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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. 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/GradeComments

Type I Matte
Type II Semi-Bright
Type III Bright
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

Surface Appearance

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.

Thickness

ApplicationThickness, µm

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

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