GP-535 1,1,3,3 Tetramethyldisiloxane

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GP-535 (1,1,3,3 Tetramethyldisiloxane is a hydrogen terminated siloxane dimer with the above structure.

Typical Properties
Clear, Colorless Liquid
Weight/Gallon @ 25°C
6.3 lbs
Viscosity (cPs) @ 25°C
0.55 cP
Flash Point (P.M.C.C.)
10° F
Specific Gravity
Molecular Weight (Calculated)
134.33 amu
Refractive Index


The Silicon Hydride groups of GP-535 provide a reactive site, allowing reaction with a variety of materials containing vinyl groups or with hydroxyl functional polysiloxanes in combination with heat or metal catalysts.  Other applications include:

  • Room Temperature Curing Silicone rubber Component
  • Cross-linking Agent for Vinyl Cured Silicones
  • Water Proofing Agent for Textiles, Paper and Leather
  • End-Blocker for Silicone Fluid Synthesis

Processing and Safety Guidelines

GP-535 reacts with water, alcohols or other reactive hydrogen compounds, to liberate hydrogen gas.  Since the hydrogen is Flammable and also will cause pressure build-up in closed containers, use all proper precautions when handling these products. 

Alkaline materials will cause a rapid release of hydrogen, when in contact with GP-535, and must be avoided.

GP-535 is a flammable liquid and may cause skin irritation.  Consult Safety Data Sheet for additional safety information.


GP-535 (1,1,3,3 Tetramethyldisiloxane) is supplied in  5-gallon (25.3 lbs.) pails and  55-gallon (330 lbs.) drums.