A-A-52408 Preservative Coating, Rubber : For Rubber SurfacesThis CID covers preservative coating for the protection of natural or synthetic rubber items such as tires, track pads, bogey wheels, gaskets, hoses, and others. Its purpose is to eliminate deterioration due to oxidation, ultraviolet light and ozone. The material can be used where solvent vapor is not a hazard.

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A-A-52408

d. Viscosity. The viscosity shall be such that the preservative shall pass through a number 4 Ford cup in not more than 60 seconds when tested in accordance with American Society for Testing and Materials (ASTM) D1200.

e. Dry time. Applied preservative shall be dry to the touch in no more than 60 minutes, when touched with clean white laboratory filter paper for no less than 5 seconds. The paper shall show no indication of wetting or discoloration.

f. Accelerated storage. The preservative shall be free from gelation, hard caking, separation, or other visible signs of deterioration or nonconformance after storage for 28 days in typical storage containers at both 120° ± 5°F and 20° ± 5°F. The preservative shall then conform to SC b through e.

g. Discoloration. The discoloration of the natural or synthetic rubber products treated with the preservative shall be kept to a minimum.

h. Ozone resistance. Five preserved type A test specimens shall be free of cracks and crazing when examined under 7-power magnification after 25% elongation and exposure to an air and ozone mixture of 50 ± 5 parts ozone per one hundred million (pphm) of air by volume for 200 ± 1 hours, or 100 ± 10 pphm of ozone for 100 ± 1 hours, at 104 ± 2°F in accordance with ASTM D 1149.

i. Penetration and retention of preservative. The average minimum increase in weight for five preserved test specimens shall be at least 2% of the weight of the five test specimens prior to preservation, when weighed 24 ± 1 hour after preservation to the nearest .0001 gram. Test specimens shall be 3 x 1 inches.

j. Unit container sizes. The preservative shall be available in the following unit container sizes: pints, gallons, 5 gallon pails, and 55 gallon drums (see note b and c).

k. Material safety data sheet (MSDS). A MSDS shall be prepared in accordance with the latest revision of FED-STD-313 (see note b and f).

l. Identification and markings. Each unit container (see SC j) shall be marked in accordance with MIL-STD-129 and shall include as a minimum the manufacturer’s name, the date of manufacture, and CID PIN (see note c).

m. Test specimens. Test specimens shall conform to the composition shown in table I. Rubber test specimens shall be cured into sheets 0.075 inch in thickness under a minimum pressure of 500 psi at a temperature of 307°f for 30 minutes. Unless otherwise specified (see note b), test specimens shall be thoroughly cleaned of all contaminants and preservative applied by hand brushing until completely treated or saturated.

TABLE II. Rubber test specimen composition.