Poly Plasti-Flex Casting Resin

Flexible Casting PlasticPoly Plasti-Flex is a 35A:100B mix, flexible polyurethane casting material with a ~A90 hardness. It is a great option for casting slightly flexible and impact-resistant parts such as decorative trim, flex molding and millwork. Poly Plasti-Flex also works well for casting props and display items requiring high impact resistance.

Other applications include casting decorative objects, prototypes, models, architectural reproductions, duplicate masters, production parts, fixtures, props, tools and more.


  • Reproduces fine detail
  • Slightly flexible, impact-resistant
  • Can be machined, drilled, sanded (contains no silica)
  • Can be colored with PolyColor Dyes
  • Add PolyFiber II for brush-on or trowel application

For a lightweight, machinable polyurethane plastic with a wood-like density, consider Poly LiteCast Casting Resin.


Mix Ratio Shore Hardness Pour Time Demold Time Cured Color Mixed Viscosity Specific Gravity Specific Volume Maximum Exotherm
35A:100B ~A90 3 min. (1-lb mix) ~15 min. Tan 3,000 cP 0.81 34 in³/lb 190°F (2-lb mass)
Accessories: Poly 15 Part X AcceleratorPolyColor DyesPolyFiber IIPoly Purge Aerosol Dry Gas,

Product Literature: Poly Plasti-Flex & Poly LiteCast Technical Bulletin | Safety Data Sheets | Poly Plasti-Flex & Poly LiteCast Physical Properties Bulletin | Sealer & Release Agent Selection Guide


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