Lubricates - insulates - protects. Lumonite Silicone Grease - Care for your torch. The only correct chemical for the maintenance of light O-rings and threads. The only correct chemical for the maintenance of light O-rings and threads. Keeps rubber surfaces soft and threads slippery. Insulates from moisture. Excellent heat resistance. Does not adversely affect rubber or plastic. Colorless. We recommend this agent for the maintenance of all flashlights, headlamps and diving lights. Note! Clean the treated area carefully before greasing.