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Specification of Diamond core Bit
Jan 09, 2018

  

Rock Group

Formation Hardness

Abrasiveness

Rock

Bit Matrix Range

1-4

Soft

Medium

Clay,shale,very soft sandstone,marl argillite,volcanic tuff,etc.

HRC45-50

HRC40-50

5-7

Medium -hard

Low

Medium

High

Limestone,rhyolite lava,andesite,marble,hard sandstone,limonite,dolomite,schist,etc.

HRC40-50

HRC35-40

HRC30-35

8

Hard

Low

Medium

High

Basalt,gneiss,granodiorite amphibololite,pegmatite,diabase,etc.

 

HRC30-35

HRC25-30

9-10

Very Hard

Low

Medium

High

Hard granite,quartzitic conglomerate,quartzite hard,slate,rhyolite,etc.

HRC20-25

HRC15-20


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