ASTM B 664 - 90 (Reapproved 2006) Standard Specification for 80 % Silver-20 % Graphite Sliding Contact Material

American Society for Testing and Materials (ASTM). Current edition approved June 1, 2006. Published June 2006. Originally approved in 1979. Last previous edition approved in 2000 as B 664 – 81 (2000). 2 p. This specification defines the criteria for composition and other requirements for brushes with a nominal silver content of 80 %, by weight, with the balance being substantially graphite