MIL-DTL-32708.pdf

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DISTRIBUTION STATEMENT A. Approved for public release. Distribution is unlimited.

INCH-POUND

MIL-DTL-32708

17 May 2022

DETAIL SPECIFICATION

LINER, TRIGGER FINGER MITTEN, EXTREME COLD WEATHER

This specification is approved for use by all Departments and Agencies of the Department of Defense.

1. SCOPE

1.1 Scope. This specification covers the extreme cold weather trigger finger mitten liner. This item is designed for wear in combination with a full mitten shell or a trigger finger mitten shell conforming to types I and II of MIL-DTL-32707.

1.2 Classification. The mitten liner is of one type in the following sizes, as specified (see 6.2).

1.2.1 Sizes.

Small

Medium

Large

Extra Large

2. APPLICABLE DOCUMENTS

2.1 General. The documents listed in this section are specified in sections 3 and 4 of this specification. This section does not include documents cited in other sections of this specification or recommended for additional information or as examples. While every effort has been made to ensure the completeness of this list, document users are cautioned that they must meet all specified requirements of documents cited in sections 3 and 4 of this specification, whether or not they are listed.

2.2 Government documents.

2.2.1 Specifications, standards, and handbooks. The following specifications, standards, and handbooks form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

COMMERCIAL ITEM DESCRIPTIONS

A-A-59826 - Thread, Nylon

DEPARTMENT OF DEFENSE SPECIFICATIONS

MIL-C-3735 - Cuffs, Knit, Wrist and Ankle, and Cloth, Knitted

MIL-DTL-32075 - Label: For Clothing, Equipage, and Tentage, (General Use)

MIL-PRF-32567 - Batting, Synthetic Fibers, Unquilted

MIL-DTL-32697 - Cloth, Napped French Terry

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MIL-DTL-32699 - Cloth, 70 Denier Nylon Ripstop

MIL-DTL-32707 - Mitten Shells, Full and Trigger Finger, Extreme Cold Weather

(Copies of these documents are available online at https://quicksearch.dla.mil/.)

U.S. DEPARTMENT OF AGRICULTURE (USDA)

United States Standards for Grades of Wool

(Copies of this document are available online at https://www.ams.usda.gov.)

2.3 Non-Government publications. The following documents form a part of this document to the extent specified herein. Unless otherwise specified, the issues of these documents are those cited in the solicitation or contract.

AMERICAN ASSOCIATION OF TEXTILE CHEMISTS AND COLORISTS (AATCC)

AATCC EP1 - Gray Scale for Color Change

AATCC EP9 - Visual Assessment of Color Difference of Textiles

AATCC TM20 - Test Method for Fiber Analysis: Qualitative

AATCC TM118 - Test Method for Oil Repellency: Hydrocarbon Resistance

AATCC TM127 - Test Method for Water Resistance: Hydrostatic Pressure

AATCC TM135 - Dimensional Changes of Fabrics After Home Laundering

(Copies of these documents are available online at www.aatcc.org.)

AMERICAN SOCIETY FOR QUALITY (ASQ)

ASQ/ANSI Z1.4 - Sampling Procedures and Tables for Inspection by Attributes

(Copies of this document are available online at www.asq.org.)

ASTM INTERNATIONAL

ASTM D737 - Standard Test Method for Air Permeability of Textile Fabrics

ASTM D1610 - Standard Practice for Conditioning Leather and Leather Products for

Testing

ASTM D1777 - Standard Test Method for Thickness of Textile Materials

ASTM D1814 - Standard Test Method for Measuring Thickness of Leather Units

ASTM D1912 - Standard Test Method for Cold-Crack Resistance of Upholstery Leather

ASTM D2209 - Standard Test Method for Tensile Strength of Leather

ASTM D2582 - Standard Test Method for Puncture-Propagation Tear Resistance of Plastic

Film and Thin Sheeting

ASTM D2617 - Standard Test Method for Total Ash in Leather

ASTM D2807 - Standard Test Method for Chromic Oxide in Leather (Perchloric Acid

Oxidation)

ASTM D2810 - Standard Test Method for pH of Leather

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ASTM D2821 - Standard Test Method for Measuring the Relative Stiffness of Leather by

Means of a Torsional Wire Apparatus

ASTM D3495 - Standard Test Method for Hexane Extraction of Leather

ASTM D3775 - Standard Test Method for End (Warp) and Pick (Filling) Count of Woven

Fabrics

ASTM D3776/D3776M - Standard Test Methods for Mass Per Unit Area (Weight) of Fabric

ASTM D3884 - Standard Guide for Abrasion Resistance of Textile Fabrics (Rotary

Platform, Double-Head Method)

ASTM D4705 - Standard Test Method for Stitch Tear of Leather, Double Hole

ASTM D5052 - Standard Test Method for Permeability of Leather to Water Vapor

ASTM D6076 - Standard Test Method for Shrinkage Temperature of Leather

ASTM D6193 - Standard Practice for Stitches and Seams

ASTM D6182 - Standard Test Method for Flexibility and Adhesion of Finish on Leather

ASTM D6797 - Standard Test Method for Bursting Strength of Fabrics Constant-Rate-of-

Extension (CRE) Ball Burst Test

ASTM D7255 - Standard Test Method for Abrasion Resistance of Leather (Rotary

Platform, Abraser Method)

ASTM E96/E96M - Standard Test Methods for Water Vapor Transmission of Materials

ASTM F3426 - Standard Test Method for Measuring the Thermal Insulation of Clothing

Items Using Heated Manikin Body Forms

(Copies of these documents are available online at www.astm.org.)

