Hot-press Diamond Drill Bit Hardness and Rock Drill ability Grades Form

Hot-press Diamond Drill Bit Hardness and Rock Drill ability Grades Form

Rock Drillability Grade	Bit Hardness (HRC)	Rock classifications
1 – 4	15°, 20°, 22°~25°	Silty mudstone, carbonaceous mudstone, siltstone, medium- Grained sandstone, through amphibolite, lamprophyre, etc
5	20°, 22°~25°, 26°~28°	Silicified siltstone, talc through amphibolite, olive marble, white Marble, quartz diorite porphyry, black schist, diopside marble rock, Marble and so on
6	20°, 22°~25°, 26°~28°	Black hornblende plagioclase gneiss, white plagioclase gneiss, quartz, dolomite marble, black marble, mica, dolomite, alteration angle long glittering rocks, amphibolite granulite, amphibolite, biotite, quarz schist, angular rock, garnet diopside skarn, biotite dolomite marble, etc.
7	20°, 22°~25°, 26°~28°	White plagioclase gneiss, quartz and dolomite marble, diopside Pertrochemical diorite, mixed carbide powder rocks, biotite hornblende anorthosite, pyroxenite through, dolomite marble, Altered quartz diorite porphyry, quartz diorite, quarz biotite schist
8	30°~32°, 33°~35°	Granite, skarn diorite, garnet skarn, quartz diorite porphyry, quartz Amphibolite, biotite, amphibolite rocks, mixed pegmatite, biotite granite, plagioclase diorite, mixed gneiss, tuff, rock and other mixed light particles
9	30°~32°, 33°~35°	Carbide powder mixed rock, granite, plagioclase rock, mixed diorite, K-feldspar pegmatite, peridotite, plagioclase migmatites, diorite, quartz diorite, porpphyritic granite
10	30°~32°, 33°~35°	Silicified marble rocks, skarn, mixed-plagioclase gneiss, albite porphyry, feldspar pegmatite, amphilbolite rocks, felsic migmatitic amphibolite, anorthosite, granite, quartzite siliceous tuff lava gravel
11	5°~8°, 8°~10°, 10°, 15°, 22°~25°	Tuff, tufffused quartz chert, dacite, etc
12	5°~8°, 8°~10°, 10°, 15°, 22°~25°	Quartz chert, chalcedony, melting tuff, pure quartzite, etc