Poly 74-44 Liquid Rubber

Poly 74-44 is a 2A:1B mix, A45-A48 hardness, liquid polyurethane rubber that can be demolded after ~16 hours. This rubber has high elongation and tear strength properties.

It is designed for making high-performance rubber molds for casting materials such as plaster (millwork, home décor, etc.), wax (candles & lost wax varieties), concrete, GFRC, GRG and resins (polyurethane, polyester, epoxy – with proper release agents).

This rubber can be poured as supplied or may be thickened with PolyFiber II or Fumed Silica for brush-on application. Poly 74-44 liquid rubber is an excellent multi-purpose, economical mold material that will provide long mold life, durability and consistent performance under repeated casting.



Mix Ratio Shore Hardness Pour Time Cured Color Mixed Viscosity Specific Volume Demold Time
2A:1B A45 20 min. Gray 3,500 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.


Select a Kit: