A-A-50063B
2.3 Rubber/cotton parts. The cotton cloth shall be either woven or knitted and shall be frictioned, calendar coated, or spread and calendar coated with rubber compound as necessary to prepare the parts such as leg linings, toe linings, vamp forms , and reinforcement strips necessary to build a boot.
2.4 Rubber parts. The rubber parts shall be made from upper compound or outsole and heel compound. The leg cover rubber shall be calendered from upper compound and shall be a minimum of 0.025 inch thick. Other gum rubber upper parts such as vamp, counter, and reinforcement strips shall be of appropriate thickness for the intended use. The outsole shall be cleated or heavily knurled and shall be a minimum of 0.285 inch at the ball. The heel shall be a minimum of 9/16 inch at the thinnest part and shall carry the manufacturer’s standard tread design. The rubber parts shall conform to the following requirements:
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Compound |
Characteristic |
Requirement |
Test method (ASTM) |
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Upper compound |
Tensile strength: |
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|
- initial |
1000 psi (rein |
D 412 |
|
- after aging (7 days at 158°F)` |
At least 75 percent of initial tensile strength |
D 573 and D 412 |
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Elongation: |
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|
- initial |
375 percent (rein) |
D 412 |
|
|
- after aging (7 days at 158°F) |
At least 75 percent of initial elongation |
D 573 and D 412 |
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|
Ozone resistance (bent loop - 3 days, 50 pphm at 104°F) |
No cracks visible to the unaided eye |
D 518 Procedure B D 1149 |
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Outsole and heel compound |
Abrasive index (before and after aging - 7 days at 158°F) |
35 |
D 1630 |
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Hardness (before and after aging) |
60 + 10 |
D 2240 |
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2.5 Top strap assembly (type II). The strap shall be either a double cotton cloth frictioned on both sides and coated with upper compound or a rubber strap not less than 0.090 inch thick. The strap shall be not less than 9–1/2 inches long and 5/8 inch wide. The loop at the top of the strap shall be large enough to permit easy .passage and secure holding over a 2-inch belt. The strap buckle shall be made of brass, aluminum, or steel, and shall be of the slide type suitable for the intended purpose. Brass buckles shall be nickel plated; aluminum buckles shall be anodized with a coat of black enamel; and steel buckles shall be either nickel plated or have baked enamel finish. The strap slot shall be not less than 5/8 inch wide and the stay slot shall be not less than 7/16 inch wide.
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