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION (ISO)

ISO 11640 - Leather – Tests for Colour Fastness – Colour Fastness to Cycles of to-and-fro

Rubbing

ISO 17075-2 - Leather – Chemical Determination of Chromium(VI) Content in Leather – Part 2:

Chromatographic Method

(Copies of these documents are available online at www.iso.org.)

SAE INTERNATIONAL

AMS-STD-595 - Colors Used in Government Procurement

(Copies of this document are available online at www.sae.org.)

2.4 Order of precedence. Unless otherwise noted herein or in the contract, in the event of a conflict between the text of this document and the references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemption has been obtained.

3. REQUIREMENTS

3.1 Inspections.

3.1.1 First article. When specified (see 6.2), a sample shall be subjected to first article inspection in accordance with 4.2.

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3.1.2 Conformance inspection. When specified (see 6.2), a sample shall be subjected to a conformance inspection in accordance with 4.3.

3.2 Standard sample. The finished trigger finger mitten liner and design shall match the standard sample

(see 6.4) for design and all other characteristics or acceptance criteria for which a standard sample is referenced.

3.3 Recycled, recovered, environmentally preferable, or biobased materials. Recycled, recovered, environmentally preferable, or biobased materials should be used to the maximum extent possible, provided that the material meets or exceeds the operational and maintenance requirements, and promotes economically advantageous life cycle costs.

3.4 Design. The trigger finger mitten liner is an inner mitten designed to be worn in combination with a mitten shell in extreme cold weather environments. The trigger finger design enables the wearer to move their first finger independently from the rest of the hand. The liner is part of a system that includes a waterproof full mitten shell, or trigger finger mitten shell conforming to type I and type II of MIL-DTL-32707. The liner can be worn over a glove insert if desired. The mitten liner consists of the following: the outside shell is constructed from a water repellant

70 denier nylon ripstop conforming to 3.5.1 and a water repellent goatskin leather trigger finger conforming to 3.5.2.

Grip material conforming to 3.5.3 is sewn at the fingertips on the outside of the nylon ripstop. The mitten liner is insulated on the front and the back of the hand, and the outer thumb, with material conforming to 3.5.6. The inside cuff and trigger finger is lined with napped wool French terry conforming to 3.5.4; the lining used on the front of the hand, back of the hand, and the inner and outer thumb is a napped wool lay-in conforming to 3.5.5. Each liner has an attached cuff conforming to 3.5.7. The liner has a label to identify the item, its size, its use, and care.

3.4.1 Figures. Figures 1 and 2 are furnished for informational purposes only. To the extent an inconsistency exists between the written specification and the figures, the written specification shall govern.

3.5 Materials and components.

3.5.1 Liner shell material. The cloth used to construct the liner’s outer shell shall be a water repellent urethane coated 70 denier nylon ripstop conforming to MIL-DTL-32699 (see 6.6.1).

3.5.2 Leather. The leather used to construct the trigger finger shall be a 2.25- to 2.75-ounce full grain goatskin conforming to the requirements in table I when tested as specified in 4.4.3. The leather shall be chrome tanned, light finish, fungicide and durable water repellent treated, backed by a waterproofing layer. The shade of the leather shall approximate Coyote 498, conforming to leather shade standard number 3898, and shall be drum dyed, struck through from grain to flesh.

TABLE I. Leather characteristics and requirements.

Characteristic Requirement

Thickness, ounces 2.25 to 2.75

Moisture vapor transmission rate (MVTR), grams per square meter in 24 hours, upright (minimum)

Water absorption resistance, percent absorption (maximum) 1/ 15

Oil and stain resistance, grade (minimum) 4

Abrasion resistance at 1,000 cycles with a CS-10 wheel and 500-gram load No russet exposure

Stiffness, degrees (maximum) 1/ 50

Stitch tear, pounds (minimum) 1/ 17

Elongation at 25-pound load, percent (maximum) 1/ 25

Shrink temperature, °C (minimum) 98±0.5

Veslic rubbing abrasion, rating after 80 cycles (minimum) 2/ 4, no damage

Cold crack resistance, visual after exposure at -30 °C No cracking

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TABLE I. Leather characteristics and requirements – Continued.

Characteristic Requirement

Finish adhesion, newtons/10 millimeters, dry and wet (minimum) 4

Flexibility and adhesion of finish at 30,000 cycles, at -20 °F No cracking or delamination

Hexane soluble materials, percent (maximum) 3/ 25

Chromic oxide, percent (minimum) 3/ 3.0 pH value (minimum) 3.3

Total ash, percent (maximum) 3/ 9.0

Determination of chromium (VI) content, mg/kg <3

FOOTNOTES:

1/ Passing values in 80 percent of tested samples required to pass.

2/ Value given using the AATCC EP1.

3/ Calculated on moisture-free basis.

