A-A-52517 Patch, Repair, For Inner Tubes And Tubeless Tire Liners (Metric)This CID covers hot self-vulcanizing chemical units; chemical vulcanizing patch unit kits, and fluids for repairing robber inner tubes of pneumatic tires and tubeless pneumatic tire liners. The patch units are used in repairing injuries caused by penetrating objects up to and including 3.2 millimeters (mm) in diameter in tubeless tires and injuries up to 19.1 mm in length (tears) in inner tubes.

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A-A-52517

2.2.2.1.1 Sectional characteristics. The cross sectional view of a molded round patch shall be a spherical segment. The cross sectional views of an oval molded patch shall have a spherical segment across the narrow width with a thin rectangular section view consisting of spherical segment ends across the long length.

2.2.2.2 Vulcanizing fluid. The fluid shall be capable of curing the face gum on chemically curable patches at room temperatures of 21°C, promote excellent initial adhesion to all types of tires and tubes, and shall exhibit no evidence of coagulation at temperatures of -51 to 52°C. It shall be capable of withstanding an accelerated shelf storage temperature of 52°C for six months and temperatures up to 38°C for a minimum of three years in sealed containers.

2.2.2.3 Cleaning solvent (rubber buffer). The solvent shall be capable of removing any foreign material from rubber products as an aid to manual or mechanical buffing prior to repair. It shall dissipate within 5 minutes upon application, and have a flash point of 38°C or more in accordance with the Tag Closed method of ASTM D56. In addition, it shall be capable of withstanding shelf storage temperatures of 520 C for 6 months, and temperatures up to 38°C for a minimum of 3 years in sealed containers.