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Gypsnow is a powdered gypsum plaster that's terrific for faking objects—concrete, cinder blocks, bricks—that are lightweight, fragile, and will be destroyed on camera. The light weight and frailty of cured Gypsnow make it exceptionally safe to break up around talent and crew.

Able to be molded into any configuration, once hardened Gypsnow is easy to carve, cut, or shape.

It's frequently used to simulate impact effects or to build miniatures that will be smashed, crushed, wrecked, shattered, obliterated, or otherwise demolished on camera.

Sold in fifty (50) pound bags.

Sometimes referred to as 'pyrosil.'



General Notes:

Gypsnow expands rapidly with the addition of water. Due to its rapid expansion, the maximum recommended mix for any one pour is five (5) gallons.

The following quantities of Gypsnow and water will expand to just over the top of a five (5) gallon pail:

  • 9 lbs Gypsnow + 1.3 gallons water

When working with Gypsnow always:

  • Use warm NOT hot water
  • Coat the inside of the mold with a release agent such as Murphy's Oil Soap


  • Start with the required water in a 5-gallon pail
  • Add all of the Gypsnow powder at one time
  • Mix immediately for 3 to 5 seconds with a low speed paddle type mixing blade
  • Do not over mix
  • Pour as quickly as possible into the mold


  • Gypsnow must stay in the mold for 45 minutes to an hour before the finished product may be removed
  • The product must be allowed to dry for at least 48 hours before it is cut, carved, and/or painted


Gypsnow should be kept indoors where possible. If outdoor storage is the only option, ensure product is on a pallet off the ground and adequately covered to remain dry.

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