Printed circuit board

According to JPCA-ES-01-2003 standard: Copper Clad Laminates（CCL） with chlorine (Cl) and bromine (Br) contents less than 0.09% wt (weight ratio) respectively are defined as halogen free PCB CCLs. (Meanwhile, total CI+Br ≤ 0.15% [1500 PPM]) Halogen free PCB materials include TU883 of TUC, DE156 of Isola, GreenSpeed® series, S1165/S1165M and S0165 of SYTECH, etc. Halogen refers to halogen elements in the periodic table of chemical elements, incLuding fluorine (F), chlorine (CL), Bromine (Br) and iodine (I). At present, the flame retardant substrates, such as FR4 and CEM-3, are mostly brominated epoxy resins. Relevant research shows that halogen-containing flame retardant materials (PBB: PBDE) will emit dioxin (TCDD), Benzfuran, etc. when they are abandoned and burned, which will cause cancer, cause a large amount of smoke, smell bad, and have high toxic gas, which can't be discharged after being ingested by human body, seriously affecting health. This is an important reason to promote the use of Halogen Free PCB. Therefore, six substances such as PBB and PBDE are prohibited by EU law. The document of China's Ministry of Information Industry requires that electronic information products put on the market should not contain lead, mercury, hexavalent chromium, polybrominated biphenyl or polybrominated diphenyl ether. This is the legal reason for promoting the use of Halogen Free PCB. It is known that PBB and PBDE are basically no longer used in the PCB industry, but bromine flame retardant materials other than PBB and PBDE, such as tetrabromodiphenol A, dibromophenol, etc., are more commonly used, and their chemical molecular formula is CISHIZOBr4.