Halogen-free printed circuit board base materials are fully compliant with RoHS environmental protection directives, and they belong to upgraded eco-friendly electronic substrate materials that meet both basic RoHS restrictions and higher-level international green manufacturing standards. The core definition of halogen-free materials is that the mass content of chlorine, bromine, fluorine, iodine and astatine in the raw material formula is strictly controlled within international specified limits, among which chlorine content is less than 900ppm, bromine content is lower than 900ppm, and total halogen content does not exceed 1500ppm, completely eliminating high-halogen flame retardant components such as polybrominated diphenyl ethers and polybrominated biphenyls that are explicitly restricted by RoHS regulations.

RoHS directive mainly restricts six harmful substances including lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls and polybrominated diphenyl ethers in electronic and electrical products, focusing on prohibiting heavy metal pollution and toxic flame retardant hazards. Traditional ordinary FR4 substrates often adopt halogen-containing brominated flame retardants to achieve fire resistance, which can basically meet the lowest threshold requirements of RoHS, but will release toxic and corrosive halogen-containing harmful gases when encountering high temperature combustion, causing secondary pollution to the environment and potential hidden dangers to equipment maintenance personnel. As an optimized environmental protection material, halogen-free PCB substrates abandon all halogen-based flame retardant formulas, and adopt phosphorus-nitrogen composite inorganic flame retardant systems to achieve stable flame retardant effect while completely avoiding all restricted harmful substances stipulated in RoHS.

In actual industrial production and international trade certification, all halogen-free board products can smoothly pass RoHS official detection and certification, and also simultaneously meet stricter environmental regulations such as REACH, HF and green product procurement standards of mainstream electronic brands. In addition to satisfying RoHS basic compliance requirements, halogen-free PCB materials have more superior practical application performance: they produce low smoke density and non-toxic smoke gas during combustion, which is conducive to emergency escape in closed electronic equipment working scenes; their material chemical stability is stronger, not easy to undergo chemical decomposition and aging under high temperature and humid environment, effectively delaying circuit board yellowing, delamination and insulation performance decline. At present, global electronic manufacturing industries such as consumer electronics, automotive electronics, new energy power equipment and communication base station circuits have fully popularized halogen-free PCB materials. It has become the basic environmental standard for export electronic products to use halogen-free substrates that meet RoHS specifications, which not only meets international environmental access thresholds, but also promotes the green upgrading and sustainable development of the entire electronic circuit manufacturing industry chain.