A-A-52518
3.5 Repair fabric and patches. Type III. Type III materials shall meet the requirements specified herein and be furnished as specified in table III.
3.5.1 Repair fabric (class A). Tire repair fabric shall be coated on both sides with cushion rubber gum meeting the requirements of table I. type I. class B of this CID. The coating shall be approximately equal on each side and shall be from 0.127 to 0.254 mm in thickness. The minimum fabric tensile strength shall be not less than 340 kg in 25.4 mm of width.
3.5.2 Tire repair patches. Pneumatic tire patches shall be furnished in the uncured (UC) (see A-A-00 A158/1) or semicured (SC) condition. The minimum fabric tensile strength for each ply shall be not less than 340 kg in 25.4 mm of width. All patches shall have gum stripping of 0.76 mm conforming to type I, class B.
3.5.2.1 Patch facing. Facing for each complete pneumatic tire repair patch or unit of a multiple unit patch shall be of cushion rubber gum meeting the requirements of type I, class B.
3.5.3 Patch, plug, unit, chemical cure. Plug patch units shall consist of a prevulcanized shank and prevulcanized patch molded together into one integral unit. Each unit shall be coated entirely with an uncured chemical face gum and, upon application of its corresponding vulcanizing fluid, shall cure simultaneously with item to be repaired at room temperatures of 21°C.
3.5.4 Storage life. Tire repair patch plug units and their corresponding vulcanizing fluids shall maintain their quality and meet their intended requirements for a minimum of 2 years after date of manufacture.
3.5.5 Marking. Each patch shall be so marked to assure proper installation. Markings shall include, where applicable, direction of cord, cord material. ply rating, and size.
3.5.6 Patch construction and identification. Construction and identification shall be as specified in table V.
3.6 Processing materials Type IV. Processing materials shall meet the requirements specified herein and be furnished as specified in table III.
3.6.1 Vulcanizing cement class A. Vulcanizing cement shall be capable of developing a cured adhesion of at least 54.4 kg per 25.4 mm and shall not contain reclaimed rubber. It shall not gel, nor precipitate when diluted with rubber solvent, and shall conform to the physical and mechanical properties of table VI.
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