Patent ID: 7846480

Claim:
A lightweight carrier granule comprising 32-48 weight-% of wood fibers having a bulk density of less than 20 pounds per cubic foot, wherein said wood fibers range from 10 microns to 2 millimeters in length and at least 35 weight-% of said fibers are retained on a 50-Mesh U.S. Sieve Series screen, 52-65 weight-% mineral filler having a particle size range within the range 10 to 500 microns, and 3-7 weight-% binder, wherein said granule passes through a 10-Mesh U.S. Sieve Series screen and is retained on a 40-Mesh U.S. Sieve Series screen, said granule has a moisture content of less than 5 weight-%, said granule has a Resistance to Attrition of at least 95%, and said granule has a bulk density of 26 to 30 pounds per cubic foot.