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Changes
→Silver-Metal Oxide Materials Ag/CdO, Ag/SnO2, Ag/ZnO
[[File:Micro structure of AgCdO9010ZH.jpg|right|thumb|Micro structure of Ag/CdO 90/10 ZH: 1) Ag/CdO layer 2) AgCd backing layer]]
Fig. 2.86: Micro structure of AgCdO 88/12 WP: a) perpendicular to extrusion direction b) parallel to extrusion direction
[[File:Micro structure of AgCdO8812WP.jpg|right|thumb|Micro structure of AgCdO 88/12 WP: a) perpendicular to extrusion direction b) parallel to extrusion direction]]
*Silver–tin oxide(SISTADOX)materials
Over the past years, many Ag/CdO contact materials have been replaced by Ag/SnO<sub>2</sub> based materials with 2-14 wt% SnO<sub>2</sub> because of the toxicity of Cadmium. This changeover was further favored by the fact that Ag/SnO<sub>2</sub> contacts quite often show improved contact and switching properties such as lower arc erosion, higher weld resistance, and a significant lower tendency towards material transfer in DC switching circuits ''(Table 2.30)''. Ag/SnO<sub>2</sub> materials have been optimized for a broad range of applications by other metal oxide additives and modification in the manufacturing processes that result in different metallurgical, physical and electrical properties ''(Table 2.29)''.
