 1 Inorganic materials |  |
| 2 Organic materials | |
| M-20 Unfilled thermoplastics resin | |
| M-25 Filled thermoplastics resin | |
| M-30 Duromers | |
| M-32 Elastomers | |
| M-34 Natural materials | |
| | M-340 | Wood | |
| | M-341 | Paper | |
| | M-342 | Fiber | |
| | M-343 | Leather | |
| M-39 Other organics | |
| 3 Materials for product operation | |