Pouring Mold Star into a two part mould.
Mold Star Pourable Silicone
Mold Star Pourable Silicone
Mold Star Pourable Silicone
Mold Star Pourable Silicone
Mold Star Pourable Silicone
url:https://cdn.shopify.com/s/files/1/0361/6889/files/MOLD_STAR_15_16_30_TB.pdf?529|alt:Mold Star 15, 16 and 30 Technical Data Sheet

Mold Star Pourable Silicone

  • Smooth-On
  • From $79.99
    Unit price per 
  • Incl. GSTExcl. GST: $69.56

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Manufacturer Information

Mold Star 15, 16 and 30 Technical Data Sheet


Easy to Use Silicone Mold Rubber

Mold Star™ silicones cure to soft, strong rubbers which are tear resistant and exhibit very low long term shrinkage. Molds made with Mold Star™ will last a long time in your mold library and are good for casting wax, gypsum, resins, concrete and other materials. Cured Mold Star™ rubber is heat resistant up to 450°F (232°C) and is suitable for casting low-temperature melt metal alloys.

NOTE: This product will not work with modeling clays containing sulfur under any circumstances.

One to One Mix Ratio

Mold Star™ rubbers are mixed 1A:1B by volume (no weighing scale necessary) for precise measurements even at a very low mass and cure at room temperature with negligible shrinkage.

No Vacuum Degassing

Mold Star™ silicones feature relatively low viscosities making vacuum degassing optional and is not required for most applications. A uniform flow will help minimize entrapped air.

Translucent Options

Make Fast Cut Molds or Castings

Mold Star™ 19T, 20T, and 31T are translucent silicones for making fast molds or casting into alginate molds. They offer fast cure times, multiple hardnesses, and an infinite number of color effects achieved by adding Silc Pig™ silicone pigments or Cast Magic™ effects powders.

Mold Star - Safety Data Sheet (SDS)


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Customer Reviews

Based on 14 reviews
Mold Star

Great product for the mold i made of old small plastic toy parts no longer available AAA

Pourable silicone

Fabulous product, did exactly as required


Mold Star Pourable Silicone

Mould for flower

Made a beautifull mould. Simple to make, no problems

Good product but poor information about it

I wasted so much time, money and product trying to use it without vacuum degasing. The product website claims degasing isn't necessary however my experience is that it is. I even called the fiberglass shop and they offered no opinion besides follow the smooth-on website instructions. A better quality of service would have been able to offer an opinion which should be basic industry standards so as to not waste so much of my time, money and product

Hi Jordan,

Sorry to hear that you had issues with Mold Star, we haven't had any feedback similar to yours, so I'm surprised you're having bubble issues.

As we are just a distributor of the product, not a workshop, we don't have huge amounts of experience with it, the small samples we have done have worked fine, but since every application is different, more complex pours might be an issue.

As we don't have huge experience with all of the different products available, you will get more valuable information from the manufacturer of the product. We've found that Smooth-On's support has been fantastic in the past, and they can provide information and expertise that we simply do not have.

Because every application is different, it is difficult for us to give direct opinions as this will then become our liability if your application isn't the same as everyone else's experience.

Due diligence is the key to these products, there is plenty of information available on the manufacturers website, YouTube videos of people using this product and more with no issues, datasheets and more. They are using the exact same product.

I'm sorry this product doesn't live up to your expectations, I hope you're able to find a product that may be more suitable to what you are doing, and I wish you luck with your future projects.