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Electrical Contact Materials

Electrical contact material selection is determined by the specific application. Brainin experts can help select the best materials for your electrical contact requirements.

Approximate Hardness

Material

Density (g/cm3)

Electrical Conductivity (%IACS)

Annealed 15T

Hard 15T

Desirable Properties

Typical Applications

Fine Silver 99.9Ag

10.51

105

30

75

Highest electrical and thermal conductivity, low contact resistance, operates at low contact force Appliance and heating thermostats, light duty switches and controls (AC and DC)
Silver Cadmium Oxide 90Ag,10CdO 86.5Ag,13.5CdO 85Ag,15CdO

10.33 10.19 10.06

82 76 72

53 54 55

75 76 77

High conductivity, arc quenching properties, resists sticking, low arc erosion, high current carrying capability Medium to heavy duty switches and controls, wall switches, motor starters, DC switches and relays, AC and DC circuit breakers, motor protectors
Silver Tin Oxide 92Ag,8SnO2 90Ag,10SnO2 88Ag,12SnO2

10.08 9.95 9.79

86 82 77

56 60 66

73 77 82

High conductivity, resists sticking, very low arc erosion, high current carrying capability Automotive switches and relays, medium to heavy duty switching devices
Silver Nickel 90Ag,10Ni 85Ag,15Ni

10.33 10.23

89 82

51 53

72 73

High conductivity, resists sticking, operates at fairly low contact force Medium duty AC switches and relays, general purpose switching devices
Coin Silver 90Ag,10Cu

10.31

85

70

84

Increased hardness, lower cost Automotive switches and relays, sliding contacts, light duty switches and controls
75Ag,24.5Cu,0.5Ni

10.00

75

78

88

Low cost, increased hardness even at high operating temperatures, low material transfer Automotive and other low voltage DC devices
85Ag, 15Cd

10.17

35

45

84

Increased hardness, low material transfer, resists sticking Automotive relays, DC motor controls and other DC devices with high surge currents
90Ag, 10Pd

10.57

27

63

80

Low contact resistance, operates with low con-tact force, resists sulfide formation Light duty relays, alarms, AC and DC devices
72Ag, 28Cu

9.95

84

79

85

Low cost, relatively low contact resistance, good machining and spring properties Medium duty relays and switches
90Ag, 10Fe

10.19

90

54

74

High conductivity, resists sticking, low contact resistance Thermostats, light force medium duty switches
75Au, 25Ag

17.31

16

45

77

Low contact resistance, operates with low contact force, resists oxidation and other film formation Connectors, dry circuit to light duty relays and switches, high reliability devices
69Au, 25Ag, 6Pt

15.92

10

70

84

Excellent corrosion resistance, excellent wear resistance Dry circuit to light duty switches and relays, sliding contacts, high reliability devices
35Pd, 30Ag, 10Au, 10Pt, 14Cu, 1Zn

11.63

5

90

94

Age hardened brush alloy, excellent wear resistance, very good corrosion resistance Sliding contacts, potentiometers
44Pd, 38Ag, 16Cu, 1Pt, 1Ni

10.80

6

90

94

Age hardened brush alloy, excellent wear resistance, good corrosion resistance Sliding contacts, potentiometers