Poly 74-29 Liquid Rubber

poly-74-29Poly 74-29 is a 1A:1B mix, A30-A32 hardness, liquid polyurethane rubber that can be demolded in ~16 hours. This rubber is available in a black or white color. Molds made with Poly 74-29 exhibit high strength and high elongation properties. They are well-suited for casting materials such as concrete, plaster (for millwork, home décor, etc.), wax (candles & lost wax varieties) and resins (polyurethane, polyester, epoxy – with proper release agents).

Poly 74-29 molds can be poured as supplied or brushed-on by mixing in Poly Fiber II thickener. For brush-on application, 74/75 Part X accelerator can be used to speed the process. Poly 74-29 liquid rubber is an excellent multi-purpose, economical mold material that will provide long mold life, durability and consistent performance under high volume casting applications.


Mix Ratio Shore Hardness Pour Time Cured Color Mixed Viscosity Specific Volume Demold Time
1A:1B A30 30 min. White or Black 2,800 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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