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Cast-a-Mold 25T

(5 reviews) Write a Review

$24.84 - $505.44

Cast-a-Mold 25T is a general purpose silicone with excellent tear strength. It's easy to mix and will cure at room temp over virtually any surface.

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Cast-A-Mold 25T is a general purpose rtv silicone elastomer which exhibits excellent tear strength, long library life, and accurate detail reproduction. Cast-A-Mold 25T is a condensation cured silicone (tin catalyzed ) It is used to make rubber molds that can be used to cast polyurethanes, epoxy's, polyester's, cement, concrete, soap, wax, plaster, etc.. It is easy to mix and de-air, and will cure at room temperature over virtually any surface. Cast-A-Mold 25T is extremely useful for applications where superior physical properties are required.

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Mix Ratio 10:1 by weight
Working Time 1.0 hour
Demold Time 16 hours
Heat Deflection 300°F +
Tensile Strength 600 psi
Elongation 500%
Tear Resistance 150 ppi
Color Green
Hardness 25-A
Viscosity 30,000 cps
  • 5 Eric on Dec 3rd 2021
    Mold Rubber Cast-a-Mold 25T

    Great product! Easy to measure out and mix by weight. Because of the contrasting colors, for tiny batches you can even mix to the desired final color (light turqoise) and it seems to work fine. Has a long pot life and naturally degasses very well. Is reasonably strong after curing and simple molds will last a long time. Complicated molds won't last as long but do capture every minute detail. Odors are minimal and not unpleasant. This has become my favorite molding rubber!

  • 5 Daniel Bryant on Aug 27th 2021
    The Best

    This stuff is great

  • 5 Stephen Canfield on Jul 20th 2021
    Cast a mold 25T

    I have been a happy customer nearly three (3) years. Dan and team are always professional and knowledgeable. In addition, very responsive , be it a question or shipment. Great product and a great team!

  • 5 Edward on Jul 2nd 2021
    Great stuff

    I've used a number of liquid silicones and this ones definitely my favorite. It's 1hr cure time was perfect considering I had to put it in a vacuum chamber and didn't want to worry about it hardening. The 1:10 ratio is also really easy to work with so I was happy with that too. 10/10.

  • 5 Joseph Pedigo on Jun 22nd 2021
    Works just like they say!

    I've been ordering this and many other products from S.R. for years. EXCELLENT customer service and support!