Polygel® Brush-On 35 Rubber


Polygel® 35 is a self-thickening, brush-on polyurethane liquid mold rubber designed for making thin, stretchy brushed molds. When Part A & Part B are mixed together, the rubber self-thickens to a creamy consistency ideal for making molds on vertical and overhead surfaces. Mold makers often apply the first layer of Polygel® 35 without any additional thickener and then add PolyFiber II Thickeners to subsequent layers. A sprayable version of Polygel® is also available in a Shore A35 hardness (Polygel® Spray 35)

WARNING: This product can expose you to chemicals including Toluene diisocyanate (TDI), which is known to the State of California to cause cancer. For more information, go to www.P65Warnings.ca.gov


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Technical Specifications

Mix Ratio by Volume:
Mix Ratio by Weight:
Shore Hardness:
Working Time:
10-15 min.
Demold Time:
16 hr.
Cured Color:
Light Blue
Specific Volume:
27.5 in³/lb
Specific Gravity:
620 %
Tensile Strength:
436 psi
Die C Tear Strength:
70 pli
The color of polyurethane Part Bs may change in color from batch to batch or may darken with age, but product performance is not affected.
Foundry Waxes:
Certain foundry waxes can cause excessive oiling in Polygel rubbers; this is the case when liquid Polygel is applied to the foundry wax and when the foundry wax is poured into cured Polygel molds. Perform a small test cure to ensure compatibility.

More Information

Material Calculator

Technical Bulletin

Safety Data Sheet - Part A

Safety Data Sheet - Part B

Kit Components
Polygel® Brush-On 35 Components
4-lb kit includes: 2 lb of Polygel® Brush-On 35 Part A (~1 quart)
2 lb of Polygel® Brush-On 35 Part B (~1 quart)
16-lb kit includes: 8 lb of Polygel® Brush-On 35 Part A (~1 gallon)
8 lb of Polygel® Brush-On 35 Part B (~1 gallon)
80-lb kit includes: 40 lb of Polygel® Brush-On 35 Part A (~5 gallons)
40 lb of Polygel® Brush-On 35 Part B (~5 gallons)