A-A-50371B
3. SALIENT CHARACTERISTICS.
3.1 Description. The firemen's boots shall have a three-quarter length and a knee (bunker) length standard vulcanized construction. The boots shall have a steel box toe, spike-resistant insole, calendered or molded slip resistant lug outsole and heel, and a shin reinforcement. The Type I boots shall be fitted with a horizontal top strap and buckle assembly, and the Type II boots shall have pull-on leg loops (see (Figure 1). The boots shall meet the requirements of "National Fire Protection Association (NFPA) 1971 Standard Protective Ensemble for Structural Fire Fighting
1997 Edition", except for paragraph 1-3 - Definitions, 3-4.1.6 - Product Label Requirements, and
4-4.8, Protective Footwear Sizing shall not apply for the Type I boot.
3.2 Materials
3.2.1 Upper compounds. The rubber compounds used on the boots shall be natural, synthetic, or a blend of both. The upper part of the boot shall be black with white or yellow bumper toe caps and foxing. The tensile strength of the upper compounds shall be not less than 1100 pounds per square inch (psi) as specified in American Society for Testing and Materials (ASTM) Method D-412. The ultimate elongation of the upper compounds shall be not less than 350 percent when tested as specified in ASTM-D-412. After aging, the tensile strength and ultimate elongation shall each be not less than 75 percent of the original minimum required.
3.2.1.1 Aging. The test specimen shall be aged in accordance with ASTM-D-412 for 16 hours at
212 degrees F (+ 2 degrees F).
3.2.2 Sole and heel compounds. The abrasive index of the sole and heel shall be not less than 45 before aging as specified in ASTM-D-1630. After aging the abrasive index shall be not less than
75 percent of the original minimum required. The hardness of the sole and heel compounds shall be 64 (+ 5) before aging as specified in ASTM-D-2240. After aging the hardness shall be not more than 75 percent of the original minimum required.
3.2.3 Linings
3.2.3.1 Leg and top lining material. The leg and top linings shall consist of a para-aramid/aramid blend containing 35 to 50 percent para-aramid. The remaining percentage shall be aramid with the following characteristics:
Weight (minimum) 5.5 oz./sq. yd. Warp (gauge, minimum) 11 per inch Weft (stitches, minimum) 14 per inch
3.2.3.2 Alternate leg and top lining material. The alternate lining material for the leg and
top shall be a blend of 35 to 50 percent para-aramid with the remaining percentage aramid.
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