3.5.3 Grip, fingertips. Grip material shall be sewn at the fingertips on the outside of the liner to aid in maintaining grip when the liner is used alone as well as in combination with a shell. The material shall be a

100-denier polyester with a raised hexagonal structure made of silicone and shall conform to the requirements listed in table II when tested as specified in 4.4.3.

TABLE II. Grip requirements.

Weight, ounces per square yard 11.0 to 14.0

Air permeability, cubic feet per minute (minimum) 18

Thickness (inch) 0.030 to 0.035

Fabric count, yarns per inch (minimum):

Warp 125

Fill 100

Puncture propagation, kilogram-force (minimum):

Warp 5

Fill 4

Abrasion, cycles (minimum) 3,000

Hydrostatic, centimeters (minimum) 18

3.5.4 Lining, inside cuff hem and trigger finger. The material used to line the inside cuff and trigger finger shall conform to MIL-DTL-32697.

3.5.5 Lining, front of hand, back of hand, and thumb. The lining used on the front of the hand, the back of the hand, and the inner and outer thumb, shall be a napped lay-in knit fabric. The lay-in for the fabric shall be

100 percent wool and the knit back shall be a 100 percent recycled polyester. The 100-percent wool lay-in shall make up 70±2 percent of the total weight of the fabric and the recycled polyester back shall make up 30±2 percent of the total fabric weight. The wool fiber shall be carded and spun into single yarns. One end of wool yarn shall be laid in per knit course. After knitting, the fabric shall be scoured and napped to form a disoriented pile on the face to meet a minimum thickness of 0.090 inch measured under 0.1 pound per square inch (psi). The shade of the fabric shall be natural. The napped lay-in shall conform to the requirements listed in table III when tested as specified in

4.4.3.

TABLE III. Napped wool lay-in requirements.

Fiber content 100% wool lay-in, 100% recycled polyester back

Weight, ounces per square yard 15.0 to 18.0

Thickness, inches, under 0.1 psi 0.090 to 0.1

Grade (minimum) 54s

Burst strength, pounds (minimum) 100

MVTR, grams per square meter in 24 hours, upright

(minimum)

1,400

Dimensional stability, percent (maximum) (after five laundering cycles):

Wales -8/+1

Courses -1/+8

3.5.6 Insulation. The insulation used in between the shell and the lining fabric on the front of the hand, the back of the hand, and the outer thumb, shall conform to type I, class 2 or class 3, type II, class 3, or type III, class 4 of MIL-PRF-32567 with the following exceptions for all classes:

a. The average clo value of all samples prior to the initial laundering shall be a minimum of 2.3 and after laundering shall be a minimum of 2.1, with no individual sample having a clo value measuring more than 10 percent less than the average.

b. Denier is not required to be as specified.

c. Fiber classification is not required to be hollow core, but shall be polyester and one of the following, or a mixture of the following:

(1) Continuous filament

(2) Staple cut fibers

(3) Microfibers

3.5.7 Cuff. A cuff shall be sewn onto the liner and provide a snug fit around the wrist measuring approximately 3 inches at the bottom edge of the cuff, when relaxed, for all sizes. The cuff shall conform to type I, class 2, size 2, of MIL-C-3735. The shade shall approximate Coyote 498.

3.5.8 Thread. The thread for all construction seams shall be size letter B (Tex size 45) conforming to

A-A-59826, type I, class B. The color shall approximate Coyote 498 to approximate the mitten liner.

3.5.9 Labels. Each liner shall have a combination identification-size label and instruction label. The inscription shall have a minimum font size of 10 points. The inscription legibility, label, and label attachment method shall last the expected life of the liner. The fastness to laundering requirements of MIL-DTL-32075 shall apply. The labels shall identify the item, boldly specify the size, and provide use and care instructions.

3.5.9.1 Identification-size label. The label shall be located on the outside of the terry lining, caught in the side seam of both mittens liners in a pair. The combination identification-size label shall conform to type VI, class 4, MIL-DTL-32075 and shall bear the following inscription:

LINER, TRIGGER FINGER MITTEN

SIZE: MEDIUM (EXAMPLE)

CONTRACT NO.:

CONTRACTOR’S NAME:

FIBER CONTENT:

3.5.9.2 Instruction label. The instruction label for the mitten liner shall conform to type VI, class 3 of

MIL-DTL-32075, and shall include the following information:

1. Machine wash on regular cycle in cold water.

2. Do not bleach.

3. Drip dry.

4. Do not iron.

5. Do not dryclean.

DO NOT REMOVE THIS LABEL

3.5.9.3 Combination identification-size instruction label. As an alternate, a combination identification-size instruction label may be used conforming to type VI, class 14 of MIL-DTL-32075.

3.5.9.4 Label/tag. Each mitten liner shall have an individual barcode placed on a paper tag for personal clothing items conforming to type VIII, class 17 of MIL-DTL-32075. The paper tag shall contain the National

Stock Number (NSN) and shall be standard bleached sulfate having a basis weight of 100 pounds. The paper used for the tags shall have a smooth finish to accept thermal transfer and direct printing. The tags shall have a hole and shall be attached to each item by a fastener. The tags shall be clearly legible and readable by a scanner.

