A-A-52443 Lubricant, Mold, Tire, Silicone Base Emulsion (Metric)This CID covers one type of silicone-base tire-mold lubricant furnished as a concentrated emulsion for further dilution with 100 or more parts of water. It is furnished in metal containers (with metal screw-top caps) of various sizes (see 2.8). The solution is used for spraying (or otherwise coating) tire molds, recapping or retread molds, tube plates, and the like. When applied, the solution will form a thin, inert film to prevent adhesion of "rubber stocks" and will assure a good surface finish of the cured compound.

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A-A-52443A(AT)

2 2.2 Color. Color of the tire mold lubricant shall, unless otherwise specified, be the “milk white” characteristic of water emulsions made from white or colorless ingredients. The color of the lubricant shall not change objectionably at any temperature below 177°C.

2.3 Stability. Undiluted lubricant shall show no creaming within 30 days storage and no phase separation within one year storage. Any creaming after 30 days storage shall redispurse readily by gently shaking or stirring the lubricant. Lubricant diluted to a 70 to 1 ratio with relatively “soft” water shall show no more than slight creaming within 72 hours and no phase separation (oil separation) within two weeks. Lubricant diluted to a 70 to 1 ratio with relatively “hard” water shall show no phase separation within 24 hours and no more than a trace of creaming. When lubricant is diluted with either soft or hard water, creaming shall redisperse readily and gentle shaking or stirring shall restore a smooth homogenous lubricant. For purposes of lubricant dilution, water designated as relatively soft shall contain less than 50 parts per million (ppm) of solids. Water designated as relatively hard shall contain approximately 200 ppm of solids.

2.4 Temperature effects. Undiluted lubricant in sealed containers when subjected to low and high temperatures shall show no evidence of discoloration oil separation, creaming in excess of that permitted under 2.3, or other changes in consistency or appearance after being subjected to the following thermal effects, or equivalent procedure:

a. For low temperature. Subject a 50 milliliter (ml) sample of undiluted lubricant in a sealed container to five thermal cycles. Each cycle shall consist of exposing the sample to a low temperature of minus (-) 40°C (minimum) for at least one hour and gradually warming the sample until it reaches a stabilized temperature at 25 + 4°C.

b. For high temperature. Subject a 50 ml sample of undiluted lubricant in a sealed container to a high temperature of 65.5 + 3°C for at least 24 hours. Allow the sample to gradually cool in still air until the sample stabilizes at 25 + 4°C.

2.5 Alkalinity. The alkalinity of the undiluted lubricant shall be between 7.5 and 9.5 ph (potential hydrogen content) at room temperature and at 93.5°C. This shall be determined by subjecting the sample used in 2.5b (high temperature) to appropriate chemical tests for ph content.

2.6 Odor. When diluted for mold application, the lubricant shall have no objectionable odor when applied to a hot mold.

2.7 Inertness. The tire mold lubricant, diluted or undiluted, shall not affect, or be affected by, the metal containers and mixing or spraying equipment. The lubricant shall show no carbonizing build-up, corrosion, or other unfavorable affect on smooth aluminum, ferrous alloy molds, or compounded rubber stocks when sprayed, brushed, or swabbed onto mold surfaces at any temperature below 177°C (see 5.4 and 5.5).