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Composites Typical Properties

Additional values are available on this table.

Mi-Tech	RWMA Group B	Nominal Composition % Weight	Rockwell Hardness	Electrical Conductivity % IACS	Ultimate Tensile Strength PSI	Cross Breaking Strength PSI	Density g/cc	Typical Resistance Welding Applications
CW55		55% Tungsten 45% Copper	79 B	55	63,000	110,000	12.50	Flash and butt welding die inserts requiring high electrical and thermal conductivity.  Electrode facings for the welding of stainless steel.
CW68		68% Tungsten 32% Copper	88 B	52	75,000	130,000	13.93	Flash and butt welding die inserts requiring high electrical and thermal conductivity.  Electrode facings for the welding of stainless steel.
CW70E		68% Tungsten 32% Copper	88 B	52	75,000	130,000	13.93	Flash and butt welding die inserts requiring high electrical and thermal conductivity.  Electrode facings for the welding of stainless steel.
CW70		70% Tungsten 30% Copper	90 B	50	85,000	140,000	14.18	Light duty projection welding dies where weld pressures are medium to light.
CW75	Class 11	75% Tungsten 25% Copper	94 B	48	90,000	150,000	14.70	Used for facing and inserts for flash and butt welding dies, projection welding electrodes, seam welding bearing inserts, facings for electro-forming and electro-forging dies. Often used for EDM electrodes for greater wear ratios.
CW78	Class 11	78% Tungsten 22% Copper	96 B	46	94,000	160,000	15.12	Used where a slightly harder material is required for the same applications as CW75.
CW80		80% Tungsten 20% Copper	98 B	44	96,000	170,000	15.56	Heavy duty projection welding electrodes, die facing for electro-forming and electro-forging, also facings for upsetting of rivets & studs.
TC50		50% Tungsten-Carbide & 50% Copper	94 B	47	70,000	140,000	11.27	Light duty projection welding dies where pressures are not extreme but where abrasion may be encountered.
TC56		56% Tungsten-Carbide & 44% Copper	99 B	42	75,000	160,000	11.67	Where abrasion is encountered for heavy-duty projection welding electrode and die facings for electro-forming and electro-forging.
TC70		70% Tungsten-Carbide & 30% Copper	37 C	30	85,000	180,000	12.60	An extremely hard material highly resistant to wear, for electro-forging and upsetting. Impractical to machine and should be ground.