A-A-55195.pdf

IINCH-POUND I

A-A-55195

7 April 1993

COMMERCIAL ITEN DESCRIPTION

THREAD: PARA-ARAMID, SPUN, INTERMEDIATE MODULUS

The General Services Administration has authorized the use of this Commercial Item Description in preference to MIL-T-441OO.

Abstract. This Commercial Item Description covers spun, para-aramid, intermediate modulus, thread used for machine and hand sewing. The thread is intended for use in sewing aramid materials for construction of protective combat clothing and other flight safety equipment. Type I typifies normal performance thread, whereas, Type II typifies higher performance thread for use on end-items that require use of a smaller sized sewing needle.

Classification. The thread shall be

Type I - Normal performance Type II - High performance in the following types:

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to: Defense Personnel Support Center, Clothing and Textiles Directorate, Attn: DPSC-FSSD, 2800 South 20th Street, Philadelphia, PA 19101-8419, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

AMsc N/A

DISTRIBUTION STATEMENT A. Approved for distribution

FSC 8310

public release;

is unlimited.

A Source: https://assist.dla.mil -- Downloaded: 2018-02-02T17:32Z

Check the source to verify that this is the current version before use.

Salient Characteristics. The staple fibers shall be made from para-aramid filament having a linear density of 1.5 denier per filament, and shall not carbonize at a temperature below 675°F. The color (shade) shall be as specified in the applicable end-item document or in the contract or purchase order. The shade of the end item thread, after removal of finish according to AATCC 132, when applicable, shall match the specified applicable shade Standard. Unless otherwise specified, the direction of the twist for single ply shall be “S” and for the plied thread shall be “=0,. The thread shall average not more than one full thread knot per 8 ounces. The thread shall have a soft finish and shall contain only the minimum amount of lubricant to facilitate sewing. Only non-staining and non-flame propagating finishes commonly used shall be permitted as sewing finishes unless prior approval is obtained from the Contracting Officer.

The thread shall be put-up in one continuous length per holder and shall be so wound that each turn and layer are free from entanglement.

Table I Physical requirements - Type I Nominal Plies Yards/pound Breaking Strength (pounds,min) Elongation Tex .Final Min Max Initial After Heat Aging Maximum

(Natural) (Natural & Dyed) (percent) 39 2 11,970 13,230 6.0 1.80 6 59 3 7,980 8,820 8.5 3.00 6 78 4 5,700 6,300 12.0 3.25 6 98 5 4,560 5,040 16.0 4.75 6 118 6 3,990 4,410 19.0 5.75 6 138 7 3,420 3,780 22.0 6.50 6

Table Ia Physical requirements - Type II Nominal Plies Yards/pound Breaking Strength (pounds,min) Elongation Tex Final Min Max Initial After Heat Aging Maximum

(Natural) (Natural & Dyed) (percent) 14 2 16 2 20 2 39 2 59 3 78 4 107 3 125 3 142 4

31,500 35,000 27,700 29,500 23,000 25,200 11,900 13,200 7,980 8,800 5,700 6,300 4,000 4,300 3,650 4,000 3,100 3,600

2.0 0.5 6

3.0 1.0 6

5.0 2.0 6

9.0 3.0 6

14.0 4.0 6

20.0 6.0 6

27.0 8.0 6

31.0 9.0 6

35.0 10.0 6

2Source: https://assist.dla.mil -- Downloaded: 2018-02-02T17:32Z

Table II End item tests Characteristic Requirement Test Method Fiber identification Para-aramid spun

Number of plies

Length per pound

Denier per filament

Melting Point of Synthetic Fibers

Shade match

Colorfastness:

Laundering (after

Breaking strength Initial intermediate modulus

Tables I and Ia

Tables I and Ia

1.5

Above 675° F

L/

3 cycles) ~1

Tables I and Ia l/

Visual ~1

ASTM D1907

ASTM D1577

FED STD 191-1534

Al

ASTM D2256 El After heat aging Tables I and Ia ASTM D2256 31

Elongation Tables I and Ia ASTM D2256 llJ/

Direction of twist Plied “z“ ASTM D1423 ~/ Single “S” ASTM D1423 I_/

Composition of plastic tubes &/ Q/ ~/ Unless otherwise specified, a certificate of compliance shall be submitted and will be acceptable for the stated requirement.

~/ One determination per sample unit shall be made and the result reported as “pass” or “fail”.

