 1 Inorganic materials |  |
| M-10 Steels and ferrous materials | |
| | M-100 | Stainless steel | |
| | M-101 | Cast and sintered irons | |
| | M-119 | Other ferrous alloys, non-stainless steels | |
| M-12 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 | |