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  • BSI
    BS 4393:1991 Specification for solderable tin or tin-lead coated wires for component terminations
    Edition: 1991
    $316.70
    / user per year

Description of BS 4393:1991 1991

This British Standard specifies requirements for the solderability, mechanical properties, sampling, packaging and materials of manufacture for tin and tin-lead coated wire. It applies to coated wire which is primarily intended for component leads in the electronics industry, where good solderability is the main criterion, and where the basis wire has a nominal diameter within the range 0.25 mm to 1.20 mm. A range of materials is specified for the basis wire.

Details of information to be supplied by the purchaser are given in appendix A.

The coating thickness range, necessary to achieve good solderability, is specified.

Test methods, particularly for use in cases of dispute, for the measurement of coating thickness, for the determination of the tin content of the coating and for the detection of lead in the coating are given in appendices B, C and D respectively. Appendix E gives the method for carrying out the bend test, which is used for assessing the robustness of the termination and for the coating adhesion.

NOTE 1. Guidance notes to assist the purchaser/user in the selection of the most appropriate basis wire and coating are given in appendix F.

NOTE 2. The titles of the publications referred to in this standard are listed on the inside back cover.



Requirements for solderability, mechanical properties, materials of manufacture, etc., for wires intended for component leads in the electronics industry, where solderability is a major criterion. It deals with wire in a range of materials, in the size range 0.25 mm to 1.20 mm.

Standard NumberBS 4393:1991
TitleSpecification for solderable tin or tin-lead coated wires for component terminations
StatusConfirmed
Publication Date1991-04-30
ReplacesBS 4393:1969
DescriptorsMarking, Electric wires, Tin, Chemical analysis and testing, Reverse-bend tests, Determination of content, Bend testing, Elongation values, Test equipment, Solderability testing, Electric conductors, Dimensions, Soldered connectors, Atomic absorption spectrophotometry, Thickness, Coated materials, Metal coatings, Electric terminals, Test specimens, Packaging
ICS29.060.10 Wires
CommitteeEPL/501
ISBN0 580 19185 0
PublisherBSI
Pages20

About BSI

BSI Group, also known as the British Standards Institution is the national standards body of the United Kingdom. BSI produces technical standards on a wide range of products and services and also supplies certification and standards-related services to businesses.
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