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Viton, also known as Fluorocarbon rubber (FKM), is a high-performance rubber that has excellent resistance to high temperature, ozone, weather, oxygen, mineral oil, fuels, hydraulic fluids, aromatics and many organic solvents and chemicals. The 75A Durometer Viton (FKM) o-ring has a round cross-section and can be used across a wide temperature range (-26°C/-15°F to 232°C/450°F). The durometer hardness of this Brown Viton o-ring is 75A. Mr O-Ring has all your 75A durometer Viton o-ring needs covered with our extensive AS568 size range. We also offer in multiple pack sizes to meet your demand.