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Plaster, Stone and Gypsum Products
by Special Effect Supply

Plaster and Stone


See our Basic Materials Page for definitions and more details on these products.

Packaged in buckets.


UltraCal30

A favorite tooling gypsum used to make molds. Can be used for absorption molds. Favorite for making molds for foam latex.

CAT # Description Price Add
CAL30-10 Ultracal 30, 10 lb *S*
CAL30-25 Ultracal 30, 25 lb *S*
CAL30-50 Ultracal 30, 50 lb *S*

Price List   UltraCal30 MSDS Sheet

Hydrostone

Casting material that is very strong and very white. Can't be "built up" into walls. 10,000 psi. set time 17-20 minutes.

CAT # Description Price Add
HYD-10 Hydrostone, 10 lb *S*
HYD-25 Hydrostone, 25 lb *S*
HYD-50 Hydrostone, 50 lb *S*

Price List   Hydrostone MSDS Sheet

Hydrocal White

Casting material that is also strong and very white. 5000 psi. set time 25-35 minutes.
CAT # Description Price Add
HYDW-10 Hydrocal White, 10 lb *S*
HYDW-25 Hydrocal White, 25 lb *S*
HYDW-50 Hydrocal White, 50 lb *S*

Price List   HydroCal White MSDS Sheet

Hydrocal 105

Dental stone with a yellow tint. Can be used for dental prosthetic work. 6000 psi. set time 7-10 minutes.
CAT # Description Price Add
H105-10 Hydrocal 105, 10 lb *S*
H105-25 Hydrocal 105, 25 lb *S*
H105-50 Hydrocal 105, 50 lb *S*

Price List   HydroCal 105 MSDS Sheet

Mixing Ratios for Plaster and Gypsum

These are factory (high volume) recomendations. Your mixtures will probably be dryer than these.

Casting Plaster
65 parts water by weight to every 100 parts of product.

Molders' Plaster or No. 1 Pottery Plaster
70 parts water by weight to every 100 parts of product.

UltraCal30
38 parts water by weight to every 100 parts of product.

Hydrostone
32 parts water by weight to every 100 parts of product.

Hydrocal White
45 parts water by weight to every 100 parts of product.

Hydrocal 105
40 to 42 parts water by weight to every 100 parts of product.

Example: Suppose you wish to mix 100 lbs. of Hydrostone. For the factory recommended mix add 32 lbs. of water.

Notes:
Generally the less water the stronger the end product will be. Most artists mix by sight, which is often a dryer batch than the factory recommendation. A wet batch takes longer to harden and will not have sharp detail. A dry batch usually will have air bubbles or pockets and may harden too quickly. Don't use soft water. Don't breath the dust from these products. Don't use for body casting directly on the skin. It is normal for these products to get hot during the setting process.

For best results follow the following procedure:
1) Measure out powder and water in advance.
2) Sift powder into the water. You may start with about 3/4 of the water needed
and then use the remaining water later to adjust your batch.
3) Stir with a Jiffy Mixer (TM).
4) Don't put a new batch of plaster over a partially hardened mix.

Price List   Download a Price List Right Now!