According to jpca-es-01-2003 standard, copper clad laminates with chlorine (C1) and bromine (BR) contents less than 0.09% wt (weight ratio) are defined as halogen-free copper clad laminates. (at the same time, the total amount of ci+br ≤ 0.15%[1500ppm])
Why ban bittern
Halogen refers to halogen group elements in the periodic table of chemical elements, including fluorine (f), chlorine (CL), bromine (BR) and iodine (1). At present, the flame retardant base materials, such as FR4 and CEM-3, are mostly brominated epoxy resins. Among brominated epoxy resins, tetrabromobisphenol A, polymerized polybrominated biphenyls, polymerized polybrominated diphenyl ether, and polybrominated diphenyl ether are the main barrier fuels of copper clad laminates, which are low-cost and compatible with epoxy resins. However, studies by relevant institutions have shown that halogen-containing flame-retardant materials (polybrominated biphenyls PBB: polybrominated diphenyl ether PBDE) will release dioxin (TCDD) and benzofuran (benzfuran) when they are discarded and burned. They have a large amount of smoke, unpleasant smell, highly toxic gases, cause cancer, and cannot be discharged after ingestion, which is not environmental friendly and affects human health. Therefore, the European Union initiated the prohibition of using PBB and PBDE as flame retardants in electronic information products. The same document of the Ministry of information industry of China requires that electronic information products put into the market should not contain lead, mercury, hexavalent chromium, polybrominated biphenyls or polybrominated diphenyl ethers and other substances by July 1, 2006.
The laws of the European Union prohibit the use of six substances such as PBB and PBDE. It is understood that PBB and PBDE are basically no longer used in the copper clad laminate industry. Bromine flame retardant materials other than PBB and PBDE are mostly used, such as tetrabromobisphenol A and dibromophenol. Their chemical formula is cishizobr4. This kind of copper clad laminate containing bromine as flame retardant is not regulated by any laws and regulations, but this kind of copper clad laminate containing bromine will release a large amount of toxic gases (brominated type) and have a large amount of smoke when burning or electrical fires; When PCB is used for hot air leveling and component welding, the plate will also release a small amount of hydrogen bromide under the influence of high temperature (>200); Whether dioxin will also be produced is still under evaluation. Therefore, FR4 board containing tetrabromobisphenol A flame retardant is not prohibited by law and can be used, but it cannot be called halogen-free board.
The above is the content that Xiaobian will introduce to you today. Welcome to call us for consultation and cooperation if necessary!
