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
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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 19 reviews
Bruce Philip
It's good

Good silicone. I wish I'd used a vacuum chamber to de-gas, it was full of bubbles even though the info says it doesn't need de-gassing. Luckily I brushed the surface with the silicone first so it wasn't too bad at all. Possibly user error but I'm not sure there's anything I could do to alleviate the bubbles

Frank Fordham

Did exactly what it said on the (plastic) tin. The only problem I have is the cost of the product and the quantities in what you can purchase it. Ideally, I would like to buy it in approximately a 2/3kg weight and hence a lower price per kg.than the trial size of 0.45kg.

Andy Cairns
Moldstar 16

I prefer moldstar 16 over 30.
30 needs longer curing time with no benefit to me.tends to tear in early molding stage unless I'm doing something wrong.

Peter Harris

Mold Star Pourable Silicone

Nigel Ogle
Tawhiti Museum review mold star silicone

I’ve used this product on a good range of projects now and I’m very satisfied with how it performs. Just get the price down and I’ll use it for bigger projects…!