Silver-cadmium oxide is a popular contact material that has been used in a wide range of applications in switches, relays and contactors for switching lamps, motors and resistive loads. Silver-cadmium oxide is a composite material consisting of a metal matrix, silver, with a metal oxide, cadmium oxide, dispersed throughout the matrix. Compositions of up to 30 % cadmium are made, but most applications use silver-cadmium oxide in the range of 10 to 15 % cadmium oxide by weight. Several different processes are used for manufacturing silver-cadmium oxide material and it should be understood that the manufacturing method has an influence on the properties of the material such as arc erosion resistance, welding resistance, arc mobility and contact resistance. Since the performance of contacts in a device is dependent on numerous factors outside the contact itself (opening speed, closing speed, contact pressure, contact bounce and many more device parameters), the guide cannot ensure performance in specific applications. Arc erosion resistance and welding resistance are improved by the addition of cadmium oxide to the silver matrix. The contact resistance is raised by this addition but still is low. Cadmium oxide and silver do not alloy so the silver matrix retains its high conductivity. Silver-cadmium oxide contacts are used in current ranges of a few amperes to several hundred amperes. Silver-cadmium oxide contact material is available as wire, silver-clad wire, sheet, strip, toplay, inlay and overlay sheet or strip, discrete contact parts, brazed contact assemblies, solid and composite rivet contacts and clad contact tapes. Materials with higher cadmium oxide contents have lower material costs but may have higher processing costs due to lower formability.1.1 This guide provides guidelines for users and manufacturers of silver-cadmium oxide material produced in strip, rod, wire, and part form for electrical contact applications. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Material Safety Data Sheet (MSDS) for this product/material as provided by the manufacturer, to establish appropriate safety and health practices , and determine the applicability of regulatory limitations prior to use.

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This specification covers an alloy containing palladium, silver, copper, platinum, and nickel in the form of wire, rod, and strip for electrical contacts. The materials shall be processed by cold working, heat treating, annealing, turning, grinding, and pickling. The material shall conform to the required chemical composition of palladium, silver, copper, platinum, and nickel. The alloys shall conform to the required mechanical properties such as tensile strength, elongation, Knoop hardness, and Vickers hardness.1.1 This specification covers an alloy containing palladium, silver, copper, platinum, and nickel in the form of wire, rod, and strip for electrical contacts.1.2 The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.1.3 The following precautionary statement pertains to the test method portion only, Section 7, of this specification: This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to become familiar with all hazards including those identified in the appropriate Safety Data Sheet (SDS) for this product/material as provided by the manufacturer, to establish appropriate safety, health, and environmental practices, and determine the applicability of regulatory limitations prior to use.1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

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1.1 This test method covers the determination of total iron in ores, concentrates, and agglomerates in the concentration range from 35 to 95% iron, and is free from vanadium interference. 1.2 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. 1.2.1 Use of safety goggles is required for fusion with sodium peroxide.

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