1 This British Standard describes a method for carry-ing out etch inspection of metallic materials and com-ponents and describes some of the widely accepted etching solutions currently in use.
2 The materials covered by the standard are grouped as follows:
Ferrous metals
(1) Plain carbon, medium and low alloy steels.
(2) High alloy (corrosion and heat-resisting) steels. Non-ferrous metals
(3) Copper alloys.
(4) Aluminium alloys.
(5) Magnesium alloys.
(6) Titanium alloys.
(7) Nickel and cobalt base alloys.
BS M 37:1970 history
1970BS M 37:1970 Method for the etch inspection of metallic materials and components