Abstract: A long wearing mechanical seal assembly comprising two paired sealing members of predetermined composition wherein the contacting surfaces are in rotating relationship with respect to one another, and wherein the members cooperate to prevent fluid flow between the contacting surfaces, a first one of said members being composed of a material suitable for a seal seat (e.g., cast iron, alumina ceramic or chrome plated steel) and the second member comprising a seal composed of a graphitic matrix that is filled with particulate, non-abrasive matter (e.g. Nepheline syenite, alpha-alumina or quartz) which is harder than the matrix and which has a microhardness greater than the matric to prevent the seal from wearing at the wear rate of the matrix.

Abstract: A long wearing mechanical seal assembly comprising two paired sealing members of predetermined composition wherein the contacting surfaces are in rotating relationship with respect to one another, and wherein the members cooperate to prevent fluid flow between the contacting surfaces, a first one of said members being composed of a material suitable for a seal seat (e.g., cast iron, alumina ceramic or chrome plated steel) and the second member comprising a seal composed of a graphitic matrix that is filled with particulate, non-abrasive matter (e.g. Nepheline syenite, alpha-alumina or quartz) which is harder than the matrix and which has a microhardness greater than the matrix to prevent the seal from wearing at the wear rate of the matrix.