Shanghai Risheng Technology Co., Ltd.
Flame retardants should not talk about "bromine" color change
In recent years, the relevant environmental regulations have made more and more strict restrictions on the use of flame retardants in terms of safety and environmental protection, which has led to the misunderstanding of some flame retardants, which has attracted the attention of the industry.
The EU's RoHS directive restricts the application of two brominated flame retardants, polybrominated biphenyls and polybrominated diphenyl ethers, in electronic appliances. China's RoHS-"Administrative Measures for Pollution Control of Electronic Information Products" also restricts polybrominated biphenyls and polybrominated diphenyl ethers, rather than the entire brominated flame retardants or halogen-containing flame retardants. Therefore, it is necessary to introduce several facts about halogen-containing flame retardants, especially brominated flame retardants.
Fact 1: The vast majority of brominated flame retardants have been rigorously evaluated and proven to be harmless to humans and the environment.
Brominated flame retardants include more than 70 varieties. Independent research and risk assessment of chemicals are based on a single chemical substance rather than a class of chemical substances. It is unscientific to conclude that a large class of substances are toxic.
The vast majority of brominated flame retardants do not carry toxic labels, and many brominated flame retardants have even lower acute toxicity than table salt, such as tetrabromobisphenol A, the most used brominated flame retardant.
The European Food Safety Authority's (EFSA) Contaminants in the Food Chain Panel has conducted extensive assessments of the potential presence of brominated flame retardants in food over the past two years. They concluded that most of the brominated flame retardants evaluated did not pose a health risk and their presence in food was unlikely to be a cause for concern. This includes polybrominated biphenyls, polybrominated diphenyl ethers, hexabromocyclododecane and tetrabromobisphenol A.
Fact 2: The normal use and recovery of brominated flame retardants have not increased the emission of toxic and harmful gases in the air.
Only individual structural brominated flame retardants can form dioxins when burned under certain conditions (such as incomplete combustion). The European large-scale plastic waste incineration test proves that the various dioxins and furans produced by co-combustion are not directly related to the bromine content of the garbage.
Any material combustion will release a variety of toxic and harmful gases such as carbon monoxide. The National Bureau of Standards (NIST) tested a series of products with and without flame retardants: flame retardant products released 1/3 less total toxic gas than non-flame retardant products; carbon monoxide emissions are about half; and smoke generation is about the same.
Fact 3: Plastics containing brominated flame retardants are more recyclable than other flame retardant systems.
The EU's risk assessment report shows that electrical and electronic equipment containing flame retardants can be disposed of in an environmentally friendly way and can meet the requirements of the Waste Electrical and Electronic Equipment Directive (WEEE) and the EU's strict emission regulations. Compared with other flame retardants, brominated flame retardants show superior recyclability and stability.
Fact 4: The development of new brominated flame retardants has never stopped.
New polymeric (macromolecular) brominated flame retardants have been successfully developed to replace hexabromocyclododecane, which is more environmentally friendly because the molecules are too large to penetrate biological cell membranes to participate in systemic circulation and metabolism, and thus do not harm organic organisms.
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