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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 70-30

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 70-30


TinSil 70-30

from 39.00

TinSil 70-30 is a mid-range hardness, Shore A~30, 2A:100B mix, tin silicone that cures to a high performance, tough, silicone mold rubber for casting polyester, polyurethane as well as epoxy resins and other materials like wax, concrete and plaster. Excellent release properties, long mold life and good economy make the TinSil Series an excellent choice for any resin casting application. No release needed for most resin casting applications. Can be poured as supplied or thickened with TinThix liquid thickener for brush-on, blanket mold applications.

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

TinSil® 70-30        2A:100B                           A30                                60 min.            24 hr.                   Beige


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.