Patent ID: 7448941

Claim:
An apparatus to test abrasion resistance of materials, comprising: a conduit; an air stream generating device to generate an air stream in the conduit; and a device to deposit particulate into the conduit so that the air stream blows the particulate toward a test sample positioned in the conduit, wherein the air stream comprises a primary air stream and a secondary air stream and wherein the air stream generating device comprises a first air stream generating device to generate the primary air stream and a second air stream generating device to generate the secondary air stream; a diffuser located within and joined to the conduit to release particulate into the primary air stream so that the density of particulate in the primary air stream is substantially uniform; and wherein the diffuser has a plurality of openings, each opening being at a particular height with respect to a test sample such that the opening at the greatest height allows particulate to strike an upper portion of the test sample, an opening at a height lower than the greatest height allows particulate to strike a middle portion of the test sample, and an opening at a lowest height allows particulate to strike a lower portion of the test sample.