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Silver tin oxide

Materials

EFO

EMO

EMB

CCB

Oxide content (% massic)

10

8 - 10 – 12

8 – 10 - 12 – 14

12 - 14

SnO2 grain size

< 0,5 μ

2 to 5 μ

SnO2 grain shape

Granular

Manufacturing process

Sintered – Extruded

Die Compacting

NB : Alloys with 2, 3.3 or 5 % oxide are also available on special order.

Designation

METALOR manufactures a wide range of material and so a detailed description is essential, which must include :

AgSnO2

  • 1st letter : Manufacturing process : Extrusion or die Compacting
  • 2nd letter : Medium, Fine, Chemical (the grain size is defined by the chemical process)
  • 3rd letter : O without doping agent, B for Bismuth oxide
  • 8-10-12-14 for total oxides content

E

M

B

8

Characteristics

EFO

EMO

EMB

CCB

Oxide content (% massic)

10

8

10

12

8

10

12

14

12

14

Theorical density g/cm³

9.98

10.08

9.98

9.88

10.12

10.03

9.95

9.87

9.95

9.85

HV1 (annealed)

95

55

60

65

60

65

70

75

95

105

IACS (%)

80

87.5

83

78

88

82.5

78.5

74

80

72

NB : Please contact us if you require material of different composition

Delivery conditions

EFO

EMO

EMB

CCB

Oxide content (% massic)

10

8

10

12

8

10

12

14

12

14

Wire

X

X

X

X

X

X

Profile

X

X

X

X

X

X

X

X

Tip

X

X

X

X

X

X

X

X

X

X

NB : Please contact us if you require material of different composition

Assembly

h is between 10 and 30 % of H

Brazing alloys

Resistance brazing

Flame brazing / Induced current brazing

Ag 150 / Cu 800 / P 50

Ag 550 / Cu 210 / Zn 220 / Sn 20

or any other type of brazing alloy compatible with the assembly

Electrical test results

Comparison of the characteristics of AgSnO2and AgCdO

Erosion AC4 50A

Contact resistance AC3 12A

Welding force AC3 50 A

Erosion of all bridges

Electrical tests performed on test machines or on switchgear (IEC 947 standard) confirm the excellent resistanceagainst erosion and the low welding tendency of AgSnO2 as compared with AgCdO. Temperature rise is similar.

The advantages of AgSnO2 are even more significant for capacitive application or for direct current.

Applications

Application field

Any type of switchgear requiring breaking capacity in AC or DC at 10 to 1 000 A and 24 to 600 V.
This material is recommended for its low welding tendency and for its resistance stability when subjected to intense make and break cycles.

Switchgear type

  • Relays
  • Contactors
  • Engine starters
  • Breakers

Uses

  • Industrial automatisms
  • Transport : cars, railways
  • Lifts, forklift trucks
  • Regulating devices, thermostats

Others conditions

We manufacture according to customer specification.
The radius, spherical shapes, tip thickness and brazing characteristics are defined in cooperation with the customer.