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Description
GP-421 is an emulsion of a reactive, further curable silicone resin in water carrier (GP-422). Heating substrates treated with GP-421 will accelerate cure of the resin component of GP-421, with the following schedule determined for aluminum substrates:
|
Substrate Temperature
|
Cure Time
|
|
150°C (302°F)
|
8 Hrs.
|
|
175°C (347°F)
|
3 Hrs.
|
|
200°C (392°F)
|
1 Hr.
|
Cure times at various temperatures will be reduced on substrates such as masonry, because of the alkaline nature of masonry, which helps catalyze the resin curing reaction.
| Typical Properties | |
|---|---|
| Appearance |
White, Opaque Liquid
|
| Weight/Gallon @ 25°C |
8.0 lbs
|
| Flash Point (P.M.C.C.) |
200°F
|
| Specific Gravity |
1.02
|
| Solids Content |
42%
|
| Diluent |
Water
|
| Solvent Content |
15%
|
| pH |
6.0
|
| Silicone Resin Content |
36%
|
Applications
GP-421 may be applied to porous substrates such as wood, leather, textiles or masonry to impart water repellency properties - blocking penetration of liquid water, while still allowing moisture in the vapor phase to pass through. GP-421 may be used as a component in paints or coatings intended primarily for exterior applications, where the silicone resin component will improve weathering resistance and allow moisture transfer. Some more specific applications are listed below:
- Latex Paint Additive (Improved Weathering)
- Binder in High Temperature Paints
- Aqueous Adhesive Formulations
Processing and Safety Guidelines
GP-421 should be mixed prior to use to insure homogeneity. Refer to Safety Data Sheet for safety requirements.
Packaging/Handling/Storage
GP-421 is supplied in 5-gallon (40 lbs.) pails, 55-gallon (440 lbs.) drums and 330-gallon (2640 lbs.) totes. Keep container tightly sealed. Do not freeze. Do not store above 100° F.