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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.

PlatSil 73-15 & 73-25

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.

PlatSil 73-15 & 73-25


PlatSil 73-15 & 73-25

from 47.00

PlatSil® 73-Series silicone mold rubbers are soft to mid-range hardness, high-performance, room temperature curing systems. They offer excellent flexibility, toughness, and chemical resistance. Suitable for making molds of simple shapes as well as complex models with fine detail and undercuts.

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

PlatSil® 73-15     1A:1B                              A15                             20 min.               4-5 hr.                White Translucent

PlatSil® 73-25     1A:1B                             A25                             15 min.               4-5 hr.                 Green


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

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

Retarder Add PlatSil® 71/73 Part R Retarder to slow the cure of PlatSil products.

Accelerator Add PlatSil® 71/73 Part X Accelerator to accelerate the cure of PlatSil products.


Call 205.541.5045 for bulk order discount prices.