Composite material and method of producing

Details Composite material and method of producing Composite material and method of producing

1991-10-15

1994-06-14

Lewis, Michael

Compositions: coating or plastic

Coating or plastic compositions

Inorganic settable ingredient containing

106772, 156 42, 423555, 428703, B32B 1302, C01D 500

Patent

active

053206770

ABSTRACT:
An improved composite material is produced by mixing gypsum and host particles of a stronger substance, such as wood fibers, in a dilute slurry; heating the slurry, under pressure, to convert the gypsum to calcium sulfate alpha hemihydrate; and substantially dewatering the hot slurry before rehydrating the hemihydrate back to gypsum. The resulting material is a homogoneous mass comprising gypsum crystals physically interlocked with the discrete host particles.
According to a further aspect of the invention, an improved wallboard, having fire resistance, dimensional stability and excellent strength properties, is produced by compressing the composite mass before hydrating it to a final set.

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