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| Silver | Mil Spec | Thickness | Comments |
| 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. |
Grade B |
.0005” min. unless otherwise specified. | Increasing use in both decorative and engineering fields, including electrical and electronic fields.
Matte |
ASTM Designation: B 700
Electrodeposited Coatings of Silver for Engineering Use
Classification
Purity:
Type 1 – 99.9% min.
Type 2 – 99.0% min.
Type 3 – 98.0% min.
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.
Application |
Thickness, µM |
For short-term life solderability |
1 |
For contact connectors having limited wear |
2.5 |
Thickness for thermocompression bonding and nominal thickness for domestic hollowware. |
5 |
Hotel quality flatware, and suggested thickness for thermocompression bonding and die attachment for semiconductors |
10 |
High quality European hotel flatware and hollowware |
20 |
Applications where very severe wear resistance is required, such as machine bearings and for high-quality flatware. |
Greater than or equal to 40 |
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