Deringer-Ney - Silver Cadmium Alloys

Silver Cadmium Alloys

The development of the silver cadmium alloys has produced a series of materials that provide good arc quenching characteristics, low contact resistance, and the ability to resist wear and arc erosion. These materials re used in both A.C. and D.C. applications in light to medium-heavy current ranges. The silver cadmium alloys are ductile and can be fabricated into all the contact forms.

DMC-55 (85% silver, 15% cadmium) is one of the standard materials and has been used in high current inrush applications such as motor starters.

DMC-54 (77% silver, 22.6% cadmium, .4% nickel) has been employed in D.C. Applications which require low surface resistance and the ability to reduce material transfer.

The other alloys listed offer varying degrees of electrical and physical properties.

Properties of Silver Cadmium Alloys

Deringer Material Number	Composition % by Weight	Density T.O./cu.in.	Hardness Range R 15T Scale	Tensile Strength x 1000 PSI	Electrical Conductivity % IACS	Melting Point F
DMCDMC-61	95 Ag, 5 Cd	5.48	40 - 76	31 - 56	60	1720
DMCDMC-56	90 Ag, 10 Cd	5.42	45 - 80	36 - 58	47	1670
DMCDMC-55	85 Ag, 15 Cd	5.37	51 - 83	38 - 68	35	1620
DMCDMC-54	77 Ag, 22.6 Cd, .4 Ni	5.28	50 - 85	35 - 68	31	1560

Note: Hardness values are for comparative purposes only and should not be used in design specifications.