Halogen test

Including fluorine (F), chlorine (Cl), bromine (Br), iodine (I), thorium (At), referred to as halogen. Since helium is a radioactive element, halogens are often referred to simply as: fluorine, chlorine, bromine, and iodine. Halogens are widely used in flame retardants, refrigerants, solvents, organic chemical raw materials, pesticides, bleaches, wool degreasing and so on.

Halogen compounds have a wide range of applications in the electronics industry. For example, chlorinated paraffin can be used as a plasticizer for plastic materials, and difluorodichloromethane can be used as a foaming agent in various plastics such as ABS, PS, PVC, and PU. However, the use of halogen compounds as flame retardants is most common. Common halogen flame retardants include brominated flame retardants such as PBB, PBDE, TBBP-A, and HBCDD, and short-chain chlorinated paraffins and chlorine-based flame retardants such as PCBs. The use of flame retardant can play a flame-retardant effect, and halogen-based flame retardants have less effect on the inherent physical and mechanical properties of the flame-retardant substrate. However, the use of halogen-based flame retardants also has a negative side: once a fire occurs, incomplete combustion of halogenated flame retardants will generate a large amount of carcinogenic substances; and the use of halogen-based flame retardant materials will generate a lot of smoke and when burning. Toxic corrosive gas, thus hindering the fire and evacuation of personnel, corrosion of instruments and equipment.

Halogen has great harm to the human body. In recent years, halogen-free requirements have become a significant trend in the development of the electronics industry. Although there is no unified regulatory requirement, relevant regulations will be introduced in the future. Therefore, as an enterprise, the use of halogen-containing materials should be reduced.

The control requirements for halogens started from the PCB industry and are now slowly expanding into more products and areas, typically from industry associations and brand companies. Although there is no direct national law to enforce control, it is often required to be enforced in a buyer-oriented supply chain.

Different industry specifications and internal corporate standards may place different requirements on halogens. In general, specific materials and components that require halogen control must be determined according to specific corporate standards.

 The halogen control in the general industry is chlorine (Cl) and bromine (Br). The specific limits are as follows:

Risk Analysis:

Halogen compounds are generally present in products in the form of organic compounds and are mainly used as flame retardants, refrigerants, fluxes, organic solvents, ozone-destroying substances for insulating materials, organic chemical raw materials, pesticides, bleaches, Wait. It is recommended that relevant companies strictly select raw materials and strengthen process control to avoid contamination during the production process.

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