~/ The shade of the end item thread, after removal of finish, when applicable, shall match the specified applicable shade standard.

For other shades, address the contracting activity issuing the invitation for bids or request for proposal.

&/ Before evaluation for shade matching, the sample of thread shall be wet dry-cleaned in accordance with AATCC 132. Excess solvent shall be removed by centrifuging or wringin . The sample shall then be rinsed in distilled water at 120 80 to 160 F and dried at a temperature not exceeding 180° F. The dried sample shall then be conditioned for a minimum of 4 hours prior to evaluation for shade match. The thread sample shall be wound or prepared for examination in a manner similar to that for the standard shade sample. The sample shall be compared to the standard sample under artificial davliaht at 7000 ~500 K and less than a good match shall be a test failu;e.”The sample shall also be compared to the standard sample under incandescent lamplight at 2850 ~100 K and less than a good aPPrOx~matiOn shall be a test failure.

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The dyed and finished thread shall show fastness to laundering (after 3 cycles) equal to or better than the standard sample.

When no standard sample has been established or designated as applicable to colorfastness, the dyed and finished thread shal show a fastness rating of “4” to laundering (after 3 cycles).

The specimens must be dried after each of the 3 laundering cycles.

The color transfer cloth evaluation shall not apply.

At least five determinations shall be made per sample unit.

Five specimens shall be used for the heat aging test. The specimens shall be exposed for 4 hours to a temperature of 500 ~ 10°F using a circulating air oven. Upon removal, the specimens shall be conditioned at standard atmospheric conditions for 4 hours and then tested for breaking strength as specified in ASTN D1578.

To be determined simultaneously with breaking strength.

The tubes shall be made of commercially acceptable plastic.

Two to six grams of the thread, so held together to form a unit for testing. Unless otherwise specified in the procurement document, the laundering cycle of the Launder-O-Meter or similar machine shall be 30 minutes and the temperature of the container and its contents

0 +4° F (38° <2° C).shall be maintained at 100 _

Label/markinq. Except when commercial identification markings are specified in the invitation to bid, each holder shall have a label attached in such a manner as to remain in place and be clearly legible until all thread has been removed. The label shall be printed with the information as specified below.

Weight (net) Direction of twist Color Ply Number size Contract number Date manufactured (month and year) Name of contractor Nomenclature

Workmanship. After completion, the finished tubes of yarn shall be thorouahlv cleaned, and all loose thread, lint. and foreian matter remove;. i’he finished thread shall confo~ to the quality-established by this Commercial Item Description. The occurrence of defects shall not exceed the applicable Acceptable Quality Level (AQL).

Product Demonstration Model. When required, offerers shall submit samnles of their intended Production. The Product Demonstration Model wili consist of units inde~endently developed. Product Demonstration Models will be analyzed and evaluated by the government. Evaluation criteria and basis for award are contained in the solicitation. Product Demonstration Models will be retained by the government. One (1) Product Demonstration Model approved by DPSC under the resultant contract will serve as a manufacturing standard for the corresponding production items delivered under this contract. Offerers are advised that the Product Demonstration Model does not relieve the successful offerer of his responsibility to perform in accordance with the Commercial Item Description specified above.

Quality Assurance

Certification. The contractor shall certify that the product offered meets the salient characteristics of this description and that the product conforms to the producer’s own specifications, standards and quality assurance practices. The government reserves the right to require proof of.such conformance prior to the first delivery and thereafter as may be otherwise provided for, under the provisions of the contract.

Reliance on contractor QA systems shall not relieve the contractor of the responsibility of ensuring that all products or supplies submitted to the government for acceptance comply with all requirements of the contract.

Examination. Yarn tubes of lots shall be inspected in accordance with “Sampling Procedures and Tables for Inspection by Attributes”, AWSI/ASQC 21.4, published by the American Society for Quality Control.

Visual Examination. The thread shall be examined, while unwinding, for the defects listed in Table III. All defects shall be counted regardless of their proximity to each other. The lot size for holders shall be expressed in units of one holder and the sample unit shall.be one holder.

The inspection level for visual examination shall be S-3 and the Acceptable Quality Level (AQL) expressed in terms of defects per hundred units, shall be 2.5.

Table III Thread as Unwound Defects Examine Defect Continuous length Not in one continuous length.

Knots Thread on a holder averages more than one thread knot per eight ounces.

