Pemko SiliconSeal Adhesive-Backed Fire/Smoke Gasketing, Dark Brown Silicone, 0.5" W x 0.25" H x 18' L SiliconSeal is extruded from high-temperature silicone; effective between -58F and 450F. Seal begins compressing at 1/4"; Compresses to seal up to a 1/16" gap. Self-extinguishing and non-toxic; Unaffected by sunlight, ozone and ultraviolet rays. Impervious to fungus and mildew; will not deteriorate under normal exposure. Meets FAR 25.853 Airworthiness Standards for Compartment Interiors.