3.6 Patterns. Standard patterns, providing a seam allowance of 1/8 inch for all seams, and 3/4 inch for the hem, will be furnished by the Government. The list of pattern parts and computer nomenclature in table IV is provided to ensure that the pattern set provided is complete. The Government patterns shall not be altered in any way, and are to be used only as a guide for cutting the contractor’s working patterns. The working patterns shall be identical to the

Government patterns, except that additional notching, if needed, to facilitate manufacture, is permitted. Also, minor modifications are permitted where necessary to accommodate the manufacturer’s processes and the use of automated equipment. These modifications shall not alter the serviceability or appearance requirements of the liner.

3.6.1 List of pattern parts. The component parts shall be cut from the specified material in accordance with the pattern parts listed in table IV.

TABLE IV. Pattern parts.

Material Nomenclature Cut Parts 1/

Liner shell TF-MITTEN-LINER-BACK_OF_HAND_RIPSTOP 1 left, 1 right

TF-MITTEN-LINER-PALM_RIPSTOP 1 left, 1 right

TF-MITTEN-LINER-OUTER_THUMB_RIPSTOP 1 left, 1 right

TF-MITTEN-LINER-INNER_THUMB_RIPSTOP 1 left, 1 right

TF-MITTEN-LINER-MAIN_GUSSET_RIPSTOP 1 left, 1 right

TF-MITTEN-LINER-PINKY_GUSSET_RIPSTOP 1 left, 1 right

TF-MITTEN-LINER-INSIDE_THUMB_GUSSET_RIPSTOP 1 left, 1 right

TF-MITTEN-LINER-OUTSIDE_THUMB_GUSSET_RIPSTOP 1 left, 1 right

Leather TF-MITTEN-LINER-TRIGGER_FINGER_BACK_LEATHER 1 left, 1 right

TF-MITTEN-LINER-TRIGGER_FINGER_PALM_LEATHER 1 left, 1 right

Grip TF-MITTEN-LINER-FINGERTIP_GRIP 1 left, 1 right

Lining, napped wool lay-in TF-MITTEN-LINER-BACK_OF_HAND_LINING 1 left, 1 right

TF-MITTEN-LINER-PALM_LINING 1 left, 1 right

TF-MITTEN-LINER-OUTER_THUMB_LINING 1 left, 1 right

TF-MITTEN-LINER-INNER_THUMB_LINING 1 left, 1 right

Insulation TF-MITTEN-LINER-BACK_OF_HAND_INSULATION 1 left, 1 right

TF-MITTEN-LINER-OUTER_THUMB_INSULATION 1 left, 1 right

TF-MITTEN-LINER-PALM_INSULATION 1 left, 1 right

TF-MITTEN-LINER-INNER_THUMB_INSULATION 1 left, 1 right

Lining, wool terry TF-MITTEN-LINER-TRIGGER_FINGER_BACK_TERRY 1 left, 1 right

TF-MITTEN-LINER-TRIGGER_FINGER_PALM_TERRY 1 left, 1 right

TF-MITTEN-LINER-TRIGGER_FINGER_GUSSET_TERRY 1 left, 1 right

TF-MITTEN-LINER-CUFF_PALM_TERRY 1 left, 1 right

TF-MITTEN-LINER-CUFF_BACK_TERRY 1 left, 1 right

Rib knit Cuff 2

FOOTNOTE:

1/ With the exception of the cuffs, pieces shall be cut face-to-face to create left and right cut parts.

3.7 Construction. The assembled mitten liner (referred to as “end item” in this specification) shall be as specified in table V to ensure uniform appearance, comfort, and durability in garrison use, combat, and field operations. The end item construction and appearance shall conform to the requirements of this document, characteristics specified in table V, and the finished dimensions specified (see 3.9) to maintain item configuration and compliance to end item and component performance tests (see 4.4 and 4.5).

TABLE V. Liner requirements.

Characteristic Requirement Test Method

Clo (dry thermal insulation) value (minimum) 1.75 4.5.2

3.7.1 Stitches, seams, and stitching. All seams shall exhibit a uniform appearance and conform to

ASTM D6193. Stitch types and stitches per inch shall be as listed in table VI. All material edges shall not ravel.

Edges may be turned-in, turned-under, or serged to prevent raveling.

TABLE VI. Stitch types and stitches per inch.

Operation Stitch Type Stitches per Inch

Topstitch, single needle stitch, or straight stitch 301 8 to 12

Baste 301 or 101 8 to 12

3.7.2 Tacking and backstitching. Ends of seams and rows of stitching with 301 type stitch, when not caught in other seams or stitching, shall be securely backstitched not less than 1/4 inch. Thread breaks (all stitch types) shall be secured by stitching back from the break not less than 1/2 inch.

3.8 Color matching.

3.8.1 Visual shade matching. The color and appearance of the cloth shall approximate the standard sample when tested as specified in 4.5.3.

3.8.2 Color. The exterior mitten liner materials shall be solid and shall closely approximate Coyote 498 shade, which conforms with AMS STD-595 chip #20150. The exterior materials and components shall meet the reflectance requirements specified in 3.8.2.1.

3.8.2.1 Spectral reflectance. The finished outer shell cloth and all of the components used shall meet the spectral reflectance values (in percent) for the visible/near infrared wavelength range, 600 to 860 nanometers for the colors specified in table VII as applicable when tested as specified in 4.5.4.

