Silicone Solid Sponge Profiles & Gaskets.They Are Autoclavable And Food Grade. Hardness of Solid SiliconeGasket is 14 shore A to 80 shore A.It Easily Withstands Temperature Range of-80 C to 260CThese Gasket Are Avaiblable In Square, Rectangular, Circular, Oval or Any Section As Desired By Customer.