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The halogens are five non-metallic elements found in Group 7 of the periodic table. The term “halogen” means
“salt-former” and compounds containing halogens wire duct are called “salts”.
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The Halogens are: 
•  Fluorine 
•  Chlorine 
•  Bromine 
•  Iodine 
•  Astatine
In general as the term implies “halogen-free” means  the product material does not contain any compounds
derived from these elements. Many persons cable duct  in the electrical and electronic industry would give a definition of
“halogen-free” similar to what the IPC organization  (known as the Association Connecting Electronics
Industries) provided in a recent paper, “Electrical and electronic products may be considered ‘halogen-free’ if
they are assembled without the intentional use of these elements in the raw materials and these elements are
not intentionally present in the end product.”
    
This definition does not eliminate the potential for some unintentional
halogenated compounds to be present in the form of material impurities
or as the by-products of the production process. Test methods will
typically allow some small trace amounts of halogen to be present to
account for this incidental occurrence.
 In the electrical and electronic  industry confusion cable trunking does exist with
“halogen-free” terminology in part since the term is often associated with
environmental directives and manufacturer driven “green” product
initiatives. “Halogen-free” does not alone indicate that a product