GP-678 Hydrogen-Terminated Silicone Fluid

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GP-678 is a hydrogen- terminated dimethyl polysiloxane with a nominal viscosity of 20 cSt at 25° C. The structure of GP-678 is shown below where x =25.

The silicon-hydrogen groups of GP-678 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.

Typical Properties
Clear, Colorless Liquid
Weight/Gallon @ 25°C
8.0 lbs
Specific Gravity
Viscosity (cPs) @ 25°C
20 cP
Wt. % Silicone
Wt. % SiH
Molecular Weight (Calculated)
2000 amu
Refractive Index


The following are some of the suggested applications for GP-678:

  • Room Temperature Curing Silicone Rubber Component
  • Hydrophobic Treatment of Powders and Pigments
  • Water Proofing Agent for Textiles, Paper and Leather
  • ABA Type Silicone Block Copolymers

Processing and Safety Guidelines

GP-678 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-678, and must be avoided. GP-678 may cause skin irritation. Consult Safety Data Sheet for additional safety information.


GP-678 is supplied in 5-gallon (40 lb.) pails, 55-gallon (440 lbs.) drums and 330-gallon (2640 lbs.) totes.