Poly 75-Series Liquid Mold Rubbers

poly-75-seriesThese polyurethane liquid mold rubbers are mid-range (A60) to firm (A90) hardness, high-performance, room temperature curing systems. They offer superior strength, toughness and abrasion-resistance that result in durable molds that capture and reproduce exact textures and the finest detail from any model. Poly 75-Series rubbers offer an optimum blend of economy and performance.


  • Shore A60 to A90 hardness liquid mold rubbers
  • Pourable liquid rubbers so poured block and poured blanket molds can be made with ease
  • High-strength, abrasion-resistant, super-tough rubbers
  • Reproduces fine details and textures
  • Long-lasting, economical
  • Can be accelerated for rapid cure
  • Ideal for high volume casting applications
  • All rubbers can be demolded after ~16 hours


Typical Uses

  • precast concrete pavers, slabs, retaining wall blocks and other cast stone applications
  • flexible formliners
  • concrete countertop forms
  • molds for architectural GFRC and restoration applications
  • concrete stamping tools & skins
  • firm rubber parts and tools (rollers, dyes, flexible duplicate masters)
  • numerous hobby, craft, prop, display and general mold making & casting projects
  • View more applications in the 75-Series Product Photo Gallery (gallery also includes 77-Series & 81-Series rubbers).


Product Options

Product Mix Ratio Shore Hardness Pour Time Cured Color
Poly 75-59 1A:1B A60 10 min. Amber
Poly 75-60 1A:1B A60 10 min. Amber
Poly 75-65 1A:1B A65 35 min. Amber
Poly 75-70 1A:1B A70 40 min. Gray
Poly 75-75 2A:1B A75 20 min. Amber
Poly 75-79 2A:1B A80 20 min. Yellow
Poly 75-80 2A:1B A80 45 min. Yellow
Poly 75-90 2A:1B A90 10-15 min. Opaque Amber
Softener Add Poly 74/75 Part C Softener to 74-Series products for a lower-viscosity mix and a softer rubber.
Accelerator Add Poly 74/75 Part X Accelerator to 74-Series products to accelerate the cure.
Thickeners Use PolyFiber II or Fumed Silica to thicken the liquid mix for application by brush or trowel.
Reinforcement Materials for Blanket Molds Use Tietex® Fabric to reinforce blanket molds.
Product Life Extender Use Poly Purge Aerosol Dry Gas to extend product life by spraying it into containers before resealing.
UV Stabilizer Use UV additive to help reduce the characteristic surface degradation caused by sunlight.


Product Literature

75-Series Technical Bulletin | 75-Series Physical Properties Bulletin


Video Tutorials

How to make a concrete stamping mat using Poly 75-80:


Other tutorials on the Polytek YouTube Channel:


Tutorials & Other Information on the Polytek Blog