BS 4290:1989

Foreword
Committees responsible
Method
1 Scope
2 Definitions
3 Information to be supplied by the purchaser to the
   electroplater
4 Basis material
5 Coating classification code
6 Undercoats
7 Coatings
8 Anti-tarnish treatments
Tables
1 Summary of information required
2 Appropriate undercoats for use with silver and silver
   alloy decorative and protective coatings
3 Recommended range of silver coatings

Electrodeposited coatings on metallic and non-metallic materials for general and protective purposes. Excludes coatings containing less than 95% pure silver by mass or of minimum thickness less than 2 μm, and those on screw threads or unfabricated sheet or strip.

This British Standard describes a method for specifying requirements for electrodeposited coatings of silver and its alloys on metallic and non-metallic materials for decorative and/or protective purposes.

This standard is not applicable to:

1. coatings on screw threads;
2. coatings applied on sheet or strip in the unfabricated form;
3. coatings containing less than 95 % by mass of pure silver; or
4. coatings of minimum thickness less than 2 µm.

NOTE. The titles of the publications referred to in this standard are listed on the inside back cover.