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US 12,643,818 B2Granted
Plaster formula with increased porosity
AssigneeKnauf Gips KG
InventorsGuy L. Rosenthal, Christian Huch, Jeffrey F. Grussing, Pamela L. Hargrove
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Abstract
In one aspect, a pottery plaster formulation with increased water absorption, comprising alpha stucco, continuously-calcined-in-a-kettle stucco, and a combination of Rochelle salt and one or more of the following: potassium sulfate and/or a phosphate compound. In another aspect, pottery plaster molds with increased water absorption and methods of making and using the pottery plaster molds for slip casting ceramic items.
Claims16
A pottery plaster composition, wherein the pottery plaster composition is a dry mixture consisting of:
- 5-40 wt % alpha-calcined stucco;
- 60-94 wt % continuously-calcined-in-a-kettle (CCK) stucco;
- 0.02-0.2 wt % Rochelle salt;
- and
- 0.05-0.5 wt % at least one of the following:
- potassium sulfate and/or one or more phosphate compounds;
- and wherein the pottery plaster composition has a water absorption capacity of at least 10 wt %, calculated as an increase in pottery plaster weight measured in the full immersion test at 60 minutes.
4 more elements
Dependencies are inferred from the claim text.