Poly GlassRub 50 Liquid Rubber


Poly GlassRub 50 Liquid Rubber is a two-part, liquid polyurethane system that cures (RTV) to a Glass-Like/Blue-Clear, Shore A50 rubber. GlassRub 50 is often used to make clear molds that can be cut away from a master with less chance of damage and better seam positioning since objects are visible through the rubber. In addition, GlassRub is used to make decorative rubber castings and art, as well as for encapsulating objects for intriguing display applications. With the addition of PolyColor Dyes, GlassRub can be used to create transparent parts of any color.


Current Stock:
Looking for larger sizes (e.g., drum kits)?
Please contact Customer Service at 800-858-5990 or sales@polytek.com

Technical Specifications

Mix Ratio by Volume:
Mix Ratio by Weight:
Shore Hardness:
Pour Time:
30 min.
Demold Time:
16 hr.
Cured Color:
Blue Clear, Glass-Like
Mixed Viscosity:
1,200 cP
Specific Volume:
27.5 in³/lb
Specific Gravity:
750 %
Tensile Strength:
360 psi
Die C Tear Strength:
74 pli

More Information

Material Calculator

Technical Bulletin

Safety Data Sheet - Part A

Safety Data Sheet - Part B

Kit Components
Poly GlassRub 50 Components
4-lb kit includes: 2 lb of Poly GlassRub 50 Part A (~1 quart)
2 lb of Poly GlassRub 50 Part B (~1 quart)
16-lb kit includes: 8 lb of Poly GlassRub 50 Part A (~1 gallon)
8 lb of Poly GlassRub 50 Part B (~1 gallon)
80-lb kit includes: 40 lb of Poly GlassRub 50 Part A (~5 gallons)
40 lb of Poly GlassRub 50 Part B (~5 gallons)

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