Halogen-free test

is halogen-free, which is actually a requirement for banning related halides in countries with strict environmental awareness. It is required that the average halogen (Cl, Br) content is less than 900 ppm respectively, and the total is less than 1500 ppm. If it exceeds this value, it is considered as non-compliance.
In fact, halogens (fluorine, chlorine, bromine, iodine) can be used to increase the ignition point when added to polymer products such as plastics. The advantage is that the ignition point is higher than ordinary polymer materials, and the ignition point is about 300°C. When burning, halogenated gases (fluorine, chlorine, bromine, iodine) are emitted, quickly absorbing oxygen, thereby extinguishing the fire.
However, its disadvantage is that when the concentration of chlorine released is high, the visibility is reduced and the escape route cannot be identified. At the same time, chlorine is highly toxic and affects the human respiratory system. In addition, when the halogen gas released by the combustion of halogen-containing polymers combines with water vapor, it will generate corrosive and harmful gases (hydrogen halide), causing corrosion to some equipment and buildings. In fact, excessive halogen content is harmful to some products and even to the human body.

The halogen compounds currently used in products mainly include: PBB, PBDE, TBBP-A, PCB, hexabromododecane, tribromophenol, short-chain chlorinated paraffin; they are also used in refrigerants, insulation materials, ozone-destroying substances CFCs, HCFCs, HFCs, etc., as well as various solvents, organic chemical raw materials, pesticides and insecticides, bleaches, wool degreasing agents, etc.
PBB, PBDE, TBBPA and other brominated flame retardants are currently commonly used flame retardants, mainly used in the electronic and electrical industries, including: circuit boards, computers, fuel cells, televisions and printers, etc. These halogen-containing flame retardant materials produce dioxins when burned, and they can exist in the environment for many years, or even accumulate in organisms for life, and cannot be discharged.

EU 2002/95/EC: Restriction of bromine-containing flame retardants
"Montreal Protocol": Restriction of 5 types of chlorofluorocarbons (CFCs) and 3 types of halons
"Stockholm Convention": Restrictions on the use of organochlorine pesticides, hexachlorobenzene (HCB), polychlorinated biphenyls (PCBs), polychlorinated dibenzo-p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs)
IEC 61249-2-21 (Regulations on Printed Board Materials): Restricted use of chlorine, bromine, and overall halogen