What is Halides
Halides are chemical compounds formed when halogens, such as chlorine and bromine, combine with other elements. These compounds play a significant role in various applications, including the production of PCBs.
Halogens are elements found in the 7th column of the periodic table, including fluorine, chlorine, bromine, iodine, and astatine. When these halogens react with other elements, they form halides. In the PCB industry, halides are used as flux activators and flame retardants for the PCB substrate.
As flux activators, halides enhance the high-temperature performance of fluxes used in soldering processes. They help to remove oxides from metal surfaces, ensuring proper wetting and solderability. Additionally, halides are used as flame retardants in PCBs, improving their fire resistance properties.
The use of halides, particularly bromide, as flame retardants in PCBs has raised health concerns. When burned, halogens can produce dioxin, a known carcinogen. As a result, efforts are being made to phase out the use of halogens in certain applications, and halogen-free alternatives are being sought.