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Printed circuit board
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== Legislation == {{Main|Restriction of Hazardous Substances Directive|China RoHS}} In many countries (including all [[European Single Market]] participants,<ref>{{cite web |title=EURLex β 02011L0065-20140129 β EN β EUR-Lex |url=http://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1399998664957&uri=CELEX:02011L0065-20140129 |url-status=live |archive-url=https://web.archive.org/web/20160107005501/http://eur-lex.europa.eu/legal-content/EN/TXT/?qid=1399998664957&uri=CELEX:02011L0065-20140129 |archive-date=January 7, 2016 |website=Eur-lex.europa.eu |access-date=July 3, 2015 }}</ref> the [[United Kingdom]],<ref>{{Cite web |date=December 4, 2012 |title=The Restriction of the Use of Certain Hazardous Substances in Electrical and Electronic Equipment Regulations 2012 |url=https://www.legislation.gov.uk/uksi/2012/3032/contents |website=legislation.gov.uk |access-date=March 31, 2022 }}</ref> [[Turkey]], and [[China]]), legislation restricts the use of [[lead]], [[cadmium]], and [[Mercury (element)|mercury]] in electrical equipment. PCBs sold in such countries must therefore use lead-free manufacturing processes and lead-free solder, and attached components must themselves be compliant.<ref>{{cite web |title=How Does Lead Affect Our Environment? |date=2019 |work=Pollutants and Toxicants: Environmental Lead (Pb) |publisher=Department of Environmental Quality, State of Michigan |url=https://www.michigan.gov/deq/0,4561,7-135-3307_29693_30031-90418--,00.html |archive-url=https://web.archive.org/web/20190419043337/https://www.michigan.gov/deq/0,4561,7-135-3307_29693_30031-90418--,00.html |archive-date=April 19, 2019 }}</ref><ref>{{cite web |work=RoHS Compliance Guide |title=FAQ on RoHS Compliance |url=https://www.rohsguide.com/rohs-faq.htm }}</ref> Safety Standard UL 796 covers component safety requirements for printed wiring boards for use as components in devices or appliances. Testing analyzes characteristics such as flammability, maximum [[operating temperature]], electrical tracking, heat deflection, and direct support of live electrical parts.
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