C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
18/1163, 261/72
C04B 11/00 (2006.01) C04B 28/14 (2006.01)
Patent
CA 1047052
ABSTRACT OF THE DISCLOSURE A modified calcium sulfate composition is disclosed which when hydrated possesses unique fracture properties of particular advantage when the material is used as a composition for making molds particularly for use in the lost wax process, the composition comprising, a) as a major constituent, calcined gypsum suitable for curing by hydration, b) as a minor constituent, extender capable of holding in the final composition a volume of water at least equal to the volume of the added extender, and c) as a minor constituent, water dispersible binder capable of enhancing the adherence of the added ex- tender in the final composition to the hydrated gypsum, the constituents being present in proportions selected to impart rigidity and a smooth surface to the cured composition while producing a strength under compression of less the 500 psi.
192786
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