Also Known as Polysiloxane, This Silicone Rubber Offers Good Resistance to a Wide Variety of Chemicals. Softer Durometer Rubber Has Better Conformability; at 50A Durometer This Silicone Rubber is Medium to Soft and Conformable. Smooth Finish, No Adhesive Backing. Includes 1 Sheet of Semi-Clear Silicone Rubber .032 Inch Thick, 9"x 12" (.8mm x 230mm x 305mm). Made of FDA-Listed Materials for Use with Food and Beverage, 21 CFR 177.2600 / FDA Compliant, 3A 18-03 Class 1 (Sanitary Standard). Advantages of Silicone Rubber:450F Use Temperature, Makes a Great Non-Stick Surface, Resists Oil, Acids, Animal Fats, Vinegar, Acetone, Amonium Hydroxide, and Natural Gas. Not Recommended for Gasoline, Fuel Oil, Kerosene, or Toluene.