Halogen test

Including fluorine (F), chlorine (Cl), bromine (Br), iodine (I), astatine (At), halogen for short. Because astatine is a radioactive element, the halogens that people often say only refer to: fluorine, chlorine, bromine and iodine. Halogens are widely used in flame retardants, refrigerants, solvents, organic chemical raw materials, pesticides, bleaches, wool degreasing, etc.

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 is 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 the most common. Common halogen flame retardants include bromine flame retardants such as PBB, PBDE, TBBP-A and HBCDD, and chlorine flame retardants such as short-chain chlorinated paraffin and PCB. The use of flame retardants can achieve a flame retardant effect, and halogen flame retardants have less impact on the inherent physical and mechanical properties of the flame retardant substrate. However, the use of halogen-based flame retardants also has a downside: once a fire occurs, the incomplete combustion of halogenated flame retardants will produce a large amount of carcinogens; and materials using halogen-based flame retardants will produce a large amount of smoke and Toxic and corrosive gases, which hinder fire fighting and personnel evacuation, and corrode instruments and equipment.

Halogens are extremely harmful to the human body. In recent years, non-halogenation requirements have become a significant trend in the development of the electronics industry. Although there is currently no unified regulatory requirements, relevant regulations will definitely be introduced in the future. Therefore, enterprises should reduce the use of halogen-containing materials.

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

Different industry regulations and internal corporate standards may have different requirements for halogens. Generally, the specific requirements of the corporate standards are used to determine the specific materials or components that need to be controlled.

 Generally speaking, halogen control in the industry is chlorine (Cl) element and bromine (Br) element. The specific limits are shown in the following table:

Risk Analysis:

Halogen compounds generally exist in products in the form of organic compounds, and are mainly used as flame retardants, refrigerants, fluxes, organic solvents, ozone-depleting substances for heat insulation materials, organic chemical raw materials, pesticides, bleaching agents, Wait. It is recommended that relevant companies strictly select raw materials and strengthen process control to avoid pollution in the production process.