ShinEtsu KS-650N is a specialty silicone oil compound developed for direct contact with silicone rubber components where dimensional stability and material compatibility are required. During use, it delivers a smooth, controlled feel with consistent wetting behavior on rubber surfaces, supporting stable assembly and long-term service performance. The material spreads evenly, remains visually uniform after application, and supports reliable handling during both initial installation and ongoing operation without introducing unwanted surface changes.

• Anti-Swelling Control - KS-650N is formulated as an anti-swelling silicone oil compound that limits volume expansion of silicone rubber when exposed to oils or automotive fluids. With a kinematic viscosity of approximately 350 mm²/s at 25 °C, the compound forms a controlled lubricating film that reduces solvent penetration into elastomer networks, helping maintain original seal geometry over extended service periods.

  
  

• Material Compatibility - The silicone oil structure is optimized for compatibility with silicone rubber, reducing extractables and migration. A specific gravity of approximately 0.97 at 25 °C supports stable interfacial behavior without excessive loading on rubber components, maintaining consistent contact pressure in sealing systems.

  
  

• Chemical Resistance - KS-650N provides resistance to common automotive oils, fuels, and hydraulic fluids. Its refractive index of approximately 1.404 at 25 °C reflects a stable molecular structure that supports chemical durability, reducing degradation risks during prolonged fluid exposure.

  
  

• Stable Viscosity - The viscosity profile remains consistent across typical operating temperatures encountered in industrial and automotive environments. This stability supports predictable film thickness and uniform distribution, contributing to repeatable performance during assembly and maintenance processes.

  
  

• Seal Integrity - By limiting swelling and surface softening, KS-650N supports long-term seal integrity. Controlled oil absorption behavior helps maintain compression set performance and reduces leakage risk in dynamic and static sealing applications.

  
  

• Electrical Insulation - The silicone oil compound maintains good dielectric behavior while in contact with rubber components. Stable density and uniform composition support consistent insulation performance where rubber seals are used near electrical or electro-mechanical interfaces.

• Rubber Gaskets - KS-650N is used on silicone rubber gaskets to control swelling and maintain dimensional accuracy. Its viscosity supports even coating on gasket surfaces, contributing to stable sealing force during long-term service in fluid-contact environments.

  
  

• Automotive Seals - In automotive sealing systems, the compound supports resistance to oils and fuels commonly encountered in engines and drivetrains. Controlled absorption behavior helps preserve seal shape and reduces performance variation over extended mileage.

  
  

• Industrial Rubber Parts - KS-650N is applied to industrial rubber components exposed to lubricants or process fluids. Stable chemical properties support consistent operation in equipment requiring long service intervals and reduced maintenance.

  
  

• Hydraulic Systems - The material is used on silicone rubber seals in hydraulic systems to reduce swelling caused by hydraulic fluids. Its density and viscosity characteristics support predictable seal behavior under pressure cycling.

  
  

• Fuel System Protection - In fuel system components, KS-650N helps protect silicone rubber parts from chemical interaction with fuels. This supports longer component life and stable sealing performance under fluctuating temperature conditions.

  
  

• Electrical Rubber Seals - KS-650N is suitable for silicone rubber seals used in electrically adjacent assemblies. Its stable composition supports insulation reliability while maintaining mechanical integrity of rubber interfaces.