Polygel® Spray 35 Rubber


Polygel® Spray 35 is a Shore A35, spray-on, polyurethane liquid mold rubber designed for making thin, stretchy, flexible molds of larger, complex originals. When low-viscosity Part A and Part B are mixed using a portable Plas-Pak sprayer or more sophisticated spray equipment, the mixture self-thickens to a creamy consistency ideal for quickly creating blanket or glove molds of complex objects. Polygel® Spray rubbers allow molds to be made in one application. For a self-thickening brush-on rubber for smaller mold making projects, consider Polygel® 35 Brush-On Rubber.

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


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:
Working Time:
10 min.
Demold Time:
16 hr.
Cured Color:
Light Blue, Varies
Specific Volume:
27.5 in³/lb
Specific Gravity:
627 %
Tensile Strength:
507 psi
Die C Tear Strength:
71 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® 35 Components
80-lb kit includes: 40 lb of Polygel® Spray 35 Part A (~5 gallons)
40 lb of Polygel® Spray 35 Part B (~5 gallons)

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