GENUINE DOW CORNING MOLYKOTE 55 O-Ring Grease, NLGI #2 Consistency, Off-White Color. Molykote 55 O-ring Grease is a silicone-based material and contains an additive that helps ensure positive lubrication and sealing by slightly swelling rubber O-rings and seals. This product is heat stable and oxidation resistant and is serviceable from approximately -65 to 175°C (-85 to 347°F). It is recommended for dynamic lubrication between rubber and metal parts in pneumatic systems in aircraft, automotive and general industrial applications. Also used in certain paintball marker applications.