User:Laurasmithhp/Halogen-Free

Overview
The halogens or halogen elements are a series of nonmetal elements from Group 17 IUPAC Style (formerly: VII, VIIA) of the periodic table, comprising fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). When talking about halogen-free the International Electrotechnical Commission's (IEC) definition includes references to only chorine and bromine.

Electronics Industry Standards
The term halogen-free does not necessarily indicated an absolute absense of halogens. The IEC has given specific allowances for the maximum ppm of chlorine and bromine by weight. That is, 900ppm by weight maximum of chlorine or bromine atoms, or a maximum of 1500ppm of both. JEITA quietly released their understanding (ET-7304) of what halogen levels are tolerable in halogen-free soldering materials, using a 1000ppm halogen limit.