Vac Master 25

(2 reviews) Write a Review

Vac Master 25 is the ideal urethane for abrasion resistance and durability – it has good physical properties and low shrink.

  • Best choice for abrasion resistance
  • Needs to be agitated before measuring
  • Not recommended for machining

Prior to using product, please read all Technical Data, Safety Data, and Instruction sheets linked below.



Technical Specifications

Vac Master 25
Mix Ratio:
1:1 by weight
Pot Life:
6-8 minutes
Demold Time (100 gram mass):
2-3 hours
Mixed Viscosity (cps):
Specific Gravity:
Shore Hardness (ASTM D2240):
80 D
Shrinkage (in./in.):
Tensile Strength (ASTM D-638, psi):
Elongation (in./in.):
< 1%
Temperature Resistance:
250º F


  • 3

    Posted by Leonard Jones on Jul 16th 2020

    Takes a long time to mix, even with a paint shaker and a paddle mixer. Make sure after mixing you use a strainer on part A and B or you will wind up with a $65.00 paper weight like me. Does drill well and machined well just takes a long time to mix.

  • 5
    Great product!

    Posted by Skip Boyer on May 1st 2020

    I called and asked what product these folks suggested making holster molds from and was told they suggested Vac Master 25. I have never worked with two part urethane before so....this was going to be a first! I had also never made a gun mold before was really going to be a first! haha
    Long story short, my molds held up and made some class act holster molds! Great product, wonderful results.

    God bless!