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Serving 3-D & clay artists in the Pacific Northwest and beyond since 1965
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Plaster, Tools & Gauze Rolls

 

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Safety Data Sheets for USG1 & USG2

Click on the image at left for a PDF that you can print.

USG1 Pottery
USG2 Moulding
 

Plaster

Plaster is one of the most flexible, versatile art materials made. Molds, sculpture, hobby crafts, medical and dental uses: plaster serves all these needs and more. We can help you determine which plaster is right for your intended application. All plaster is packaged in standard 50-pound bags. Other types of plaster and gypsum stone are available with minimum orders of 2,000-4,000 lbs.


USG1
Pottery #1 - out of stock -
Produces a break-resistant, smooth wearing mold designed for slip casting and jiggering applications. Formulated to provide stronger, longer-lasting ceramic slip cast molds. The industry standard for sanitaryware and dinnerware casting

Mix Ratio: 70:100
Expansion 0.21%
Crush PSI 2400
Set Time 27-37 min
Qty:

 

K59 (Georgia Pacific)
Pottery Plaster - USG1 Substitute
for all types of potteries & sanitary ware. Casts smooth and free of pinholes. Contains Densite plaster, requires less water (as little as 64:100) to achieve high fluidity. Resulting cast is exceptionally strong and long wearing.
Pallet is 4000#. Dry density is 69-71 lbs/sq ft

Mix Ratio: 68-70:100
Expansion 0.22 - 0.27%
Crush PSI 2000-2600
Set Time 25-35 min
Qty:

 

USG2
Molding Plaster - out of stock -
Great for plaster bats. A good utility plaster when expansion, hardness and strength are not of great importance.

Mix Ratio: 70:100
Expansion 0.20%
Crush PSI 1700-2500
Set Time 14-24 min
Qty:

 

GP4 (Georgia Pacific)
Molding Plaster - USG2 Substitute
Great for plaster bats. A good utility plaster when expansion, hardness and strength are not of great importance. Dry density 65-69 lbs/sq ft

Mix Ratio: 70-75:100
Expansion .15%
Crush PSI 1500-2000
Set Time 27-37 min
Qty:


USG3
Casting Plaster - out of stock -
Great for casting plaques and figurines. This general use industrial plaster is formulated for greater strength and chip resistance than regular plaster. Working properties and set time similar to Hydrocal White.

Mix Ratio: 70:100
Expansion 0.20%
Crush PSI 1700-2500
Set Time 14-24 min
Qty:

 

GP5 (Georgia Pacific)
Statuary Casting - USG3 Substitute
Great for casting plaques and figurines. This general use industrial plaster is formulated for greater strength and chip resistance than regular plaster. Dry density is 69-72 lbs/sq ft

Mix Ratio: 65-70:100
Expansion .18%
Crush PSI 3000-4000
Set Time 25-30 min
Qty:

 

USG4
Dental Lab Plaster -out of stock-
A general dental application plaster with a set time between 5 to 15 minutes.

Mix Ratio: 70:100
Expansion 0.20%
Crush PSI 2000
Set Time 5-15 min
Qty:

 

GP3 (Georgia Pacific)
Dental Lab - USG4 Substitute
Fine grind general purpose plaster should be mixed as thick as possible to achieve maximum strengh. Dry density is 85-87 lbs/sq ft

Mix Ratio: 48-50:100
Expansion 0.20 - 0.21%
Crush PSI 3700-4000
Set Time 6-8 min
Qty:

 

USG6
Hydrocal White Plaster
Our most general use plaster cement, it can be carved or added to, possesses excellent plasticity for workability, and a gradual setting time. Also has higher expansion properties.

Mix Ratio: 40-50:100
Expansion 0.42%
Crush PSI 6000
Set Time 20-30 min
Qty:

 

GP1WH (Georgia Pacific)
Denscal WH - USG6 Substitute
Ideal for art novelties, slush and solid casting, molds for latex novelties. It's high strength makes this neutral, general purpose gypsum cement a versatile performer for quality casting. Excellent hardness and low paint absorption. Dry density is 102-104 lbs/sq ft

Mix Ratio: 34-35:100
Expansion 0.3 - 0.35%
Crush PSI 7000-8000
Set Time 25-30 min
Qty:

 

USG7
Ceramical Gypsum Plaster
Designed for use in pressing clayware. Exceptional strength with consisten absorption. Store indoors. Shelf life 90 days.

