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The hardness of the abrasives

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| Sand blaster |
The hardness of the abrasives
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Sound index |
| ÂÌ1, ÂÌ2 | very soft | |
| Ì1, Ì2, Ì3 | soft | |
| ÑÌ1, ÑÌ2 | middle soft | |
| Ñ1, Ñ2 | medium | 31, 33 |
| ÑÒ1, ÑÒ2, ÑÒ3 | middle hard | 35, 37 |
| Ò1, Ò2 | hard | 37, 39 |
| ÂÒ1, ÂÒ2 | very hard | 39 |
| ×Ò1, ×Ò2 | extremely hard | 41 |
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