Halogen-free Flame Retardant Additive for PVC and PP
Industrial grade magnesium hydroxide with 92% whiteness serves as an eco-friendly halogen-free flame retardant widely used in PVC, PP and other polymer systems. Its flame retardant performance originates from comprehensive physical and chemical synergistic effects, and no toxic halogen fumes will be generated during combustion. The detailed flame retardant principles are explained below.
First of all, it provides powerful cooling effect via endothermic thermal decomposition. Magnesium hydroxide starts to decompose at around 340°C. The decomposition reaction absorbs abundant heat from the combustion zone, lowering the temperature of PVC and PP substrates. This slows down thermal degradation of polymer molecular chains and reduces the release of flammable volatile substances, which cuts off fuel sources to sustain combustion.
Secondly, released water vapor plays a dilution role. Large volumes of water vapor produced by decomposition dilute combustible pyrolysis gas and oxygen surrounding flames. The inert water vapor atmosphere restricts continuous oxidation reactions and suppresses flame spreading.
Thirdly, magnesium oxide forms a dense protective barrier. After dehydration, generated magnesium oxide covers the surface of burning polymers. This compact isolation layer blocks external heat penetration into the internal matrix. It also prevents combustible cracking gas from escaping and separates oxygen from contact with base materials, further terminating combustion.
In addition, this material delivers outstanding smoke suppression capacity. The magnesium oxide layer can adsorb soot particles created by incomplete polymer combustion, effectively lowering smoke density. Compared with traditional halogen flame retardants, it achieves low-smoke and non-toxic combustion characteristics.
This 92% whiteness magnesium hydroxide usually receives surface modification treatment to enhance compatibility with PVC and PP. Uniform dispersion inside polymer matrices ensures stable implementation of all flame retardant mechanisms, making it an ideal additive for plastic profiles, pipes, wire and cable materials.
