Self-sealing - Excellent Strength - Excellent Puncture Target Area - 40% greater than standard septa Upper Heat limit - 85°C Extractables (Hexanes) - 1.9% Volatile Matter - 0.19% Ash Content - 0.24% Rubber composition: Standard rubber no. 1, accelerator, oxidizer, hard resin acid, anti-ager, lime carbonate, dye agent.