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How to Make Plaster of Paris [Calcium Sulfate] at Home Using Chemistry

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Published on Jun 11, 2012

In this video I will show you how to make Plaster of Paris with easy to get chemicals. You will need calcium chloride (This can be bought as DampRid) and magnesium sulfate(This can be bought as Epsom salts)

In order to precipitate the calcium sulfate you will need to dissolve the chemicals in water. There is a specific ratio you need to use in order to get the maximum yield of plaster that is about 1:2.3 calcium chloride to magnesium sulfate.

When you mix the chemicals together you should see solid plaster to come out of solution. You then have to filter the solution. After the first filtration it is recommended that you do a second filtration to achieve a maximum yield of plaster. Just take the filtrate from the first filtration and add enough water to cover the plaster by double.

After the second filtration in order to dehydrate the calcium sulfate and change it into plaster you need to heat it to 350 F. Do not heat the plaster above 350 F. After the plaster is dried and activated you just need to grind it up.

In order to use the plaster you need to add enough water to wet the plaster and make it liquid but not enough to make it runny.

Thanks for watching!

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