Mixing Instructions
USG Industrial Plasters and
Gypsum Cements
Typical Physical Properties Use Consistency
(parts of water by weight per 100 parts of plaster)
Dry Compressive Strength (psi) Dry Impact Strength (g.cm) Density At Use Consistency
(approx. lb./ft.3)
Wet Dry
Plasters USG® Hobby Plaster 65 2,400 1,700 100.0 72.5
USG® Moulding Plaster 70 2,000 1,600 99.0 69.0
USG® Pottery Plaster 70 2,400 N/A 99.0 69.0
USG® White Art Plaster 70 2,000 1,700 99.0 69.0
Gypsum Cements HYDRO-STONE® 32 10,000 1,320 119.4 108.7
HYDROCAL® White 45 5,000 1,750 110.6 90.0
DryStone™ Casting Media 20

8,000(1 hr ambient)
10,000(2 day ambient)
16,000(oven-dried)

2,800 130 128
Hydro-Stone® Super X 22 13500 N/A 129 127.1
Tuf-Stone™ 32 10,000 3,300 122 112
Ultracal® 30 38 6,000 N/A 115 99

General Directions
and Guidelines
.

Roll over images for general instructions.

Recommended Equipment Measuring Measuring
Sifting Soaking Mixing
Pouring Demolding Finishing