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CMW® ELKONIUM 72 gold based alloy

Category Metal , Nonferrous Metal , Precious Metal , Gold Alloy
Manufacturer CMW Inc.
Trade Name ELKONIUM
Port Shanghai port,China
Trade Terms FOB, CFR, CIF
Payment Terms L/C, T/T, Western Union
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Material Notes:
Pure gold has complete resistance to atmospheric tarnish and oxidation. It does not contribute to polymer formations like platinum and palladium alloys. Wrought gold metal is very soft and prone to welding and has very few contact applications. Electroplated coatings of gold on silver and other base metals are used in dry circuit application and to provide long shelf life reliability. Gold is alloyed with other metals to improve hardness, contact performance, and reduce cost.ELKONIUM® 72 is the trademark used by CMW for a gold-silver-platinum alloy that is harder and more resistant to mechanical wear than ELKONIUM 70 alloy. It is completely resistant to atmospheric corrosion at normal temperatures, and is widely used in telephone relays and other sensitive switching devices. It offers good wear resistant and a low contact resistance when used as a brush contact and operated against other noble metal surfaces in sliding contact applications.Information provided by CMW Inc.
Physical Properties Metric English Comments
Density 16.0 g/cc
0.578 lb/in³
Mechanical Properties Metric English Comments
Hardness, Rockwell 15T 70
70
annealed
84
84
cold worked
Tensile Strength, Ultimate 276 MPa
40000 psi
annealed
414 MPa
60000 psi
cold worked
Component Elements Properties Metric English Comments
Gold, Au 69 %
69 %
Platinum, Pt 6.0 %
6.0 %
Silver, Ag 25 %
25 %
Electrical Properties Metric English Comments
Electrical Resistivity 0.0000156 ohm-cm
0.0000156 ohm-cm
11 % IACS
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