Mix Ratio: 33:100
Expansion 0.13%
Crush PSI 6000
Set Time 18-23 min
Qty:

 

K40 (Georgia Pacific)
Ultra Densite K40 - USG7 Substitute
A specifically developed product which has been formulated to produce a purgable paster die with high strength, open purging, and quick releasing characteristics. Purgable plasters are used to press pugs of clay into molded shapes. Only available in 2000# super sacks. Dry density is 96-102 lbs/sq ft

Mix Ratio: 36-40:100
Expansion 0.035 - 0.05%
Crush PSI 6000-8000
Set Time 15-20 min
Qty:

 

USG11
Hydrostone Plaster
Hydrostone is an extremely hard and strong plaster. Its very low viscosity allows for excellent detail reproduction. Primarily used for high-quality art, novelty and statuary castings. Available in a non-yellowing formulation. Moderate expansion properties.

Mix Ratio: 22-100
Expansion 0.20%
Crush PSI 13,000
Set Time 15-25 min
Qty:

 

GP2ST (Georgia Pacific)
Denscal ST - Hydrostone Substitute
GP's strongest and hardest Denscal gypsum cement., receommended for applications that require smooth consistent hard surfaces. Exvellent for solid patterns, models and molds. Pallet is 4000#. Dry density is 110 lbs/sq ft

Mix Ratio: 30:100
Expansion .20%
Crush PSI 10,000-11,000
Set Time 15-25 min
Qty:

 

USG12
Hydrocal 105 Plaster
This yellow dental stone is very similar to Hydrocal White, but tinted for dental work.

Mix Ratio: 40-50:100
Expansion 0.42%
Crush PSI 6,000
Set Time 20-30 min
Qty:

 

USG13
Ultracal 30 Plaster
Designed for pattern making. High compressive strength and surface hardness. Extremely low expansion. It has a gradual set time with a long period of plasticity. Good for slash casting molds.

Mix Ratio: 38:100
Expansion 0.06-0.08
Crush PSI 6,500
Set Time 18-30 min
Qty:

 

Plaster Mixing Instructions

General Mixing instructions -
Your mixing container and equipment should be clean and free of all previous plaster mixing debris. Old plaster will cause your new mix to set irregularly and at a faster rate.
Water needs to be carefully and specifically measured. Water temperature is very important to your set time. Testing water is at 70F - use a thermometer! Hotter water will speed up your set time, cooler water will slow and retard the set time.
Plaster mixes into water: sift your plaster into the pre-measured water, allow to slake for 30 seconds and mix time will be about 30 - 60 seconds. Plaster ages, it is hydroscopic. Older plaster may require less water.
Adjusting and checking your Georgia Pacific (GP) plaster against USG plaster:
Nothing will be exactly the same as we all know. Correctly adjusting and controlling your water will be the key to achieving the best match for your needs.
Field Test Procedure - You will need the following:
Waxed or Plastic cup
Wooden stir stick
Thermometer
Timer
Straightened paperclip
Mix using 200 gram test amounts with the prescribed water for the given plaster at 70F. Mix in your cup as directed. Set your timer. As soon as the slurry appreciably stiffens, begin inserting the extended paperclip. When considerable pressure from your index finger is required to reach the bottom of the cup, you will have your set time. Test absorption by allowing the test cup of plaster to set overnight. Weigh your slug of plaster. Cover with room temperature water and soak for an hour. Re-weigh your slug of plaster. The % difference in weight will be your absorption. If you are matching this to your USG version, you need to make a slug of each for control purposes. If your set time or absorptions are different, these will be adjustable with more or less water and the temperature of the water.


For USG1, USG2, USG3, USG4, and USG5:

Mix should be 1 part water to 1 parts plaster (or 35 lbs water to 50 lbs plaster)
Slowly add plaster in water.
Allow to soak for 2 minutes.
Mix 2 minutes to heavy creme density.

