c) Sheet metal weights (500 mg to 1 mg). 1.2 It does not cover proportional weights that are used, for instance, incertain types of weighing machines, weigh-bridges, etc.
2 References
IS 210 : 1993 Grey iron castings - Specification
IS 292 : 1983 Leaded brass ingots and castings
IS 306 : 1983 Tin bronze ingots and castings
IS 319 : 1989 Free-cutting leaded brass bars, rods and sections
IS 410 : 1977 Cold rolled brass sheet, strip and foil
IS 737 : 1986 Wrought aluminium and aluminium alloy sheet and strip for general engineering purposes
IS 1570 : Part 5 : 1985 Schedules for wrought steels: Part 5 Stainless and heat resisting steels
IS 1977 : 1996 Low tensile structural steel - Specification