Once burned, it emits halide gases that quickly absorb oxygen and extinguish the fire.The earliest printed circuit board materials used for this purpose added halogens to the PCB material.but halogen flame retardants added to the polymers cannot be recycled and will release harmful substances during combustion and heating. The addition of halogen in polymer products such as plastics can improve their ignition point, which is higher than that of ordinary polymer materials, and the ignition point can reach 300℃. Halogen compounds are often used as flame retardants because of their high ignition points. And what we use on PCB, chlorine, and bromine are in the majority. Due to Astatine is a radioactive element, the halogens commonly referred to are fluorine, chlorine, bromine and iodine. Most importantly, there will be a small amount of smog when burning, and without toxic gas produced.Halogen is the ⅦA family of nonmetal elements, including fluorine, chlorine, bromine, iodine, and astatine five elements called the Halogen. Halogen-free FRs boast many advantages, not easy to be precipitated from the resin material after special treatment to its surface and have good flame retardant effect. Halogen used as a raw material will bring great side effect, so it’s necessary to ban it.īy contrast, halogen-free flame retardant is a type of high-performance organic FR containing phosphorus and nitrogen, mainly including triazine triketone and triazine triamine compounds. On Dec.5,2019, the European Union issued a regulation that halogenated FR are banned from being used in the casing and support of the electronic display. If inhaled in, they cannot be discharged from the living body, seriously detrimental to health. These gases are classified as carcinogenic substances by the World Health Organization. However, studies have shown that materials made with halogenated FR, when heated and burnt, will release large amounts of highly toxic smog and gases which are comprised of dioxins (a very poisonous chemical used in industry and farming), benzofuran, etc. They have low price, good stability and excellent compatibility with synthetic resin materials. Halogenated FR is a halogen-containing polymer or a halogen-containing FR combination, the main ones being antimony trioxide (Sb2O3) and decabromodiphenyl oxide (abbreviated to DBDPO), i.e. The latter, reactive FR, participates in polymerization reactions as a monomer so that the polymer itself contains FR components.ĭifference Between Halogenated FR and Halogen-free FR Such type of FR generally includes organic FR and inorganic FR, halogenated FR and halogen-free FR. The former can be directly mixed with polymers to give them properties of slowing down combustion. According to usage, FR can be divided into the additive FR and the reactive FR. It’s developed initially for flame retardation of polymer materials. The flame retardant (hereinafter abbreviated to FR), as a functional agent, makes it difficult for the combustible polymers to burn. Halogen-free FR-4 can simply be regarded as an improved non-halogen product reinforced with the properties of flame retardance.ĭefinition and Type of the Flame Retardant “4” represents a category of reinforced sheet materials, i.e., the fiberglass substrata. They exist in nature as typical of salts. The halogen elements on the periodic table of chemical elements include fluorine (F), chlorine (CL), bromine (Br), iodine (I) and astatine (At).
It is an environmentally friendly epoxy fiberglass laminate with halogen-free flame retardant added.
But today, what I want to explain is halogen-free FR-4, one of our featured products.
When it comes to “halogen”, people’s first reaction is the sweet-smelling flavoring bag used for braised meat.