 

For USG7:

Mix should be 16.5 pounds water to 50 pounds USG7.
Sift plaster slowly and evenly into water
Allow to soak for 2-5 minutes (less time for smaller batches).
Mix 10 minutes with high-speed mixer. Pour within 2 minutes of mixing.

 

For USG6 & USG12:

Mix should be 10 quarts water to 50 pounds USG6 or USG12..
Dump plaster in water.
Allow to soak for 2 minutes.
Mix 2 minutes to heavy creme density.

 

For USG11:

Mix should be 5.5 pounds water to 50 pounds USG11.
Slowly add plaster in water.
Allow to soak for 2 minutes.
Mix 2 minutes to heavy creme density. Longer mixing = stronger mold & shorter set

 

For USG13:

Mix should be 16.5lb - 18 lb water to 50 pounds ultracal.
Dump plaster in water.
Shift and allow to soak for 2 minutes.
Mix 1-2 minutes to heavy creme density. Longer mixing = stronger mold & faster set.

 


 

Steel Plaster Tools

PT63 + detail

Hand-crafted from the finest carbon steel and engineered to be extremely flexible, our multi-purpose steel spatula, No. 63, is the ideal modeling tool for working with clay and wax. Dual ends perfectly complement each other. One is rounded for smoothing your sculpting material, while the opposite end is pointed and serrated for cutting and texturing. 8 1/4" long and made in the USA.

PT63 - $30.00 Qty:

 

PT64 + detail

This super flexible high carbon steel modeling tool has been designed to work in clay, wax and plaster. This versatile sculpting tool can be used cold or heated by using an alcohol lamp. Two distinctly different ends include the flexible spatula for smoothing your modeling material and a serrated spear-shaped end for cutting and texturing. 9 1/4" long and made in the USA.

PT64 - $30.00 Qty:

 

PT71 + detail

The Large Steel Spatula is not only made of the finest carbon steel, but is also super flexible and especially easy to work with. Perfect for manipulating modeling clay and wax, this spatula is rounded at both ends for smoothing your modeling materials with ease. 10" long and made in the USA.

PT71 - $30.00 Qty:

 

PT73 + detail

This dual-ended spatula tool is designed with convenience and your productivity in mind. Uniquely crafted with one rounded end and one squared off gives this modeling tool a broad range of modeling uses. This Spatula is made of extremely flexible carbon steel, which makes this spatula perfect for working with clay and wax. 7" long and made in Italy

PT73 - $32.00 Qty:

 

PT90A + detail

Industrial in style and design, the sharp, hooked steel end of this modeling tool is serrated and ground sharp, making it ideal for cutting, scraping, and reducing quickly. Its thick wooden handle fits comfortably in your hand, adding no unnecessary strain to your hands and fingers while sculpting. 10 1/2" long and made in the USA

PT90A - $26.00 Qty:

 

Plaster Gauze Rolls

Plaster Gauze 50081K

For masks, mold backing, foundations and parts of sculptures; there is no end to the hundreds of uses for this versitile tape. Each box contains one roll that is 4" wide by 15' long.

The quantity discounts will not show up in the shopping cart, but we will apply them when we take your order off of the website.

1-5 rolls
6-11 rolls
12-31 rolls
32+ rolls
$5.00 ea
$4.00 ea
$3.50 ea
$3.00 ea
Qty:

All contents related to Georgies' products copyright 2021. All rights reserved.
Georgies Ceramic & Clay Co. 756 NE Lombard Portland OR 97211 503.283.1353 800.999.CLAY
Georgies of Eugene 1471 Railroad Blvd #9 Eugene OR 97402 541.338.7654 866.234.CLAY
Fax numbers: Portland 503.283.1387 Eugene 541.338.7565
Portland Store Hours: Monday-Saturday 9:00a to 5:00p Business Office Hours: Monday-Friday 9:00a-5:00p Pacific time
Eugene Store Hours: Sunday & Monday CLOSED Tuesday-Friday 9:00a-5:00p Saturday 10:00a-4:00p Pacific time

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