Vac Master 25

(3 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


  • 5
    Vac Master 25

    Posted by Rodney Billingsley on Nov 12th 2020

    I use VM25 to reproduce soft plastic lures, I can’t say enough positive things about this product, it picks up every detail and so far no breakdown or breakage of the molds, if you try this product don’t forget to use their mold release, it’s a must. Glad I found Alumilite!

  • 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! Skip