Tungsten-silver

[WAg 50/50 - 75/25]

Tungsten-silver (WAg) is a group of composite materials based on tungsten with approx. 50-75% W (remainder Ag). It combines the high hardness, high modulus of elasticity and wear and erosion resistance of tungsten with the very good electrical and thermal conductivity and corrosion resistance of silver. This makes WAg grades suitable for applications with electrical arc/spark loads, as contacts and electrodes and for components with good heat dissipation. The properties depend on the composition; below you will find a compact grade overview with typical characteristic values and links to material data sheets.

Grades & data sheets

Variety	Composition	Density	Hardness (HV10)	E-modulus (GPa)	Electrical conductivity (% IACS @20 °C)	Available as	Data sheet
WAg 50/50	W 50% / Ag 50%	13.6 ± 0.3 g/cm³	90 ± 30	190 ± 20	62 ± 3	Rods, bars, plates, tubes, finished parts	Material data sheet
WAg 65/35	W 65% / Ag 35%	14.9 ± 0.3 g/cm³	130 ± 30	240 ± 20	53 ± 3	Rods, bars, plates, tubes, finished parts	Material data sheet
WAg 70/30	W 70% / Ag 30%	15.2 ± 0.3 g/cm³	170 ± 20	250 ± 20	50 ± 3	Rods, bars, plates, tubes, finished parts	On request
WAg 75/25	W 75% / Ag 25%	15.5 ± 0.3 g/cm³	210 ± 30	270 ± 20	45 ± 3	Rods, bars, plates, tubes, finished parts	Material data sheet

The key features are as follows: ASTM B631, ISO 5182; contacts & electrodes

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Density: 15.0 g/cm³

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Electrical conductivity: ≈ 45-62 % IACS (20 °C, depending on variety) S/m

Supply programme

Rods, bars, plates, tubes and finished parts according to customer drawings

Properties

– High hardness, high modulus of elasticity, good wear/abrasion resistance (W content)
– Good electrical conductivity and heat dissipation, high corrosion resistance (Ag content)
– Density depending on grade approx. 13.6-15.5 g/cm³
– Electrical conductivity approx. 45-62 % IACS (20 °C), depending on grade
– Better machinability than pure tungsten

Applications

– Electrical contacts/switching contacts under spark/arc stress
– Resistance/spot-welding electrodes & inserts (ISO 5182)
– EDM/erosive contacts; components with good heat dissipation
– Precision components where hardness + conductivity are required

Do you need further information?

Specifications / standards

– ASTM B631 (Tungsten-silver – Contact materials)
– DIN EN ISO 5182 (Resistance welding – Materials for electrodes and auxiliary equipment)

Questions? We’re happy to help.

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