Poly 75-70 Liquid Rubber

poly-75-70Poly 75-70 is a 1A:1B mix ratio, liquid polyurethane rubber with a long pour time (40 min). Molds made from this rubber exhibit high tensile strength, tear strength, and elongation.

Poly 75-70 is used primarily for making tough, durable molds, form liners and stamps for casting, forming and texturing concrete. Molds are also often used to cast plaster, wax, and limited resins and foams with the proper release agents. Common cast products include decorative concrete countertops, precast architectural panels, sound barriers, fences, pavers, slabs, patio stones, retaining wall blocks and for virtually all other types of cast stone and GFRC applications.

This rubber has high abrasion resistance and long mold life for high volume casting operations.


Mix Ratio Shore Hardness Pour Time Cured Color Mixed Viscosity Specific Volume Demold Time
1A:1B A70 40 min. Gray 3,000 cP 27 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 | Sealers & Release Agents Selection Guide

Video Tutorials: For 75-Series video tutorials, visit the 75-Series page or the Polytek YouTube Channel.


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