Method for hydrating hemihydrate gypsum
US4906449A · kind A · utility
4Cited by
3References
4Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 13, 1988 |
| Grant date | Mar 6, 1990 |
| Priority date | — |
| Expiry date | Oct 13, 2008 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/00939
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
A gypsum mold having good water absorbing properties, which is suitable for cast molding pottery, can be prepared by stirring a mixture of hemihydrate gypsum cooled to -40.degree. to 5.degree. C. and water to form a slurry of gypsum in water having a temperature of -5.degree. to 10.degree. C., pouring it into a water-impermeable mold, maintaining it therein until the setting reaction thereof is completed and then releasing the set product from the mold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.