How to evaluate the combustion performance of materials by oxygen index value of materials

The abbreviation of oxygen index is OI. The smaller the oxygen index of plastics, the lower the oxygen concentration required for continuous combustion, and the more flammable the materials are. On the contrary, the greater the oxygen index of plastics, the higher the oxygen concentration required for continuous combustion, and the more difficult the materials are. It is generally believed that; When OI 27, plastics are difficult to burn. The OI of most plastics is less than 27, and the OI of plastics in flame retardant occasions is required to be around 30.