Winding Improperly or not firmly wound, resulting in kinks, knots, entangling, or slippage during unwinding, or otherwise affecting free unhampered unwinding of the thread.

Color Uneven, apparent on successive layers or end to end.

Tackiness or adhesion Strands adhere to each other or to holder, affecting unwinding tension.

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Packaqinq Examination. Thread on the holder shall be examined for the defects listed in Table IV. The lot size shall be exDressed in units of one holder. The inspection level shall be S-3, and the AQL, expressed in terms of defects per hundred units, shall be 2.5.

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Table IV Thread on Holder Defects

Examine Defect Identification label Missing, incorrect, incomplete, illegible, or insecurely attached.

Type of holder Other than specified.

Surface condition Loose or unattached ply. Cut tear, chafe, slip, affecting strength of thread or interfering with easy location of end and initial unwinding.

Finish Other than specified. Uneven lumpy,,bare or thin spots.

Reaulatorv Reauirements. The offeror/contractor is encouraged to use recovered materials in accordance with Public Law 94-580 to the maximum extent practicable.

End Item Performance Testinq. The end item shall be tested as indicated in Table II. The methods of testing specified, wherever applicable, shall be followed. The lot size shall be expressed in units of one holder. The sample unit shall be one wound holder or sufficient holders to provide enough thread for the applicable tests. The inspection level shall be s-1, and the AQL for each characteristic, expressed in terms of test failures per hundred units, shall be 2.5.

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Table V Sample Size for Testinq Lot size (tubes) Sample size (sample units) 50 or less 10 51 to 150 15 151 to 1000 25 1001 and over 25 per thousand

Preservation. Packina, and Markinq.

marking shall be as specified in the

The preservation, packing, and contract or order.

Source of Government Documents. Copies of Mil.

are available from:

tary and Federal documents

Standardization Documents Order Desk Bldg. 4D 700 Robbins Avenue Philadelphia, PA 19111-5094

Sources of Nonqovernment Documents.

ANSI/ASQC Z1.4 - Sampling Procedures and Tables For Inspection By Attributes

(Applications for copies should be addressed to American National Standards Institute, 1430 Broadway, New York, NY 10018-3308. )

ASTM tests

(Applications for copies should be addressed to American Society For Testing and Materials, 1916 Race Street, Philadelphia, PA 19103. )

AATCC tests

(Applications for copies should be addressed to Textile Chemists and Colorists (AATCC), P.O.Box

NC 27709-2215.

American Association of 12215, Triangle Park, Custodians:

Army - GL Navy - NU Air Force - 11

Review Activities:

Army - MD Navy - AS Air Force - 20, 82, 99

DLA - CT

Civil Agency Coordinating Activity:

GSA - FSS

Preparing Activity:

DLA - CT

Project No.831O-O194

..,. STANDARDIZATION DOCUMENT IMPROVEMENT PROPOSAL

1. The preparing activity mu~t complete blocks 1, 2, 3, and 8 In block 1, both the document number and revision letter should be given. I

2. The submitter of thk form mu$t complete block! 4,5.6, and 7. I

3. The preparing activity mutt provide a reply wnhiri 30 day$ from receipt of the form. I

NOTE: This form may not be wed to request copies ofdocuments, nor to request waivers, or clarification of :

requirements on current contracts. Comments submitted cm this form do not constitute or imply authorization to i waive any portion of the referenced document(s) or to amend contractual requirements. I

;l~iREco,M::MENDf~:cHmGE;i“ ‘“rw%iy?fn.. ~?m<7-:* ..,.% .;:1: 2“00cu?.+7v”Tt‘r’MMODJ

OOCUMf .11 TITLE TsRsAD: PAFcA-ARAMID, SPUN, I~IATS P!C2DOLUS

NATURE OF CHANGE Odencity paragraph numlHr ●nd include proposed rewritr. if pou’bk. Attach ●mra xheeu ●s needed,) , I

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REASON FOR RECOMMENDATION

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‘AME DEFENSE PESONNEL SUPPORT CENTER b l~Lc”I+JNc (jm<!udea~e~ c~el

ATTN : DPSC-FSSD (12-3-D)

(1)Commer<bal (2) AuT.JvON

2800 SOUTH 20th STREET

PHILADELPHIA, PA 19101-8419

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~D Form 1426, On i39 }V, ”,o”, !.,,<,,””, .,, O“,O! .!,