Production of porous gypsum moldings

Details Production of porous gypsum moldings Production of porous gypsum moldings

1975-08-14

1977-08-09

Garvin, Patrick P.

Compositions: coating or plastic

Coating or plastic compositions

Metal-depositing composition or substrate-sensitizing...

106109, 106110, 106122, C04B 1100

Patent

active

040408507

ABSTRACT:
In the production of a gypsum-based porous body of high strength by foaming a gypsum-water mixture, the improvement which comprises including in said mixture about 0.1 to 1 part of a water-soluble aluminum compound per 100 parts by weight of gypsum, calcium oxide or calcium hydroxide in such a quantity that the final mixture has a pH-value in the range of about 10 to 13, a decomposition catalyst, and about 0.5 to 5 parts of hydrogen peroxide, expressed as a 35% solution, per 100 parts by weight of mixture, the ratio of solids to liquid being about 1 : 0.4 - 1.
The preferred aluminum compound is aluminum nitrate. The preferred decomposition catalysts are manganese compounds such as manganates or permanganates, e.g. potassium permanganate.

REFERENCES:
patent: 2662825 (1953-12-01), Kauffmann
patent: 3688437 (1972-09-01), Hamrin

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