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Birmingham Rubber & Plastics carries a complete and versatile line of liquid mold rubbers, liquid casting plastics/resins/foams and other specialty molding and casting materials. If there is anything you need which we do not carry, ask! 

1527 Bellview Circle, Homewood, AL 35209                          


1527 Bellview Cir
Birmingham, AL, 35209
United States


Birmingham Rubber & Plastics carries the most complete and versatile line of liquid mold rubbers, liquid casting plastics/resins/foams and other specialty molding and casting materials from Polytek Development Corp. These mold materials include two-part, high-performance RTV polyurethane, silicone as well as one-part latex and other specialty systems. These liquid rubbers and plastics are used in countless applications where the flexibility and ease-of-use of rubber molds are needed to create exact, highly detailed reproductions of any original model in concrete, plaster, resin, foam, wax and more. Individual artists, sculptors, hobbyists, model makers and industrial users rely on Polytek products and technical support to accurately mold and reproduce parts quickly, consistently, and cost-effectively.

TinSil 80-15, 80-30

Silicon Rubbers

These two-part, room temperature curing systems offer the greatest flexibility, tear strength and chemical resistance and eliminate the need for release agents when resin casting. Well-suited for almost any casting medium (plaster, wax, concrete, resin and foam) these mold materials are ideal for repeated casting in liquid resins/plastics/foams. More expensive than polyurethane rubbers, but well worth the expense when casting higher volume resin casting is required.

TinSil 80-15, 80-30


TinSil 80-15, 80-30

from 39.00

The TinSil® 80-Series is a line of tin-cured silicone mold rubbers that are designed to offer reduced shrinkage upon cure and during casting, longer storage/library life once cured and longer useable mold life than other tin-cured systems. The highest performance materials and processes have been used to develop this next-generation tin silicone for the most demanding casting applications.

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Product          Mix Ratio by Weight          Shore Hardness          Pour Time       Demold Time       Cured Color

TinSil® 80-15  1A:10B                                 A15                               30 min.             24 hr.                    Peach

TinSil® 80-30 1A:10B                                 A30                               45 min.            24 hr.                     Peach


Softener Add Silicone Fluid 50cs to TinSil products for a lower-viscosity mix and a softer rubber.

Thickener Add TinThix liquid thickener to thicken the liquid mix for application by brush or trowel.

Accelerator Use TinSil FastCat in place of any TinSil Part A in order to accelerate cure and shorten demold time.