Cast-a-Mold 25T

Made in the USA

When you buy from SRC, you'll receive fresh American-made materials every time, direct from the source.

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.

$24.99
$24.99 $24.99
Size: 16 oz 1.1 lbs
Shipping calculated at checkout.

In Stock
Cast-a-Mold 25T, Half Gallon
$24.99
$24.99 $24.99

What customers say

  • Fantastic resin and Specialty Resin has always been prompt with not only dispatching orders but also with answering any questions I have had.

  • Great range of products, some of the best resins I've used come from here and hope to use more soon. All the best with the move I hope all there are well, take care in these uncertain times

  • great product and company very generous through the years ! always helped me with any problem ! 5 out of 5 stars

Description

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.

Specifications

Mix Ratio 10:1 by weight
Working Time 1.0 hour
Demold Time 16 hours
Heat Tolerance 300°F +
Tensile Strength 600 psi
Elongation 500%
Tear Resistance 150 ppi
Color Green
Hardness 25-A
Viscosity 30,000 cps

Resources

Cast-a-Mold 25T - Technical Data Sheet with Instructions

Cast-a-Mold 25T - Safety Data Sheet

Quality You Can Trust

  • Made in the USA

  • Direct from the Source

  • Money Back Guarantee

Frequently Asked Questions

What happens to resin if it has passed its shelf life?

When a product has exceeded its shelf life, the casting process can become unstable. Working time and demolding time will likely change as well.

Does temperature play a role in the casting process?

Temperature plays a major role when it comes to mixing and curing silicone, resin or epoxy. Heat and humidity can speed up your curing time and cooler temperatures will do the opposite and slow down your curing time.

How much metallic or glow-in-the-dark powder am I supposed to use in my resin or epoxy project?

When adding metallic or glow-in-the-dark powder to your resin, you should start by adding small amounts and continue to add more until you reach the desired result.

What is the right amount of pigment to use?

When adding pigment to a project remember a little goes a long way. Add pigment by drops until you reach the desired color. Make sure to make a note of how much pigment you used so you can match if making multiple batches.

How do I eliminate bubbles in my silicone mold?

There are few ways you can eliminate bubbles in your silicone rubber mold:

  • Degas material within the working time frame.
  • Pour a thin stream and allow material to slowly fill in any negative space.
  • Use a thinning agent that will allow bubbles to rise faster.

Customer Reviews

Based on 27 reviews
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HB
Love this stuff! Be sure to degas it! (read review)

This stuff is great, especially if you're working with items that have sulfur in them, like 3d printer resins. The platinum-cure silicone is much too sensitive, but this tin cure gives me ZERO issues. It's very forgiving to mix up, I like the liquid component, since I only have to fuss with one thick, sticky substance when mixing. The 10:1 ratio of one thick component and one liquid is actually easier to measure than products with a 1:1 ratio of thick components. It cured perfectly every. Single. Time.

One thing is that this is VERY THICK when mixed, and is not self-degassing. To get perfect molds with no bubbles, you WILL need to use a vacuum chamber. I, luckily enough, have one, but made a very bad cast full of holes before realizing my error. This is user error, not fault in the product, and I hope to save other newbies some time with this review.

I used mine to create master molds for custom dice sets! It was a lot of work, but I'll be buying this product again, when the time comes.

G
Gary
I was pleased with all aspects of the Cast-a-mold 25t

I was pleased with all aspects of the Cast-a-mold 25t. It worked well, had plenty of working time, and made a beautiful mold of my part.

The cure time was also very convenient, and skinned over well.

I am pleased with the product, and would buy and use it again! Gary

M
Michael Harris

Worked beautifully!!

v
vincent J mcconnell

first time using and this is the first product that the molds have fully cured.

M
Michael Criswell
Taxidermy usage

I decided to try your products for taxidermy molding/casting due to the expensive cost of other products. I have been pleasantly surprised how great the 25T has been for molding small parts. I am about to dive into larger items soon. Thank you for a great product

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