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PT Flex Liquid Casting Rubbers
PT Flex Series liquid rubbers are polyurethane casting rubbers specifically designed for making prototypes as well as functional rubber parts. Unlike many other Polytek® polyurethane rubber products, these castable rubbers are low in viscosity and are fast-setting so they can be demolded rapidly.
These rubbers are commonly used in Prototyping, Prop Making, Industrial, Theming & Display, Model Making and Craft & Hobby applications.
PT Flex rubbers can be cast in PlatSil® silicone molds without any release agent and can be cast in polyurethane rubber molds, polyurethane plastic molds and latex molds with the proper release agent (e.g., Pol-Ease® 2300 Release Agent).
NOTE: New & Improved PT Flex Casting Rubbers no longer contain mercury. DO NOT mix “New & Improved” PT Flex rubbers with previous versions of PT Flex rubbers.
View all product options within this series under "Product Options" below:
- Two-part polyurethane rubbers
- Room temperature curing (RTV)
- Shore Hardness Options: A20 – D60
- Rapid demold times (2 hr. for most products)
- Low-viscosity
- Simple 1A:1B mix ratios
- Low shrinkage on cure
- Can be colored with PolyColor Dyes
Select a product below for additional product specifications and buying information:
| Product | Mix Ratio | Shore Hardness | Pour Time | Demold Time @ Room Temperature | Cured Color |
| PT Flex 20 | 1A:1B | A20 | 4 min. | 2 hr. | Tan |
| PT Flex 50 | 1A:1B | A50 | 5 min. | 2 hr. | Yellow/Amber |
| PT Flex 60 | 1A:1B | A60 | 5 min. | 2 hr. | Yellow/Amber |
| PT Flex 70 | 1A:1B | A70 | 4 min. | 2 hr. | Yellow/Amber |
| PT Flex 85 | 1A:1B | A85 | 5 min. | 2 hr. | Yellow/Amber |
| PT Flex D60 | 2A:1B | D60 | 10 min. | 16 hr. | Amber |
| Color Dyes | PolyColor Dyes can be used to color PT Flex Series rubbers. They are available in Black, Brown, Blue, Green, Red, Yellow, and White and Fleshtone Pigments. |
| Softener | Add Poly 74/75 Part C Softener to PT Flex products for a lower-viscosity mix and a softer rubber. |
| Accelerator | Add Poly 74/75 Part X Accelerator to PT Flex products to accelerate the cure. This will also reduce the pour time. |
| 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. |
| Product Life Extender | Use PolyPurge Aerosol Dry Gas to extend product life by spraying it into containers before resealing. |
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