USG Hydro-Stone is a premium high-strength gypsum cement for finished castings that require exceptional hardness, durability and fine-detail reproduction. It is an excellent choice for art, statuary, models, architectural details and other cast gypsum objects where ordinary plaster or Hydrocal White does not provide enough surface hardness. If the main requirement is dimensional accuracy in a mold or tooling system rather than strength of the finished casting, compare Ultracal 30. Browse the full USG Plaster & Gypsum Cement collection.

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.

MAIN FEATURES

• 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: 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; 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.
• Hydro-Stone® Gypsum Cement — For Art & Statuary: one of the hardest and strongest Hydrocal® products, used in the fabrication of high-quality art novelty and statuary castings. Offers excellent paintability, can duplicate extremely fine details, works well in plaster and most flexible moulding compounds, is self-leveling with low viscosity, and provides fast set time for quick mold turns.

NOTE — For best storage results, keep indoors in a dry, stable environment, away from drafts. Do not stack more than two pallets high.