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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.

Poly 74-24, 74-29, 74-30, 74-41, & 74-45

Polyurethane Rubbers

These two-part, liquid mold rubbers can be poured, brushed or sprayed to make molds that cure at room temperature for casting plaster, wax, concrete, resins (polyurethaneepoxy and polyester) as well as polyurethane foam. They are the most versatile, easy-to-use and cost-effective mold materials available. Hardnesses range from a soft Shore A-20 to a very firm Shore D-45.

Poly 74-24, 74-29, 74-30, 74-41, & 74-45


Poly 74-24, 74-29, 74-30, 74-41, & 74-45

from 59.00

These polyurethane liquid mold rubbers are soft to mid-range hardness, high-performance, room temperature curing systems offering superior flexibility and toughness allowing durable molds to be made from relatively simple to the most highly detailed, undercut and complex models. The 74-Series liquid mold rubbers are supplied as pourable liquids so poured block and blanket molds can be made with ease.

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Product               Mix Ratio          Shore Hardness          Pour Time          Cured Color

Poly 74-20          1A:2B                 A20                              30 min.               Yellow

Poly 74-24          1A:1B                  A25                              20 min.               Amber

Poly 74-29          1A:1B                  A30                              30 min.               Black or White

Poly 74-30          1A:1B                  A30                              25-30 min.         Amber/Varies

Poly 74-30 HT    1A:1B                  A30                              25-30 min.         Amber/Varies

Poly 74-30 Clear1A:1B                  A30                              25-30 min.         Transparent Amber

Poly 74-41            1A:1B                 A40                              20 min.               Varies

Poly 74-45            1A:1B                 A45                              30 min.              Yellow


Softener  Add Poly 74/75 Part C Softener to 74-Series products for a lower-viscosity mix and a softer rubber.

Accelerator  Add Poly 74/75 Part X Accelerator to 74-Series products to accelerate the cure.

Thickeners  Use PolyFiber II or Fumed Silica to thicken the liquid mix for application by brush or trowel.

UV Stabilizer  Use UV additive to help reduce the characteristic surface degradation caused by sunlight.

Reinforcement Materials for Blanket Molds  Use Tietex® Fabric to reinforce blanket molds.

Product Life Extender  Use Poly Purge Aerosol Dry Gas to extend product life by spraying it into containers before resealing.