Poly 74-41 Liquid Rubber

poly-74-41Poly 74-41 is a 1A:1B mix ratio, liquid polyurethane mold rubber that cures to a Shore A40 hardness. The easy 1:1 mix ratio makes Poly 74-41 an alternative to Poly 74-40, which is a 2A:1B mix system.

Molds made with Poly 74-41 can be used to cast concrete, wax, plaster, as well as resins (polyurethane, epoxy, polyester resin) and foams with the appropriate release agent.

This rubber can be poured as supplied or can be mixed with Poly Fiber II thickener to make the rubber a brushable consistency. This rubber can also be accelerated for a rapid demold at room temperature using Poly 74/75 Part X Accelerator.



Mix Ratio Shore Hardness Pour Time Cured Color Mixed Viscosity Specific Volume Demold Time
1A:1B A40 20 min. Varies 2,000 cP 27.5 in³/lb ~16 hr.
Accessories: 74/75 Part C Softener, 74/75 Part X Accelerator, PolyFiber II Thickening Agent, UV Additive, Tietex® Fabric, Poly Purge Aerosol Dry Gas


Product Literature: Technical Bulletin | Safety Data Sheets | Physical Properties Bulletin | Sealer & Release Agent Selection Guide

Video Tutorials: For 74-Series video tutorials, visit the 74-Series page or the Polytek YouTube Channel.


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