TABLE VII. Spectral reflectance.

Wavelengths Coyote 498

Nanometers Minimum Maximum

600 8 20

620 8 20

640 8 22

660 8 24

680 12 24

700 12 34

720 16 42

740 22 46

760 30 50

780 34 54

800 36 56

820 38 58

840 38 58

860 40 60

3.9 Finished measurements. Finished dimensions shall be in accordance with table VIII and measured in accordance with table IX.

TABLE VIII. Mitten liner finished dimensions (in inches).

Size

A:

Back of

Hand

Width

B:

Full

Length

C:

Wrist

Cuff

Width

D:

Thumb

Length

E:

Thumb

Width

F:

First

Finger

Length

G:

First

Finger

Width

H:

Finger

Mitt

Width

I:

Finger

Mitt

Length

J:

Fourchette

Width

Small 4-1/4 12-1/2 6 4 3 4-1/4 1-1/4 3-1/4 4 1/2

Medium 5 12-7/8 6-1/4 4-1/8 3 4-1/2 1-1/4 3-1/2 4-1/4 1/2

Large 5-1/4 13-1/4 6-1/2 4-1/4 3 4-3/4 1-1/2 3-3/4 4-1/2 1/2

Extra Large 5-1/2 13-5/8 6-3/4 4-3/8 3 5 1-1/2 4 4-3/4 1/2

Tolerance ±1/4 ±1/4 ±1/4 ±1/8 ±1/8 ±1/8 ±1/8 ±1/8 ±1/8 ±1/8

TABLE IX. Mitten liner methods of measurement.

Measurement Name Measurement Description Figure

A: Back of hand width Measurement taken on the back of the hand. Measurement parallel to the mitten liner opening, beginning at the side seam where the leather meets the nylon and ending at the opposite side seam.

B: Full length Measurement taken on the back of the hand beginning at the seam where the fourchette pieces meet to the bottom of the liner hem staying perpendicular to the liner hem.

C: Wrist cuff width Measurement taken on the palm side along the bottom edge of the cuff.

D: Thumb length Measurement taken on the back of the hand from the thumb tip following along the fourchette and ending where the fourchette meets the side seam.

TABLE IX. Mitten liner methods of measurement – Continued.

Measurement Name Measurement Description Figure

E: Thumb width Measurement taken across the back of the thumb from seam to seam at the thumb crotch staying parallel with the thumb tip.

F: First finger length Measurement taken on the back of the hand at the center of the finger beginning at the seam where the leather meets the shell down to the bottom of the leather where it meets the nylon.

G: First finger width Measurement taken across the back of the first finger, from seam to seam, parallel to the fingertip, at the finger crotch.

H: Finger mitt width Measurement taken across the back of the finger mitt width, from seam to seam, beginning at the finger crotch to the pinky side seam, parallel to the fingertip.

I: Finger mitt length Measurement taken on the back of the hand, beginning at the seam where the fourchette pieces meet, to the finger crotch, staying perpendicular to the liner hem.

TABLE IX. Mitten liner methods of measurement – Continued.

Measurement Name Measurement Description Figure

J: Fourchette width Measurement taken at the back of the hand across the fourchette, 1 inch up from the thumb crotch seam, staying parallel to the tip of the thumb.

3.10 Workmanship. The finished mitten liners shall be free from loose thread, foreign matter, and irregular defects that can adversely affect usage or durability. The finished items shall be uniform in quality, free from defects that adversely affect form, fit, or function, and the defects specified in 4.4.1. The occurrence of defects shall not exceed the established acceptance quality limits (AQLs) (see 6.2) and shall not adversely affect the serviceability, appearance, and uniformity of the product.

4. VERIFICATION

4.1 Classification of inspections. The inspection requirements specified herein are classified as follows:

a. First article inspection (see 4.2).

b. Conformance inspection (see 4.3).

4.2 First article inspection. A first article inspection shall consist of the examinations and tests specified in 4.4.

The first article shall be rejected if any associated requirements are not met.

4.2.1 First article samples. The sample size will be specified in the procurement document (see 6.2). The sample unit shall be one pair of mitten liners and the lot size shall be expressed in pairs.

4.3 Conformance inspection. Conformance inspection shall include the examination specified in 4.3.1.

4.3.1 Conformance inspection samples. Sampling for conformance inspection shall be performed in accordance with ASQ/ANSI Z1.4 and with AQLs as specified in the contract or order (see 6.2). The sample unit shall be one pair of mitten liners and the lot size shall be expressed in pairs.

4.3.2 In-process examination. Visual and dimensional examinations shall be made at any point or during any phase of the manufacturing process to determine whether the construction details that cannot be easily examined in the finished product are in accordance with requirements specified in section 3. Materials and components that contain a defect in accordance with 4.4.1 shall be corrected or removed from production.

4.4 Component and end item inspection. In addition to testing provisions specified in reference documents, components shall be tested for the characteristics specified in this specification. Tests shall be conducted with both the specimen and test apparatus under standard conditions as defined in the various ASTM and AATCC test methods. All requirements are applicable to the sample unit. Test reports, when prescribed in the associated test method, evaluation procedure or other cited guidance, should contain the individual values utilized in expressing final results. The lot shall be rejected if one or more sample units fail to meet any test requirement specified.

