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Circular Cross-Section They are circular in shape, round in cross-section. Designed for use in a wide variety of sealing applications. Commonly provide a pressure and fluid seal between cylindrically shaped, overlapping mating surfaces and are commonly seen in engines, faucets, flanges, valves, and various cylinders. Silicone Rubber O-Ring Noted for their ability to be used over a wide temperature range and for excellent resistance to ozone, weathering, and aging. Standard silicones are resistant to water (to 100°C), aliphatic engine and transmission oils and animal and plant oils, and fats. Silicones are generally not resistant to fuels, aromatic mineral oils, steam (short term to 120°C is possible), silicone oils and greases, acids, or alkalis.