ASTM standard is expressed by code, alphabet classify code, number, year, English name. alphabet M after number is metric unit standard, it is English unit standard, year in the bracket after making year is reconfigured year for standards, alphabet after making year is amendment edition, alphabet means: A black metal, B nonferrous metal C cement, ceramic, concrete tile, D other material, E miscellany, F special usage material(electric material, vibration-proof material, medical material), for those corrosion, metamorphic, degradation.