Poly PT Flex is a range of fast-curing, pourable polyurethane casting rubbers from Polytek in hardnesses from Shore A20 to A85, made for prototyping and model making.
Poly PT Flex is a range of fast-curing, pourable polyurethane casting rubbers from Polytek in hardnesses from Shore A20 to A85, made for prototyping and model making.
The rubbers reproduce fine detail, shrink little as they cure and demould quickly, and they take colour from Polytek PolyColor dyes. The data sheet says they yellow in sunlight and are for interior use, and that they must not be used where food or body contact may occur.
Typical values from the Polytek technical bulletin, cured for 16 hours at 60 °C. Values are listed for PT Flex 20 / 50 / 60 / 70 / 85. All grades mix 1A:1B by weight.
| Property | Typical value | Test method |
|---|---|---|
| Hardness | Shore A20 / A50 / A60 / A70 / A85 | - |
| Tensile strength | 250 / 250 / 345 / 730 / 1,064 psi | - |
| Elongation | 770 / 200 / 235 / 175 / 250% | - |
| Tear strength | 50 / 50 / 70 / 130 / 190 pli | - |
| Elastic modulus | 85 / 160 / 190 / 915 / 2,700 psi | - |
| Specific gravity | 1.00 / 1.03 / 1.03 / 1.05 / 1.06 | - |
| Pour time (1 lb mix) | 5 / 8 / 5 / 5 / 5 minutes | - |
| Demould time at 70 °C | 30 minutes (all grades) | - |
| Shrinkage on cure | 0.0050 / 0.0020 / 0.0026 / 0.0041 / 0.0013 in/in | - |
| Full cure | 7 days at room temperature, or 16 hours at 60 °C | - |
Vacuum casting and open pouring into polyethylene or platinum silicone moulds, which need no release agent.
Complete Fabrication casts parts in Poly PT Flex at Lion Works in Whittlesford, near Cambridge, and finishes, paints and assembles them in house. Email your CAD to Info@compfab.co.uk or call +44 1223 836837. We quote fast. If you need a quote quickly, let us know and we will do our best to match your timings. See all materials we run.
Poly PT Flex is a range of fast-curing, pourable polyurethane casting rubbers from Polytek in hardnesses from Shore A20 to A85, made for prototyping and model making.
Poly PT Flex has a typical tensile strength of 250 / 250 / 345 / 730 / 1,064 psi, according to the Polytek data sheet.
Poly PT Flex has a hardness of Shore A20 / A50 / A60 / A70 / A85, according to the Polytek data sheet.
Poly PT Flex is used for casting decorative objects and production parts, tools, models and patterns, duplicate masters and flexible prototype parts in a range of hardnesses.
Yes. Complete Fabrication casts parts in Poly PT Flex at its workshop in Whittlesford, near Cambridge. Send CAD to Info@compfab.co.uk. We quote fast, and if you need a quote quickly, let us know and we will do our best to match your timings.
Values are typical figures from the Polytek data sheet. They vary with process, cure schedule and test method, and are not a specification. Check the current data sheet before you design with the material.
See also:vacuum casting in Cambridge, all material data sheets and what affects the price. To get parts made in this material, contact us.
