Silver tungsten materials

Silver tungsten materials are used in industrial and domestic circuit breaker applications where good weld and erosion resistance is important. Various grades are available: - the higher silver grades have higher conductivity, and the higher tungsten grades have greater erosion and weld resistance.

High contact pressures are required to ensure effective operation if used for frequent high current switching, where mixed oxides of silver-tungsten can be formed, giving high contact resistance.

Silver tungsten data sheet

Grade	Ag%(WT)	W%(WT)	Density (Min)	Electric Conductivity (Min)	Hardness (Min)
AgW55	45±2	Balance	13.55g/cm3	58%IACS	115HB
AgW60	40±2	Balance	14.00g/cm3	56%IACS	125HB
AgW65	35±2	Balance	14.50g/cm3	53%IACS	135HB
AgW70	30±2	Balance	14.90g/cm3	51%IACS	150HB
AgW75	25±2	Balance	15.40g/cm3	48%IACS	165HB
AgW80	20±2	Balance	16.10g/cm3	45%IACS	180HB

Silver WC data sheet

Grade	Ag%(WT)	WC%(WT)	Density (Min)	Electric Conductivity (Min)	Hardness (Min)
AgWC50	50±2	Balance	12.20g/cm3	29%IACS	85HRB
AgWC40	60±2	Balance	11.70g/cm3	34%IACS	72HRB
AgWC30	70±2	Balance	11.20g/cm3	36%IACS	57HRB