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Poly 81-Series Liquid Mold Rubbers
Poly 81-Series polyurethane liquid rubbers are firm to very firm hardness, high-performance, room temperature curing systems offering superior strength and abrasion-resistance. They are hardest polyurethane rubbers available from Polytek®.
These rubbers are most often used to make very firm molds, mold liners, stamping tools, industrial parts, rollers, gaskets, mold shells, bumpers, pads and a number of other industrial parts and tools.
View all product options within this series under "Product Options" below:
- Two-part polyurethane rubbers
- Room temperature curing (RTV)
- Shore Hardness Options: A90 & D45
- Firm, high-strength, abrasion-resistant systems
- Low-viscosity, pourable rubbers
- Reproduces finest detail
- Long-lasting, economical
- Rubbers can be demolded after ~16 hours
Select an option below for additional product specifications and buying information:
| Product | Mix Ratio | Shore Hardness | Pour Time | Cured Color |
| Poly 81-90 | 100A:40B | A90 | 23 min. | Yellow |
| Poly 81-D45 | 100A:20B | D45 | 19 min. | Varies |
| Softener | Add Poly 74/75 Part C Softener to 81-Series products for a lower-viscosity mix and a softer rubber. |
| 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 PolyPurge Aerosol Dry Gas to extend product life by spraying it into containers before resealing. |
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