LA-CO Bloc-It Heat Absorbing Pastes Effectively absorbs surface heat. Protects adjoining surfaces that may be damaged by excessive heat. Safe to use: non-toxic, no asbestos, harmless to skin, and odorless. Easy to clean: wipe off with cloth or wash with water. Typical uses: protects rubber and plastic components in ball, dielectric, and solenoid valves during soldering Pack of 1