GeoGem Limited, manufacturer of high performance diamond drill bits for mining, civil engineering, geotechnical and oil industries
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CORE BIT SELECTOR

Technical Data Menu for Quick Navigation:
ROCK DESCRIPTION HARDNESS GEOTECHNICAL SURFACE SET BITS IMPREGNATED BITS
Saw
tooth
PDC Geo
Cube
Stones Per Carat Matrix Type
10/15 20/25 30/40 40/60 60/80 G2 G4 G6- G7 G8-G10
1 Chalk SOFT .
Claystone .
Gypsum .
Soft Limestone .
2 Loose Sandstone SOFT TO MEDIUM .
Marl .
Med Limestone . .
Salt . .
Sand .
Shale .
3 Claystone MED-HARD LOW ABRASIVE . .
Sandy Limestone .
Sandy Shale .
Soft Sandstone .
Soft Schist . . .
4 Hard Shale MED-HARD ABRASIVE . . . .
Med Limestone . . .
Med Sandstone . . .
Siltstone . . .
5 Hard Limestone HARD ABRASIVE . .
Schist . . .
Dolomites . . .
Serpentine . . .
6 Andesites HARD NON-ABRASIVE . . .
Diabase . . .
Dolomites . . . .
Hard Schist . . .
Magnetite . . .
Marble . . .
Pegmatites . . .
Siliceous Limestone . . .
Syenites . . .
7 Amphibolite VERY HARD .
Basalts .
Diorites .
Gabbro .
Gneiss .
Granites .
Leptite .
Metamorphic Schist .
Porphyry .
Quartzites .
Rhyolites .
Trachytes .
8 Cherts ULTRA HARD .
Conglomerate .
Jaspers .
Taconite .
Abrasive Sandstone . .
Abrasive Quartz . .


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GeoGem Limited, Unit 15, Colomendy Business Park, Denbigh, Denbighshire LL16 5TA, U.K.
Tel: 01745 815315   Fax: 01745 815495   Email: sales@geogem.co.uk
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