The Compleat Sculptor
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Casting Product Index - Accessories Index
See also Gypsum Accelerator & Retarder

  USG® Dry Stone

 

 

 Click here for MSDS.
  • The best available for sanitaryware and dinnerware casting
  • Formulated for long life and reduced breakage (stronger molds.)
  • Available with or without thermal shock additive.
Technical Properties English
Use Consistency (parts of water by weight per 100 parts plaster ) 18-20
1 Hr. Compressive Strength 8000 psi
Dry Compressive Strength 16,000 psi
Total Absorption Capacity 2.5%
Maximum Setting Expansion 0.275%
Density
Wet 130 lb/ft3
Dry 128 lb/ft3
Set Time (Machine Mix)* 15-25 min.
*Other set times may also be available. Call your sales representative for more information. Hand mix times will be longer.
 
General Directions and Guidelines
  Preparing the Mix Use potable water at temperatures between 70° and 100°F (21° and 38°C). Since variations in slurry (the Drystone and water mixture) temperature produce variations in setting time, it is important to keep both the plaster and water in a stable temperature environment prior to use. The higher the temperature of the water, the shorter the set time. See the graph below.
 

Weigh both the Drystone and water for each mix. The water-to-plaster ratio is critical because it governs both the strength and the absorptive capacity of the mold.
 
  Soaking Do not soak Drystone.
 
  Mixing

Properly mixing Drystone is one of the most important steps in producing plaster molds with maximum strength, absorption, hardness, and other important properties.

Mechanically mixed plasters develop uniform molds with optimal strengths. Plasters can be mechanically mixed through both batch and continuous processes.

Longer mixing times result in higher mold strength and shorter setting times. The relationship between mixing time and both compressive strength and setting time is a direct relationship.
 
  Pouring Drystone casting medium can be used with most mold materials such as silicone, latex, or urethane type molds. To prepare the mold make sure it is clean, then dip the mold or spray it with a suitable mold-release. Using a steady rate, pour the Drystone casting media slurry into one corner of the mold or into the lowest point and allow the slurry to rise and seek its own level. Continue pouring until the mold is full. To minimize air entrapment and bubbling, mechanically vibrate, shake or rotate the mold or the surface. DO NOT vibrate for more than 30 seconds. Demold after approximately 30 minutes.
 
  Storage Keep in a dry, stable environment indoors. Do not stack more than 2 pallets high. Keep from drafts. Rotate stock.
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Although we try to keep the most updated prices on our website, all prices are subject to change.
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