Fire-resistant filler sheet laminates
AssigneeWestinghouse Electric Corp.
InventorsHarold O. McCaskey, Melvin E. Benson
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Abstract
A fire-resistant laminate is made, comprising a plurality of heat and pressure consolidated thermoset resin impregnated filler sheets, where the filler sheets before resin impregnation comprised from about 60 wt. % to about 90 wt. % inorganic filler, up to about 25 wt. % cellulose fibers and from about 0.5 wt. % to about 20 wt. % resinous binder.
Claims7
A fire-resistant laminate comprising a plurality of thermoset resin impregnated filler sheets, the filler sheets before resin impregnation consisting of from about 60 wt. % to about 90 wt. % inorganic filler selected from the group consisting of aluminum trihydrate, magnesium silicate, magnesium hydroxide, magnesium carbonate, calcium silicate, calcium carbonate, mica, silica, and mixtures thereof, from about 5% up to about 25 wt. % cellulose fibers and from about 0.5 wt. % to about 20 wt. % resinous binder, the plurality of thermoset resin impregnated filler sheets being heat and pressure consolidated and bonded together into a unitary member, and having a resin ratio of from about 1.20 to about 4.0.
Dependencies are inferred from the claim text.