USG No. 1 Pottery Plaster (Discontinued)
SKU: 72192-5LB Brand: US Gypsum
$14.68
USG has stopped making No. 1 Pottery Plaster, and we have sold our last retail bags. In 2026, US Gypsum closed the Oklahoma plant that made No. 1, Hydrocal, Hydro-Stone and its other specialty plasters.
Our replacement is Arcosa Pottery Plaster, a pottery plaster for slip-casting molds made by Arcosa Specialty Materials. Mix it the same way as No. 1: 70 parts water to 100 parts plaster, by weight. How the two compare, and what to test before you switch.
About USG No. 1 Pottery Plaster
For decades No. 1 was the standard plaster for slip-casting molds: a porous, absorbent plaster that pulls water out of casting slip. USG's published figures: 70 parts water per 100 parts plaster, 2,400 psi dry compressive strength, 0.21% maximum setting expansion.
Mixing instructions: Instructions for Mixing Plaster.
Out of Stock!
If you would like to place an order for this back-ordered item,
please call us at 888.915.1196
Thank you!
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- Brand
- US Gypsum
- Type
- Dry Materials
- SKU
- 72192-5LB
- Weight
- 5.25 lb
- Availability
- Available to back-order
| SKU | Size | INVENTORY | ORDER ELIGIBILITY | PRICE |
|---|---|---|---|---|
| 72192-5LB | 5# Bag | Out of Stock | Please call | $14.68 |
| 72192-10LB | 10# Bag | Out of Stock | Please call | $26.50 |
*Back orders will be placed for order quantities exceeding that of on-hand inventory.
Questions & Answers
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Would your pottery plaster work well for making plaster wall hangings, Christmas ornaments and other decor items? I have used plaster of Paris but it seems rather fragile in the end product
Plaster by nature is fragile, I would recommend an air dry clay. It will be lighter and more sturdy. -
Is the #1 Pottery Plaster USG #1 Pottery Plaster?
Yes, this is USG #1 Pottery Plaster.