4.4.1 End item visual examination. The mitten liner shall be visually examined for defects in shade, design, material, construction, and workmanship, with defects classified in accordance with table X. Defects shall not exceed the acceptance quality limit (AQL) specified in the contract or order (see 6.2).

TABLE X. Defects.

Examination Defect Major Minor

Mitten pairing Not matched and paired left and right, right and left not same size, wide variation in appearance

Not tacked or joined together as specified. 201

Design Not as specified (incorrect material, pattern, etc.) 102

Poorly shaped 202

Shade Shade variation within a part or between parts 103

Unacceptable shade change as a result of water repellent treatment application

Any color not as specified 105

Cleanness Spot, stain 203

Excessive thread ends not trimmed or removed 204

Shade stamp marking on outside 205

Odor, affecting appearance or serviceability 206

Material and workmanship

Any component part omitted, distorted, full, tight, or twisted 106

Not functioning properly or defective 107

Any part caught in any unrelated stitching 108

Cloth material:

Any hole, cut, tear, smash, burn, drill hole, run, thin place, dye streak, misweave or misknit, knot or slub affecting appearance or serviceability

Leather:

Not specified color 110

Not full grain 111

Flesh side not smooth or contains area of coarse, loose fibers

Not clean–stained, or foreign matter 207

Hard, boney, loose, spongy leather, hard scar 113

Cut or hole 114

Seam (defect affecting appearance or serviceability)

Not specified type 115

Puckered, distorted, pleated, wavy, twisted, irregular, or open

Loose or tight stitch tension, broken or missing thread or stitch

Needle cutting, needle chew, visible mend 118

Edge or raised stitching sewn too close to the edge resulting in damage to the cloth

Seam allowance not as specified 120

Visible raw edge 121

Any visible perforations from removed stitches 208

TABLE X. Defects – Continued.

Examination Defect Major Minor

Material and workmanship

(continued)

Poorly assembled and affecting serviceability 122

Difference in overall length between the front and back of the mitten liner is greater than 1/2 inch

Unwanted permanent fold, pleat, or crease in the fabric or mitten, affecting appearance or serviceability

Labels Omitted, incorrect, illegible, not attached where specified 209

Barcodes omitted, not readable by scanner 210

Human-readable interpretation omitted or illegible 211

Barcode not visible on folded, packaged item; barcode attachment causes damage to the item.

Packaging Not packaged in accordance with the contract or purchase order

(see 6.2)

4.4.2 Dimensional examination. The end item shall be examined for conformance to the dimensions specified in table VIII.

4.4.3 Component testing. The components (see 3.5.2 through 3.5.5) shall be tested for characteristics listed in table XI. The methods of test shall be as specified in table XI. The testing requirements and test sampling plan shall be as specified in the test method.

TABLE XI. Component tests.

Characteristic Requirement

Paragraph Test Method

Thickness Table I ASTM D1814

MVTR Table I ASTM D5052

Water absorption resistance Table I 4.5.1

Oil and stain resistance Table I AATCC TM118

Abrasion resistance Table I ASTM D7255

Stiffness Table I ASTM D2821

Stitch tear Table I ASTM D4705

Elongation at 25 pound load Table I ASTM D2209

Shrink temperature Table I ASTM D6076

Veslic rubbing abrasion 1/ Table I ISO 11640

Cold crack resistance Table I ASTM D1912

Finish adhesion Table I ASTM D6182

Flexibility and adhesion of finish at 30,000 cycles Table I ASTM D6182

Hexane soluble material 2/ Table I ASTM D3495

Chromic oxide 2/ Table I ASTM D2807 pH value Table I ASTM D2810

TABLE XI. Component tests – Continued.

Characteristic Requirement

Paragraph Test Method

Total ash 2/ Table I ASTM D2617

Determination of chromium (VI) content Table I ISO 17075-2

Weight Table II and table III ASTM D3776/D3776M

Air permeability Table II ASTM D737

Thickness Table II ASTM D1777

Fabric count Table II ASTM D3775

Puncture propagation Table II ASTM D2582

Abrasion Table II ASTM D3884

Hydrostatic pressure Table II AATCC TM127

Fiber content 3/ Table III AATCC TM20

Thickness Table III ASTM D1777

Grade 4/ Table III USDA United States Standards for

Grades of Wool

Burst strength Table III ASTM D6797

MVTR Table III ASTM E96/E96M, procedure B

Dimensional stability Table III AATCC TM135, 2, II, Aii

FOOTNOTES:

1/ Value shall be obtained using the AATCC EP1.

2/ Testing shall be conducted and result calculated on moisture-free basis.

3/ Testing shall be conducted on a scoured form.

4/ A certificate of compliance may be submitted to address the stated requirement (see 6.7).

4.4.4 End item testing. The finished liners shall be tested for the characteristics listed in table XII according to the specified methods. The testing requirement and test sampling plan shall be specified in 4.5.2.

TABLE XII. End item testing.

