What are the common flame retardants

1. Chlorine flame retardant








Recently, brominated flame retardants have been replaced by chlorinated flame retardants, and the consumption of chlorinated flame retardants has decreased.








2. Brominated flame retardant








3. Phosphorus flame retardant








Phosphorus flame retardants include inorganic phosphorus flame retardants and organic phosphorus flame retardants.








4. Nitrogen flame retardant








Melamine and melamine cyanurate (MCA) are commonly used. Synergists are often added to PA, PU, Po, pet, PS, PVC and other resins. Nitrogen / phosphorus is the most commonly used synergistic flame retardant system.








5. Intumescent flame retardant








6. Inorganic hydroxide flame retardant








Flame retardants are functional additives that give flammable polymers flame retardancy. They are mainly designed for the flame retardancy of polymer materials. There are many types of flame retardants, which can be divided into additive flame retardants and reactive flame retardants according to the method of use.








Additive flame retardants are added to polymer by mechanical mixing method to make the polymer have flame retardancy. At present, additive flame retardants mainly include organic flame retardants and inorganic flame retardants, halogen flame retardants (organic chlorides and organic bromides) and non halogen flame retardants. Organic flame retardants are represented by bromine, phosphorus nitrogen, nitrogen, red phosphorus and compounds, while inorganic flame retardants are mainly antimony trioxide, magnesium hydroxide, aluminum hydroxide, silicon and other flame retardants.








Reactive flame retardant is used as a monomer to participate in the polymerization reaction, so that the polymer itself contains flame retardant components. Its advantage is that it has less impact on the performance of polymer materials and has long-lasting flame retardancy.