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US GYPSUM PLASTERS AND CASTABLES
This page contains items related to plasters and
casting materials by US Gypsum.
Bulk discounts are available.
Please call us toll-free at 1-888-774-2529 to order large quantities of the items on this page. Thank you.
We also supply Bentonite,
fireclays, slip and many other materials used by artists and craftsmen
to create castings. See Raw Materials.
HELPFUL HINTS FOR MIXING PROCEDURES FOR DRY PLASTERS
Pottery Plaster Mix For Wedging Tables:
For wedging boards or tables mix 70 parts of water to 100 parts
plaster. This equals 4.17 gallons water per 50 pounds dry pottery
Successful mixing and use of industrial plasters requires following specific standards and procedures:
- The purest water available should be used; almost all drinkable water is suitable.
- A controlled temperature setting will provide the best results. Plaster and water should be contained at room temperature.
Room temperature is about 70 degrees.
- Since water-to-plaster ratios effect absorption, strength, and mold performance, they should be continually checked by
weighing the slurry in a container of known volume.
- If strength is the most important factor, longer mixing times are
suggested, taking care not to over mix into the setting action
of the plaster, which decreases strength.
- Batch size should allow for the pouring to be completed within 5 minutes after the slurry has been mixed.
- Plaster should be sifted slowly and evenly into water. Do not drop handfuls of plaster directly into the water.
- Hand mixing is only acceptable for batches up to 5 pounds.
US Gypsum Casting Materials and Other Plasters:
#1 CASTING PLASTER - Similar to
white art plaster, except mixed at a lower use consistency to increase
strength, chip-resistant, and to further minimize paint absorption.
#1 MOULDING PLASTER - Often referred to as “plaster of paris” or
soft plaster. Used for waste molds or temporary patterns where surface
hardness and strength are not important. Screeds well under template.
#1 POTTERY PLASTER - Highly uniform, noted for outstanding
performance and long life. The standard of the industry - this is the
best material available for sanitaryware and dinnerware casting. Used
for making plaster bats, wedging boards, and working molds. This is a
relatively soft plaster which may be used for carving.
CERAMI-CAL - A low-consistency form of HYDROCAL Gypsum cement
compounded to produce a dense, smoot- wearing die material for pressing
clayware. Characterized by low absorption, high strength, ability to
purge easily, and resistance to abrasion and wear. Specifically for use
with the RAM automatic clay-forming process.
DRYSTONE - Fast setting high strength product that needs no
drying. An environmentally sound alternative to resin-based products.
No hazardous chemicals or waste, no styrene emissions and no required
DURAMOLD - High performance plaster delivers a longer-lasting, more durable slip casting mold. Created to meet the demanding needs of the slip
casting industry. Compared to #1 POTTERY PLASTER, DURAMOLD features
longer mold life and higher wet and dry compressive strength.
Ideal for both casting and jiggering applications.
FAST CAST - A fast-setting grey cementitious product for casting
freestanding outdoor statuary and figurines. Can be demolded one hour
after set, allowing much higher production rates than conventional
cements. Designed to be mixed with sand - consult product literature
for additional information.
GARDENCAST - Similar to FAST CAST except a white-colored product
to be used with white sand. Consult product literature for additional
HYDROCAL FGR 95 - Unique, high-strength gypsum cement for use with glass fiber for fabricating glass-reinforced gypsum cement products.
HYDROPERM - A specially formulated product incorporating an
airentraining agent to provide permeability. For producing permeable
plaster molds for precision casting of many nonferrous metals and
HYDRO-STONE - One of the hardest and strongest of all gypsum
cements. When mixed properly, has a heavy, syrupy consistency ideal for
pouring solid models or patterns. Recommended for stretch-press dies
where extreme surface hardness is required. Slightly higher setting and
expansion than ULTRACAL 30. Used for high quality art novelty and
PURITAN POTTERY PLASTER - Unique, specially designed for use
with mechanical clay forming machinery. Absolutely the hardest, most
wear-resistant plaster made for molds, and a favorite for jiggering
STATUARY HYDROCAL - A basic HYDROCAL cement with a lower use
consistency of about 40 lbs. of water per 100 lbs. of plaster.
Extremely hard and strong with improved plasticity. Designed for solid
and hollow art casting.
TUF CAL - A polymer modified, high early strength, fibered
plaster that has been specifically designed for all statuary
applications where greater resiliency and chip resistance is desired.
Can be slush cast as well as solid cast. Mechanical mixing is required
for best results.
TUF STONE - Designed for solid casting with much higher
impact-and chip-resistance. Polymer modified and fibered for much
WHITE HYDROCAL - Used for making plaster objects, a neutral
gypsum cement having a normal set of 25 minutes. When formed under a
template it is slightly on the “short side” and has a tendency to tear.
The setting expansion is somewhat greater than ULTRACAL 30.
ULTRACAL 30 - This is a low-absorption gypsum cement for case
molds. Specially made for close-tolerance tooling - provides the
greatest hardness, accuracy and freedom from efflorescence of any
gypsum cement on the market. Recommended where extreme accuracy and
greater surface hardness are required, as in duplicator models. It has
the lowest expansion of any rapid-setting gypsum cement available. Has
a gradual set and long period of plasticity.
ULTRACAL 60 - Similar in all respects to ULTRACAL 30 except that
it sets in about one hour. Designed for very large models where
additional working time and the highest possible degree of accuracy are
USG Gypsum Plasters and Information