Halogen-containing flame-retardant materials, such as PBB and PBDE, generate toxic substances like dioxins and benzofurans when burned. These substances pose a severe threat to human health. Moreover, during the combustion process, a large amount of toxic gases and thick smoke are released, causing environmental pollution. In contrast, halogen-free PCB circuit boards produce fewer harmful substances during production and use, meeting environmental protection requirements. Additionally, they do not generate toxic gases when burned, which is beneficial for environmental protection and human health.
In today's era of rapid technological advancement and widespread popularity of electronic products, PCBs (Printed Circuit Boards), as the core components of electronic devices, have drawn significant attention regarding their performance and safety. The emergence and promotion of halogen-free PCBs are in line with the high demands of the times for environmental protection and health. The following will elaborate in detail on why halogen-free PCBs are necessary from multiple aspects.
Traditional PCBs typically employ halogen-containing flame retardants, such as polybrominated biphenyls (PBBs) and polybrominated diphenyl ethers (PBDEs). These halogen-containing flame retardants are relatively stable at room temperature and can provide good flame-retardant effects, ensuring the safety of PCBs during normal use. However, once PCBs are exposed to high-temperature combustion situations like fires, the halogen-containing flame-retardant materials undergo complex chemical reactions, generating a series of toxic and harmful substances.
Among them, dioxins and dibenzofurans are typical toxic substances produced during the combustion of halogen-containing PCBs. Dioxins are a class of highly toxic organic compounds, known as "one of the most toxic substances on Earth." They have strong carcinogenic, teratogenic, and mutagenic effects and can accumulate in living organisms over the long term, becoming enriched through the food chain and causing severe damage to the human immune system, reproductive system, and endocrine system. Dibenzofurans are also toxic and can adversely affect the human nervous system, respiratory system, and liver.
In addition to producing toxic substances like dioxins and dibenzofurans, halogen-containing PCBs release a large amount of toxic gases during combustion, such as hydrogen chloride (HCl) and hydrogen bromide (HBr). These gases are highly irritating and corrosive, causing severe harm to the human respiratory tract, eyes, and skin. When people inhale these toxic gases at a fire scene, they may experience symptoms such as coughing, difficulty breathing, and eye pain, and in severe cases, it can even lead to suffocation and death.
At the same time, halogen-containing PCBs produce thick smoke during combustion. The thick smoke not only reduces visibility at the fire scene, posing great difficulties for rescue work, but also contains a large number of particulate matter and harmful gases, further exacerbating the impact on human health and the environment.
The toxic substances and gases released during the combustion of halogen-containing PCBs not only cause direct harm to personnel at the fire scene but also result in long-term environmental pollution in the surrounding areas. These toxic substances can spread into the soil, water sources, and atmosphere through air and water flow, disrupting the ecosystem. For example, dioxins and other substances are difficult to degrade in the soil and can remain in the soil for a long time, affecting soil fertility and microbial activity, and thereby impacting crop growth and quality. Moreover, these toxic substances can enter living organisms through the food chain, posing potential threats to the health of wildlife and humans.
Halogen-free PCBs use non-halogen flame retardants, such as phosphorus-based and nitrogen-based flame retardants, during the production process. These non-halogen flame retardants do not produce toxic by-products like halogen-containing flame retardants during production, reducing environmental pollution during the production process and harm to workers' health. At the same time, during use, halogen-free PCBs do not release harmful substances, ensuring the long-term safety of electronic devices and their environmental friendliness.
Unlike halogen-containing PCBs, halogen-free PCBs do not produce toxic substances such as dioxins and dibenzofurans during combustion, nor do they release large amounts of toxic gases like hydrogen chloride and hydrogen bromide. Halogen-free PCBs mainly produce harmless substances such as carbon dioxide and water vapor during combustion, significantly reducing the harm to personnel and the environment in the event of a fire. This meets the strict requirements of modern society for fire safety and environmental protection and helps reduce the losses and impacts caused by fire accidents.
With the increasing global emphasis on environmental protection, governments and international organizations around the world have introduced a series of strict environmental regulations and standards to limit the use of halogen-containing substances in electronic products. For example, the EU's RoHS Directive (Restriction of Hazardous Substances Directive) clearly stipulates content limits for hazardous substances such as lead, mercury, cadmium, hexavalent chromium, polybrominated biphenyls, and polybrominated diphenyl ethers in electronic and electrical equipment. Halogen-free PCBs comply with these environmental regulations and standards, enabling electronic enterprises to smoothly enter the international market and avoid trade barriers and legal risks due to environmental issues.
For workers engaged in the production, processing, and maintenance of PCBs, the use of halogen-free PCBs can significantly reduce their exposure to toxic and harmful substances during work. The production process of traditional halogen-containing PCBs generates halogen-containing waste gases, wastewater, and waste residues, which pose potential health hazards to workers, such as respiratory diseases and skin allergies. The production process of halogen-free PCBs is more environmentally friendly, reducing workers' occupational exposure risks and safeguarding their health.
When consumers use electronic products containing PCBs, if the PCBs are halogen-containing, they may be exposed to toxic substances released by the halogen-containing PCBs in cases of improper product disposal or fires, thereby posing health hazards. The use of halogen-free PCBs eliminates this potential health threat and provides consumers with a safer and healthier product usage environment.
In conclusion, due to the serious hazards of traditional halogen-containing PCBs, such as the release of toxic substances during combustion and long-term environmental pollution, as well as the environmental advantages and health benefits of halogen-free PCBs, the promotion and use of halogen-free PCBs are an inevitable trend. They are of great significance for protecting the environment, safeguarding human health, and promoting the sustainable development of the electronics industry.
FR4PCB.TECH, Specialized Production: FP4, High TG, halogen-free, aluminum/copper/ceramic-based, and Rogers material printed circuit boards (PCBs).
Offerings: Double-sided boards, multilayer boards, HDI (High-Density Interconnect) boards, rigid-flex boards, high-frequency boards, etc., to cater to diverse requirements.
Surface Finish Processes: OSP (Organic Solderability Preservative), HASL (Hot Air Solder Leveling), ENIG (Electroless Nickel/Immersion Gold), immersion silver, immersion tin, electroplated nickel-gold, and electroless palladium, etc.
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