Expanded silicone sponge is available in a range of colors and densities to include sheet extruded sections, cord, tubing and gaskets, all with a tear resistant skin and able to with stand heavy loading. Not giving off toxic fumes in the event of fire and also available with UL 94VO fire retardant rating. The material has a fine closed cell structure encapsulated by a smooth and resilient outer skin to give a low degree of moisture absorbance and offers a wide continuous service temperature range of - 50 degree celsius to + 200 degree celsius sheet, gaskets and extruded profiles can be supplied with a pressure sensitive adhesive backing and cord can be joined to form continuous seals.