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It is not only the extreme hardness of superhard tool materials but also their high heat-resistance which enables highest cutting rates and increased productivity. Of disadvantage, however, is their low toughness. Economical application is only possible on extremely rigid machinges and for a specific range of application.

Guhring description	Classification	Range of application	Hardness		Bending strength N/mm2	Grain size
			HV30	Knoop
	TCN54 P15/P20	high cutting edge stability, for finishing tools such as reamers	1650	-	1900	< 2,5 µm
	Si3N4	extremely heat-resistant, for dry machining cast materials	1560	-	1000	< 4 µm
	DB-CT010	predominantly for machining aluminium alloys, highest accuracy and surface quality	-	68GPa	-	< 10 µm
	DBC-80	predominantly for machining hardened steels	-	32GPa	-	< 2 µm

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