Patent ID: 7498374

Claim:
A composite material comprising: from about 50 wt % to about 75 wt % (based on total weight of the composite material) of inorganic material, wherein the inorganic material comprises from about 30 wt % to about 50 wt % (based on weight of the inorganic material) of a first inorganic filler having an average particle size ranging from about 0.5 mm to about 5 mm; and from about 50 wt % to about 70 wt % (based on weight of the inorganic filler) of a second inorganic filler having an average particle size ranging from 0.02 mm to about 0.1 mm, and from about 25 wt % to about 50 wt % (based on total weight of the composite material) of a thermosetting polymeric resin.