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Silver Coating – Mil Spec: QQ-S-365C
White matte to very bright in appearance. Good corrosion resistance, depending on base metal. Silver coating will tarnish easily. Hardness varies from about 90 Brinnell to about 135 Brinnell depending on process and plating conditions. Solderability is excellent, but decreases with age. Best electrical conductor. Has excellent lubricity and smear characteristics for anti-galling uses on static seals, bushings, etc.
|Type / Grade||Comments|
|Grade A||With Supplementary tarnish resistant treatment|
|Grade B||Without Supplementary tarnish resistant treatment|
* Thickness is .0005” min. unless otherwise specified.
ASTM Designation: B 700
Grade A, Mat – Electrodeposits without luster.
Grade B, Bright – Electrodeposits obtained by the use of brighteners in the electroplating bath.
Grade C, Bright – Mechanical or chemical polishing of Grade A silver coatings.
Grade D, Semibright – The use of addition agents in the electroplating bath.
Supplementary Surface Treatment
Specify by Class in letter code as follows:
Class N – No supplementary tarnish treatment.
Class S – Supplementary tarnish treatment – not suitable for food service applications.
|Minimum for short-term shelf life solder-ability||1|
|Minimum for contact connectors having limited wear||2.5|
|Nominal thickness for thermo-compression bonding and nominal thickness for domestic hollowware||5|
|Medium-quality hollowware, short-life domestic cutlery and flatware, and suggested thickness for thermocompression bonding and die attachment for semiconductors||10|
|Normal hotel flatware and high-quality domestic flatware and hollowware||20|
|Applications where very severe wear resistance is required, such as machine bearings and for high-quality flatware||40|