Overnight Cure Urethane Elastomers - Flexible


Urethane rubber is generally less expensive than silicone rubber and more abrasion resistant, making it a preferred material for concrete and architectural castings. However, flexible urethanes are not self-releasing and therefore require a more thorough procedure (wax and PVA) to facilitate clean and easy part release.

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Specification Table


Freeman 1035 Mold Making Polyurethane Elastomer

Flexible mold making casting resin that is castable to 2" thickness / 30 Min. Gel Time / 35A +/- 5 Shore Hardness

Freeman 1040 Mold Making Polyurethane Elastomer

Flexible mold making casting resin that is castable to 2" thickness / 28 Min. Gel Time / 45-55A Shore Hardness

RenCast 6400-1 / Ren 6400-2 High Elongation Flexible Polyurethane

52A Shore Hardness Casting Resin / 30 Min Gel Time / 1,300 cps viscosity

RenCast 6401-1 / Ren 6401-3 Tough, Resilient Mold Making Polyurethane

65A Shore Hardness Casting Resin / 20 Min Gel Time / 1,000 cps viscosity

RenCast 6410-1 / Ren 6410-2 Very Flexible Mold Making Polyurethane

37A Shore Hardness Casting Resin / 30 Min Gel Time / 1,200 cps viscosity

Ren Accelerator 178-62

Additive used to accelerate the curing time for specific urethane elastomers.

ISOMold URP 4102

Low Viscosity flexible urethane with easy 1:1 mix ratio

ISOMold UMR 411 (formerly URN-4103)

40A Shore Hardness / 15 Min Gel Time / 725 cps viscosity

ISOMold UMR 611 (formerly HRS-5132)

20 min. gel time, 60 shore A hardness

ISOMold S333 (formerly URP-4106)

35A±2 Shore Hardness / 20 Min Gel Time / 1,500 cps viscosity

ISOMold UMC 501 (formerly URP-5121)

50A +/- 2 Shore Hardness / 20 Min Gel Time / 2,200 cps viscosity