1 Inorganic materials | |
| M-10 Steels and ferrous materials | |
| M-12 Non-ferrous metals and alloys | |
| | M-120 | Aluminium and its alloys | |
| | M-121 | Copper and its alloys | |
| | M-122 | Magnesium and its alloys | |
| | M-123 | Nickel and its alloys | |
| | M-124 | Zinc and its alloys | |
| | M-125 | Lead and its alloys (including Pb solders) | |
| | M-126 | Tin and its alloys (including Pb-free solders) | |
| | M-149 | Other non-ferrous metals and alloys | |
| M-15 Precious metals | |
| M-16 Non-metallic inorganic materials | |
| M-19 Other inorganics | |
2 Organic materials | |
3 Materials for product operation | |