Characteristic Requirement Paragraph Verification

Clo (dry thermal insulation) value 3.7 4.5.2

4.5 Examinations and tests.

4.5.1 Water absorption resistance test. One 3-inch diameter specimen shall be tested from each 12-by-12-inch test area. Prior to testing, the specimen shall be allowed to reach moisture equilibrium in the standard atmospheric conditions environment, as specified in ASTM D1610. A stainless steel 500-milliliter, 3-inch diameter, 5-inch long container with a rubber gasket and cover shall be used to test the specimen. The specimen shall first be weighed (to the nearest 0.01 gram) and then shall be placed inside the cover with the flesh side of the specimen next to the inside of the cover. The rubber gasket shall then be placed inside the cover and against the grain surface of the leather specimen. One-hundred milliliters of distilled or deionized water at 23 °C shall then be added to the container. The cover with the specimen and gasket shall then be secured to the container. The container shall then be inverted so the water is against the grain surface of the specimen. The inverted container shall be placed on a flat surface and allowed to remain in the inverted position for 30 minutes. At the end of 30 minutes, the container shall be placed upright and the cover shall be removed and placed on a flat surface. The inside of the cover shall face the flat surface. The cover shall be tilted so the outer edge of the bottom is raised 1 to 1-1/2 inches from the flat surface and allowed to drain for 5 minutes. After 5 minutes, the specimen shall be removed from the cover, held by its edge, and shook briskly once to remove any free moisture from the surface of the specimen. The specimen shall be immediately reweighed to the nearest 0.01 gram; the percent water absorption shall be calculated as follows:

Percent water absorption = (W2 − W1) × 100

W1

Where:

W1 = Original weight of conditioned specimen

W2 = Weight of specimen after being subject to water

4.5.2 Thermal insulation test. Three separate samples of the mitten liners shall be evaluated in accordance with

ASTM F3426 and the average value is reported. Total thermal resistance (R) values can be converted to the more familiar clo unit, by multiplying the R value by 6.45, to allow ranking order of standard for procurement purposes.

Test size shall be right hand, size large. A life-sized biophysical model of the human hand that measures localized and total thermal resistance shall be used. Insulation values for the total hand model and its seven individual regions are calculated by an internal program during 30 minutes of steady state data collection. The ambient temperature shall be maintained at 5±0.5 °C and the surface of the hand model is controlled at 35 °C. The relative humidity shall be 50 percent and wind speed shall be maintained at 0.4 meters per second. Total thermal resistance (R) to heat exchange is calculated in the test conditions stated above and using:

R = (SA × delta T)

P

Where:

R is the thermal resistance, m2 °C/watt

SA = total surface area of seven regional segments, m2

Delta T = temperature gradient between the hand model surface and ambient air temperature, °C

P = Total power input, watts

If required (see 6.2), mitten liners submitted will be tested by the Government. Testing at alternate facilities shall require side-by-side comparison due to chamber wind speed differences that cannot be controlled that will affect the total measured values.

4.5.3 Visual shade matching. Shade shall be assessed using AATCC EP9, option C (see 6.5), with sources simulating artificial daylight D65 illuminant (see 6.5.1) with a color temperature of 6,500±200 Kelvin (K) illumination of 100±20 foot candles, and shall be a good approximation to the standard sample under incandescent

A illuminant with a color temperature of 2,856±200K.

4.5.4 Spectral reflectance test. Spectral reflectance data shall be obtained from 600 to 860 nanometers at

20-nanometer intervals on a spectrophotometer relative to the polytetrafluoroethylene family of compounds, the preferred white standard. Other white reference materials may be used provided they are calibrated to absolute white or vitrolite tiles. The spectral band width shall be less than 20 nanometers at 860 nanometers. Reflectance measurements shall be made by either the monochromatic or polychromatic mode of operation. When the polychromatic mode of operation is used, the spectrophotometer shall operate with the specimen diffusely illuminated with the full emission of a continuous source that simulates in the visible spectrum either International

Commission on Illumination (CIE) source A or CIE source D65. The specimen shall be viewed at an angle of no greater than 10 degrees from normal, with the specular component included. Measurements shall be taken on a minimum of two different areas and the data averaged. The specimen shall be measured as a single layer backed with three layers of the same fabric and shade. Specimens shall be oriented in different directions during testing.

When possible, the specimens tested shall not contain the same warp and filling yarns. The diameter for standard aperture size used in the color measurement device shall be the largest possible for each color. The measured areas should be at least 6 inches away from the selvage. Photometric accuracy of the spectrophotometer shall be within

1 percent and wavelength accuracy within 2 nanometers. Any color having spectral reflectance values falling outside the limits at four or more of the wavelengths specified shall be considered a test failure.

5. PACKAGING

5.1 Packaging. For acquisition purposes, the packaging requirements shall be as specified in the contract or order (see 6.2). When packaging of materiel is to be performed by DoD or in-house contractor personnel, these personnel need to contact the responsible packaging activity to ascertain packaging requirements. Packaging requirements are maintained by the Inventory Control Point’s packaging activities within the Military Service or

Defense Agency, or within the military service’s system commands. Packaging data retrieval is available from the managing Military Department’s or Defense Agency’s automated packaging files, CD-ROM products, or by contacting the responsible packaging activity.

6. NOTES

(This section contains information of a general or explanatory nature that may be helpful, but is not mandatory.)

6.1 Intended use. This item is intended for wear by military personnel of the Department of Defense during extreme cold weather conditions in combination with a full mitten shell or a trigger finger mitten shell conforming to types I and II of MIL-DTL-32707.

