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

2.3 Performance, type I and II.

2.3.1 Physical properties. Each patch unit shall have a tensile strength of not less than 13790 kiloPascal (kPa) and an elongation of not less than 600%. Prior to the tensile exposure, type I patch units shall be cured for 8 minutes at 143°C. Type II patch units shall in addition have tensile stress at 200% elongation of not less than 1550 kPa. The durometer shore hardness shall range from 45 to 60, type AZ shore durometer.

2.3.2 Adhesion. The minimum tensile strength required to cause separation between patch and inner tube, or between patch and inner liner of tire, shall be not less than 2.3 kilogram (kg) per

25.4 mm.

2.3.3 Endurance. Each patch unit of applicable type shall be exposed to, and complete, not less than 8050 kilometers at a temperature of 38 ± 3°C.

2.3.4 Storage life. Type I materials shall show no evidence of self-vulcanization after a period of 24 months from date of manufacture. Type II materials shall show no evidence of self-vulcanization after a period of 36 months from date of manufacture.

2.4 Instructions. Complete instructions for the application and use of patch units for both tubeless tires and inner tubes shall be furnished and legibly marked on wrappers, envelopes, containers or tags attached thereto.

2.5 Identification markings. Identification markings shall be placed on the outside of the sealing compound container and shall be permanent and legible and shall include, as a minimum, the manufacturer’s identification code (CAGE), the contract number, the part or identification number (PIN) (see 5.3), and the national stock number (NSN).

3. QUALITY ASSURANCE PROVISIONS

3.1 Responsibility for inspections. The contractor is responsible for the performance of all inspections (examinations and tests).

3.2 Contractor certification. The contractor shall certify and maintain substantiating evidence that the product offered meets the salient characteristics of this CID and that the product conforms to the producer’s own drawings, specifications, workmanship standards, and quality assurance practices. Items with known defects shall not be submitted for Government acceptance. The Government reserves the right to require proof of such conformance prior to the first delivery and thereafter as may be otherwise provided for under the provisions of the contract.