Polytek 74-45


Poly 74-45 liquid polyurethane rubber cures to a very tough, high-tear, high-elongation rubber. This product is ideal for high volume concrete and plaster casting and is a very popular option for casting decorative architectural concrete panels and accessories.

Molds made from Poly 74-45 are also used for casting plaster wax (candles & lost wax varieties) and limited resins and foams (with the proper release agent).

Poly 74-45 molds can be poured as supplied or brushed-on by mixing in Poly Fiber II thickener or Fumed Silica. Poly 74-45 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
1A:1B A45 30 min. Yellow 2,500 cP 27.5 in³/lb ~16 hr.

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