American Society for Testing and Materials (ASTM). Current edition approved June 1, 2006. Published June 2006. Originally approved in 1976. Last previous edition approved in 2000 as B 613 – 76 (2000). 2 p. This guide defines the criteria for composition, properties, and other requirements for brushes containing a matrix of one or more conducting metallic elements or alloys and one or more lubricating lamellar solids