Molykote 55 is a silicone-based grease designed to lubricate and seal rubber O-rings and assemblies where rubber and metal surfaces interact. It spreads smoothly, forms a uniform film and slightly swells many elastomers in a controlled manner, helping users achieve a tighter and more reliable seal. This product is heat-stable and oxidation-resistant.

• Enhanced Sealing - Molykote 55 improves O-ring sealing by providing a stable lubricating layer that maintains uniform contact pressure between rubber and metal components. Testing shows reduced installation friction and fewer surface defects on elastomers, allowing the seal to deform consistently under load. 

  
  

• Wide Temperature Range - With a service range from minus sixty-five to one hundred seventy-five degrees Celsius, the grease remains workable across extreme cold and high heat. This allows equipment operating in varied climates to rely on a single lubricant, reducing the need for seasonal changes. Systems exposed to rapid temperature fluctuation benefit from consistent friction behaviour and reduced start-up resistance.

  
  

• Oxidation Resistance - Molykote 55 resists degradation when exposed to heat and oxygen, supported by ageing tests that show minimal change in viscosity and hardness compared with mineral-based greases. This limits the formation of oxidative residues that can restrict O-ring movement or cause sealing surfaces to become brittle. 

  
  

• Water Resistance - The silicone matrix withstands humidity, splashes and intermittent water exposure without significant washout. Water-spray and immersion tests demonstrate low mass loss, showing that the grease adheres effectively to rubber and metal surfaces. This helps seals keep their lubricating film even when exposed to moisture, preventing dry friction and reducing corrosion on metal housings. 

  
  

• Material Compatibility - Compatibility tests with common elastomers and plastics show limited changes in hardness and volume, making the grease suitable for assemblies containing mixed materials. Nitrile rubber, fluorocarbon rubber and silicone rubber exhibit stable properties when used with Molykote 55 within the recommended temperature range. 

  
  

• Low Volatility - Evaporation-loss measurements near high-temperature limits show that Molykote 55 retains its base oil effectively, keeping the lubricant film from drying out. Low volatility reduces the rate at which lubricating components escape from the grease, supporting long-term sealing performance in semi-sealed or enclosed systems.

• Aerospace - Molykote 55 is used to lubricate and seal O-rings in aircraft actuators, hydraulic units and environmental control components. These systems face temperature extremes between cold-soak conditions and high-temperature service zones. The grease helps maintain elasticity in O-rings and preserves a stable film that supports long maintenance intervals. 

  
  

• Automotive - The grease is applied to O-rings in brake boosters, fuel connectors and under-hood control components exposed to vibration, moisture and thermal cycling. It reduces installation damage by lowering friction and helps maintain sealing effectiveness despite exposure to road spray and engine-bay heat. Its compatibility with common automotive elastomers supports long-term durability, allowing components to remain leak-free through repeated temperature swings.

  
  

• Industrial Equipment - In factory machinery, Molykote 55 is used in pneumatic cylinders, valves and regulators where metal-rubber interfaces must remain lubricated. Continuous-operation environments benefit from its oxidation stability and moisture resistance, which help prevent sticking and surface wear. Its wide temperature capability also allows the same product to support equipment installed in different thermal zones, improving maintenance consistency.

  
  

• Consumer Appliances - The grease supports smooth operation of pumps, dispensers and control cartridges found in home and commercial appliances. It reduces assembly force on production lines and maintains low friction during repeated actuation cycles. Its moisture resistance helps seals last longer when exposed to cleaning fluids or humid operating conditions, supporting long-term reliability and reducing service requirements.