Introduction
In applications ranging from networking and computer equipment to industrial machine controls, engineers and project managers are encountering new material requirements that are driving new offerings of alternative “halogen-free” wire management products. As environmental and other trends lead toward future growth of these products, confusion exists among those who must specify their use. What does “halogen-free” mean? Why is it important? And, in what applications is a halogen free product needed, now and in the future?
Halogen-free wiring duct has been available for quite some time and its use is expected to increase (along with other halogen-free products) over the coming years. This increase is driven by industry initiatives and legislation aimed at protecting the environment, by applications with enhanced fire safety needs and by applications requiring higher continuous use temperatures.
This paper will attempt to identify and shed light on several of the issues that arise in deciding when to specify a halogen-free wiring duct.
1. What does Halogen-free mean?
The halogens are five non-metallic elements found in Group 17 of the periodic table. The term "halogen" means "salt-former" and compounds containing halogens are called "salts".1
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 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 ......
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