GP-905 Silicone Polyol Copolymer

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GP-905 is a 100% active polypropylene oxide (PO) modified dimethylpolysiloxane block copolymer which is designed to improve the quality and performance of solvent-based, baked-on industrial finishes. The combination of polysiloxane and polypropylene oxide segments provides excellent lubricity and low surface tension which improves wetting, leveling and flow of solvent-based coatings. GP-905 contains Si-O-C bonds between silicone and polyol blocks and may be affected by hydrolysis in some aqueous systems. Some of the special properties of GP-905 are listed below:

  • Low Surface Tension
  • Excellent Lubricity
  • Thermal Stability 
Typical Properties
Clear to Hazy, Colorless to Light Amber Liquid
Weight/Gallon @ 25°C
8.0 lbs
Viscosity (cPs) @ 25°C
465 cP
Flash Point (P.M.C.C.)
Specific Gravity
Wt. % Active
Wt. % Silicone
Molecular Weight (Calculated)
5200 amu
Polyol Type
Polyoxypropylene (PO)
Aliphatic Hydrocarbon Solvents
Aromatic Hydrocarbon Solvents
Chlorinated Hydrocarbons
Solubility in Water


In addition to a coating additive, GP-905 is also recommended for evaluation in polyurethane foam systems - as a profoamer additive. Other applications include textile and thread lubricants, internal lubricant for plastics and base material for aqueous defoaming agents. Other applications include the following:

  • Thread Lubricant
  • Pigment Dispersant
  • Wetting Agent-Solvent Systems
  • Leveling & Flow Control Agent-Solvent Coatings
  • Urethane Bubble Release Additive (Coatings)
  • Release Agent
  • Antifoam - Aqueous Systems
  • Polyurethane Foam Additive (Profoamer)

Processing and Safety Guidelines

GP-905 has been formulated to be compatible with solvent based coatings and adhesives. GP-905 has a very low order of toxicity, but should still be handled with all precautions common to the use of any industrial chemical product. Consult Safety Data Sheet for additional details.


GP-905 is supplied in 5-gallon (40 lbs.) pails, 55-gallon (440 lbs.) drums and 330-gallon (2640 lbs.) totes.  Moisture Sensitive. Keep containers tightly sealed. Store below 100° F.