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Dow Corning 4 was the 'orininal' silicone grease in the 1940s, and the first application was protecting ignition systems on military aircraft. There was a version called 4X marketed specifically for the automotive market in the '70s, intended for both dielectric applications and lubricating rubber products and seals, such as brake cylinder seals and cups. The physical appearance of DC 4, DC 111, and DC 112 is identical, though 112 has a heavier consistency, and stays in place better at high temperatures. DC 4 is marketed for dielectric applications.DC 111 and DC 112 are both intended for valve packing lubricants and O-rings. DC 4 and DC 111 share the same data sheet and specifications,
along with DC 7, a mold release compound.
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Warren Hall
1973 911S Targa
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