Plaster Hydrostone (50 Pounds)

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HYDRO-STONE Gypsum Cement


Exceptionally strong gypsum cement designed for stretch-press dies and producing cope-and-drag equipment.* Produces high-quality, indoor novelty and statuary castings that require extremely hard surfaces and superior reproduction of fine detail. Superior expansion vs. Hydrocal® A-11 or B-11 gypsum cements. *High water absorption resistance.


Hydro-Stone® Gypsum Cement is especially suitable where high strength and resistance to water absorption are necessary. It is ideal for applications in both the tooling & prototyping and art & statuary categories.

Hydro-Stone® Gypsum Cement — For Tooling & Prototyping

  • Hydro-Stone® Gypsum Cement is ideal for stretch-press dies where extreme surface hardness is required. Offering greater expansion than Hydrocal® A-11 or B-11 gypsum cements, Hydro-Stone® Gypsum Cement:
  • Features a heavy, syrupy consistency, ideal for pouring into solid models or patterns (and making it ideal for filling multiple molds simultaneously)
  • Adapts to most flexible moulding compounds, due to its high absorption resistance
  • Sets in 17-20 minutes, after machine mixing

Requires 32 parts water by weight per 100 parts plaster.

NOTE — For best storage results, keep indoors in a dry, stable environment, away from drafts. 

Hydro-Stone® Gypsum Cement — For Art & Statuary

  • One of the hardest and strongest Hydrocal® products, Hydro-Stone® Gypsum Cement is used in the fabrication of high-quality art novelty and statuary castings. Offering excellent paintability, Hydro-Stone® Gypsum Cement:
  • Can duplicate extremely fine details
  • Works well in plaster and most flexible moulding compounds
  • Is self-leveling, with low viscosity
  • Provides fast set time for quick mold turns

DOWNLOAD usg-hydro-stone.pdf

 (50 Pounds)

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HYDRO-STONE Gypsum Cement
One of the hardest and strongest HYDROCAL Brand products. HYDRO-STONE is recommended for producing high-quality novelty and statuary castings requiring extremely hard surfaces. Use Consistency 32

Warning WARNING: This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which are known to the State of California to cause cancer.  For more information go to