose. Cut through one wall of the hose longitu-dinally along its entire length. Unfold the hose to permit examination of the interior surface. Visibly examine the interior of the hose for cracks without magnification.

S8.3 Oil resistance test. Utilize three test specimens and average the results.

S8.3.1 Preparation. Fashion a test specimen by cutting a rectangular block 2 inches long and not less than one-third of an inch in width, having a thickness of not more than one-six-teenth inch, from the brake hose and buff the specimen on both faces to en-sure smooth surfaces.

S8.3.2 Measurement. (a) Weigh each specimen to the nearest milligram in air (W1) and in distilled water (W2) at room temperature. If wetting is nec-essary to remove air bubbles, dip the specimen in acetone and thoroughly rinse it with distilled water.

(b) Immerse each specimen in ASTM IRM 903 oil for 70 hours at 212 degrees Fahrenheit (100 degrees Celsius) and then cool in ASTM IRM 903 oil at room temperature for 30 to 60 minutes.

(c) Dip the specimen quickly in ace-tone and blot it lightly with filter paper.

(d) Weigh each specimen in a tared weighing bottle (W3) and in distilled water (W4) within five minutes of re-moval from the cooling liquid.

(e) Calculate the percentage increase in volume follows:

Percent of increase=

[(W3¥W4)¥(W1¥W2)]/(W1¥W2) × 100

S8.4 Ozone resistance test. Conduct the test specified in S6.8, using air brake hose, except use the large test cylinder specified in Table IV for the size of hose tested.

S8.5 Length change test. (a) Position a test hose…