GUIDE TO THE SELECTION OF THE IMPREGNATED DIAMOND BITS
| Series | Rock Types | Formation Characteristics | Rock Hardnes (Mohs) |
|---|---|---|---|
| S2 / S3 | Serpentinite, Sandstone, Limestone, Gypsum, Calcite, Shale, Talc | Soft, Very Abrasive, Fractured | 4 / 5 |
| S4 / S5 / S6 | Greenstone, Dolomite, Andesite, Basalt | Medium Hard, Moderately Abrasive, Fractured | 6 |
| S7 / S8 | Pegmatite, Peridotite, Gabbro, Schist, Norite | Hard, Moderately Abrasive, Compact | 7 |
| S9 / S10 | Quartzite, Rhyolite, Granite, Gneiss, Diorite | Hard – Very Hard, Non-Abrasive, Compact | 8 |
| S11 / S12 | Talconite, Jasperite, Quartz, Chert | Ultra Hard, Non-Abrasive, Compact | 9 |
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