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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 70-11, 70-20, 70-25, & Gel 10

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 70-11, 70-20, 70-25, & Gel 10


TinSil 70-11, 70-20, 70-25, & Gel 10

from 39.00

These tin-cured (condensation-cure) silicone mold rubbers are soft to mid-range hardness, high-performance, room temperature curing systems offering excellent flexibility and toughness. Molds can be made from relatively simple models as well as highly detailed models with undercuts.

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

TinSil® Gel-10     1A:10B                                 A10                               45 min.             16 hr.                    Translucent

TinSil® 70-11        1A:10B                                A10                                45 min.             16 hr.                    Blue

TinSil® 70-20       1A:10B                               A20                               60 min.             16 hr.                    Blue

TinSil® 70-25       1A:10B                               A25                                60 min.            16 hr.                    Blue

TinSil® Brush/Spray 25 1A:10B                    A25                                 30 min.            16-24 hr.              Translucent

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

TinSil® 70-60       5A:100B                            A60                                30 min.            24 hr.                   Red


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.