Editing Tin (section)

===Solder===
[[File:Ex Lead freesolder.jpg|thumb|left|A coil of lead-free [[solder]] wire]]
Tin has long been used in alloys with lead as [[solder]], in amounts of 5 to 70% w/w. Tin with lead forms a [[eutectic system|eutectic mixture]] at the weight proportion of 61.9% tin and 38.1% lead (the atomic proportion: 73.9% tin and 26.1% lead), with melting temperature of 183&nbsp;°C (361.4&nbsp;°F). Such solders are primarily used for joining [[plumbing|pipes]] or [[electric circuit]]s. Since the European Union [[Waste Electrical and Electronic Equipment Directive]] (WEEE Directive) and [[Restriction of Hazardous Substances Directive]] came into effect on 1 July 2006, the lead content in such alloys has decreased. While lead exposure is associated with [[Lead poisoning|serious health problems]], lead-free solder is not without its challenges, including a higher melting point, and the formation of [[Whisker (metallurgy)|tin whiskers]] that cause electrical problems. [[Tin pest]] can occur in lead-free solders, leading to loss of the soldered joint. Replacement alloys are being found, but the problems of joint integrity remain.<ref>{{cite journal| doi = 10.1289/ehp.113-a682| author = Black, Harvey|title = Getting the Lead Out of Electronics| journal = Environmental Health Perspectives|volume = 113|issue = 10|date = 2005| pmid = 16203230| pages = A682–5| pmc = 1281311}}</ref> A common lead-free alloy is 99% tin, 0.7% copper, and 0.3% silver, with melting temperature of 217&nbsp;°C (422.6&nbsp;°F).<ref>{{cite web |title=Technical data Sheet - Lead free alloy |url=https://docs.rs-online.com/e39d/0900766b81072bac.pdf |website=RS Online |access-date=18 June 2023}}</ref>