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| Material Designation | Standard | Same grade, different standards. | Source factory |
|---|---|---|---|
| Кр3 | GOST 2169-1969
Non-metallic materials |
- | |
| Кр2 | GOST 2169-1969
Non-metallic materials |
- | |
| Кр1 | GOST 2169-1969
Non-metallic materials |
- | |
| Кр00 | GOST 2169-1969
Non-metallic materials |
- | |
| Кр0 | GOST 2169-1969
Non-metallic materials |
- |