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Ceramical Plaster is only available in 50lb bags
When selecting your quantity, be sure to only use increments of 50lbs.
Ceramical Gypsum Cement is a low -consistency form of Hydrocal and is ideal for making durable press molds typically used for RAM-pressing. Denser than No.1 Pottery Plaster, Ceramical is much stronger and has a lower absorption. Good resistance to abrasion and ware.Always store plaster in a warm, dry, clean place. Do not use plaster that is lumpy--as a result of storage, it has absorbed moisture from the air and will have lower strength.
Always use room temperature, potable water. The Ceramical and water should be mixed mechanically with a high-speed (1750 rpm) propeller-type mixer for about
10 minutes. The slurry should be poured within two or three minutes after mixing.
The setting time is affected by water temperature, speed, and duration of mixing. The warmer the water, the faster the set. The longer the mixing procedure and greater agitation, the faster the setting time will be. The greater the plaster to water ratio, the faster the set. Older plaster sets slower. Keep all mixing equipment clean.
1 Hr. Compressive Strength 3,000 psi 20.6 MPa
Dry Compressive Strength 6,000 psi 40.9 MPa
1 Hr. Modulus of Rupture 825 psi 5.7 MPa
Dry Modulus of Rupture 955 psi 6.6 MPa
Maximum Setting Expansion (%) .13% .13%
Density Wet 115.1 lb/ft3 1.84 g/cc
Dry 96.5 lb/ft3 1.55 g/cc
Set Time (Machine Mix) 18-23 min. 18-23 min.