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An analysis of the current status of lead-free soldering.

Richards, B; Levoguer, C L; Hunt, C; Nimmo, K*; Peters, S*; Cusack, P* (1999) An analysis of the current status of lead-free soldering. NPL Report. CMMT(A)170

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Lead (Pb) is a major constituent of solder which is used extensively within electrical and electronic equipment and there are environmental concerns over the amount ending up in land-fill. As a result attention has been increasingly focused on the potential of Pb-free soldering which can also provide improved reliability and mechanical strength. Some major companies are already using the green image of Pb-free products to promote their products successfully.
The publication in 1998 of the second draft of a proposal for an EC Directive on WEEE (Waste from Electrical and Electronic Equipment) has brought about a sharp focusing of attention. Although principally about recycling, the draft contains clauses aimed at banning the use of Pb in certain categories of electrical and electronic equipment. There is also a proposal to ban halogenated flame retardants used in the manufacture of the bare circuit boards and equipment housings.
The drive to reduce the level of use of hazardous materials is not new of course. For example lead in domestic water pipes and plumbing solders, petrol, paint and fishing weights etc has long been the centre of environmental and green pressures.

Item Type: Report/Guide (NPL Report)
NPL Report No.: CMMT(A)170
Subjects: Advanced Materials
Advanced Materials > Electronics Interconnection
Last Modified: 02 Feb 2018 13:18
URI: http://eprintspublications.npl.co.uk/id/eprint/1301

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