Halogen is widely used in EE products, housing, adhesive, and so on.Whereas after the halogen compounds included electronic waste and plastics products burnt, may easy to result from so-called century poison－Dioxin-like Compounds, bring about the harm to health via the accumulation of organism. The international companies announced the Halogen-Free Standards in the end of 2006, clearly defined the Halogen-Free (Cl, Br) requirements within the products. Based on the IEC 61249-2-21:2003 standard. Per the IEC standard, restrictions on halogens apply only to Chlorine (Cl), Bromine (Br), and their compounds. No other halogen (Fluorine, Iodine, Astatine) is regulated.

Fluorine (F)

• Lemon yellow gas (F2), highly-corrosive, violent oxidizer, easy to make a chemical combination with other elements, and results from a large number of thermal energy
• Application：HF production, insecticide NaF production, plastic production, such as PTFE, Teflon, PFA, FEP, and so on

Chlorine (Cl)

• Green gas, violent oxidizer, easy to excite the human respiratory tract mucous membrane, may result in death when under critical condition.
• Application：Disinfectant and bleach production

Bromine (Br)

• Brown liquid results in serious harm when the skin has contact with it.
• Application：Disinfectant and bleach production, the flame retardant for plastic, radiocontrast agent, preservative, deodorant, and so on.

Iodine (I)

• Purple solid, the necessary trace elements within the organism.
• Application：iodine tincture production, filament production

Astatine (At)

• Solid, the artificial radioactive element.