6.2 Acquisition requirements. Acquisition documents should specify the following:

a. Title, number, and date of this specification.

b. Sizes required (see 1.2).

c. The specific issue of individual documents referenced (see 2.2 and 2.3).

d. Applicable Government patterns, including revisions.

e. When first article sample is required (see 3.1.1, 4.2, and 6.3).

f. When conformance inspection is required (see 3.1.2).

g. AQLs (see 3.10, 4.2.1, and 4.4.1).

h. Number of first article inspection samples (see 4.2.1).

i. When the mitten liners require thermal insulation testing by the Government (see 4.5.2).

j. Packaging requirements (see 5.1).

6.3 First article. When first article inspection is required, the contracting officer should provide specific guidance to offerors whether the item(s) should be a first article sample, a first production item, or a standard production item from the contractor’s current inventory, and the number of items to be tested as specified in 4.2.

Invitations for bids should provide that the Government reserves the right to waive the requirement for samples for first article inspection to those bidders offering a product that has been previously acquired or tested by the

Government and that bidders offering such products, who wish to rely on such production or test, must furnish evidence with the bid that prior Government approval is presently appropriate for pending contract. Bidders should not alternate submit bids unless specifically requested to do so in the solicitation.

6.4 Standard sample. For standard samples, address the procuring activity issuing the invitation for bids or request for proposal.

6.5 Visual shade matching. In 2019, option A of AATCC EP 9 was changed to option C. NOTE: In case of confusion, the viewing geometry should be such that the specimen plane and illumination source are parallel to each other and aligned so that the light flux is incident at the center of the specimen plane, which is set at a 35±5-degree angle relative to the horizontal. The observer will view the specimens at a 90-degree angle, relative to the plane of the specimens.

6.5.1 Use of D75 illuminant. The use of D75 illuminant with a color temperature of 7,500±200K illumination of 100±20 foot candles in lieu of the specified D65 illuminant is permitted.

6.6 Sources of supply.

6.6.1 Basic shell material. 70 denier nylon ripstop (see 3.5.1) has been shown to meet the requirements of this specification. A known source of this material is:

Brookwood Companies, Inc.

485 Madison Avenue, Suite 500

New York, NY 10022

Phone: 212-551-0100

Fax: 646-472-0294 www.brookwoodcos.com

6.6.2 Grip, fingertips. Style #700554-700 (see 3.5.3) has been shown to meet the requirements of this specification. A known source of this material is:

SuperFabric

570 Hale Ave. N.

Oakdale, MN 55128

Phone: 651-730-6203 www.superfabric.com

6.6.3 Lining, inside cuff hem and trigger finger. 100 percent wool napped French terry, style # 2195-S

(see 3.5.4) has been shown to meet the requirements of this specification. A known source of this material is:

Draper Knitting Company

28 Draper Lane

Canton, MA 02021-1693

Phone: 1-800-808-7707 www.draperknitting.com

Source: http://assist.dla.mil -- Downloaded: 2023-05-02T18:22Z Check the source to verify that this is the current version before use.

http://www.brookwoodcos.com/ http://www.superfabric.com/ http://www.draperknitting.com/

6.6.4 Lining, front of hand, back of hand, and thumb. Napped wool lay-in, style #2162 (see 3.5.5) has been shown to meet the requirements of this specification. A known source of this material is:

Draper Knitting Company

28 Draper Lane

Canton, MA 02021-1693

Phone: 1-800-808-7707 www.draperknitting.com

6.6.5 Insulation. Known sources that meet the requirements of the material specified in 3.5.6 are 3M

(3M Thinsulate Insulation Type C), PrimaLoft (PrimaLoft Silver Insulation), and Climashield.

3M

3M Center

St. Paul, MN 55144-1000

Phone: 1-888-364-3577 www.3m.com

PrimaLoft

19 British American Blvd

Latham, NY 12110

Phone: 518-213-9073 www.primaloft.com

Climashield

641 Northpark Drive

Clinton, TN 37716

Phone: 865-463-6184

Fax: 865-463-6188 www.climashield.com

6.7 Certificates of compliance. A certificate of compliance may be acceptable for addressing selected test requirements at the discretion of the contracting agency. It is recommended that contractors submit a request to the contracting agency to obtain permission to use certificates of compliance before relying on their acceptance.

6.8 NSN information. The NSN for a representative sample of the mitten liners is provided below. This is not intended to be an exhaustive list.

Size NSN

Medium 8415-01-697-9022

6.9 Subject term (key word) listing.

Handwear

Leather

Nylon

Outer shell http://www.draperknitting.com/ http://www.3m.com/ http://www.primaloft.com/ http://www.climashield.com/

FIGURE 1. Back of hand view.

FIGURE 2. Palm view.

CONCLUDING MATERIAL

Custodians: Preparing activity:

Army – GL Navy – MC

Navy – MC (Project 8440-2022-001)

Review activities:

Army – AV, MI

Navy – AS, CG1, NU

Air Force – 11

DLA – CT

Civil agency:

GSA – FAS

NOTE: The activities listed above were interested in this document as of the date of this document. Since organizations and responsibilities can change, you should verify the currency of the information above using the

ASSIST Online database at https://assist.dla.mil.

https://assist.dla.mil/