Plaster Usg #1 Pottery (50 Pounds)

  • Buy 2 for $18.70 each and save 4.3%
  • Buy 10 for $18.13 each and save 7.2%
  • Buy 20 for $17.55 each and save 10.2%
  • Buy 40 for $16.29 each and save 16.6%
  • Buy 80 for $15.84 each and save 18.9%

USG No. 1 Pottery Plaster

A superior plaster for casting decorative ceramicware, sanitaryware, dinnerware and fine china. Available with or without thermal shock additive.


  • No. 1 Pottery Plaster produces a break-resistant, smooth wearing mold designed for slip casting and jiggering applications. No. 1 Pottery Plaster:
  • Is formulated to provide stronger, longer-lasting ceramic slip cast molds
  • Is the industry standard for sanitaryware and dinnerware casting
  • Has a recommended use consistency by weight of 70 parts water to 100 parts plaster
  • Has a standard machine mix Vicat set of 14-24 minutes.
  • NOTE — For best results, store indoors in a dry, stable environment, away from drafts. Do not stack more than two pallets high.

DOWNLOAD usg-no1-pottery-plaster.pdf

Highly uniform, USG No. 1 Pottery Plaster is noted for outstanding performance and long life. The standard of the industry, it is the best material available for sanitary-ware and dinnerware slip casting.

Use 70% water for the weight of a given amount of plaster.

Buy 1 bag = (50lb).  in other words if you buy 50 you will get 2500 lbs!

Quantity93 OR

 How to mix Plaster:

1. Always weigh out the amount of plaster you need, then look up the water by weight percentage. For example USG # 1 Pottery for making molds uses 70% water to plaster. So 10 lb. of plaster requires 7 lb. of water. First weigh out the plaster you need, take that amount and multiply it by .7,(point 7), (7/10) this gives you how much water to use.

2. Generally speaking the larger the percentage of water the softer and more absorbent the plaster will be. The harder the plaster the less water used.

3. Hot water will speed up the set time and cold water will slow it down.

4. Place the water in a suitable sized container. Always add plaster to water. Pour the plaster into the water and let slake for one minute. Mix by hand or with a Jiffy Mixer, being careful not to suck air into the plaster. When the mixture is lump free it is ready to pour; don?t wait for it to start to thicken.

Warning WARNING: This product can expose you to chemicals including Silica, crystalline (airborne particles of respirable size), which are known to the State of California to cause cancer.  For more information go to