2.5mm Thick, Round Cross Section, Shore 70 - 80, -15 to 400°F Round cross-section shapes can be used in both static and dynamic applications. They are used as a mechanical seal or gasket and are seated in a groove and compressed during assembly between two or more parts.|Viton is a highly corrosion-resistant material used against petroleum fluids, diester lubricants, silicone fluids, phosphate esters, solvents and acids except for fuming nitric acids. It is especially good for hard vacuum services and low gas permeability. Not for use with acetates, ketones, methyl alcohol, brake fluids, hot water or steam.