![]() Use the list below to help you in making your decision. There are many beta Gypsums from which to choose. The exact amount you use will vary by how much plaster of Paris you need so long as. Because of their high water absorptive power, they make excellent pottery molds. 1.Sprinkle 2 parts plaster of Paris powder into a bowl with 1 part water. That's why they are easier to carve and scrape. Beta Gypsums are not as hard as the alpha gypsums. of water per 100 lbs of plaster ( consistency ratio). They require more water to make a workable slurry because of their irregular crystalline structure. Beta Gypsums are made by calcining in a kettle at atmospheric pressure. To help you choose the ones that best suits your needs, check out the list below.īeta Hemihydrates are known as industrial plasters, plaster of paris, kettle plaster and kettle stucco. I use 3 scoops of plaster to one scoop of HYDRO-STONE in my sculpted model work. You can mix an alpha gypsum with a beta gypsum such as moulding plaster to increase the plaster's strength or hardness. Alpha Hemihydrate is produced in many different formulations. Because of their extreme hardness some Alpha gypsums can not be carved or scraped after hardening. ![]() They are used primarily when greater strength is required. They require 22 to 45 lbs of water per 100 lbs of gypsum cement (this is called the Use Consistency Ratio). There are two basic categories of plaster that we use today:Īlpha Hemihydrate (alpha gypsum) and Beta Hemihydrate (beta gypsum)Īlpha Gypsums calcined under pressure are called gypsum cements - These Alpha Gypsum casts are harder and stronger with limited absorptive power. ![]()
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