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FDA approved Silicone O-rings are used in Food and Medical Industry Equipment and any other applications that require Food Grade or high heat applications. Silicone O-rings 70 Durometer are heat resistant up to 400*F and 450* intermittent to -75*F. Typically used in applications with engine and transmission oil, animal an vegetable oil and grease, Brake fluid (non petroleum base), fire resistant hydraulic fluid, moderately water resistant and diluted salt solutions.