After the "11.15" major fire accident in Shanghai, some people were suspicious of the fire safety of polyurethane insulation materials. Recently, the Zhejiang Provincial Fire Corps even issued a statement saying that the use of polyurethane foam materials for exterior wall insulation will be banned throughout the province. For a time, the topic of polyurethane for wall insulation materials has become the focus of social attention. Due to the occurrence of major "11.15" major fire accidents in Shanghai, it is not objective to ban the use of polyurethane foam for exterior wall insulation.。

　　China's flame retardant performance requirements for polyurethane insulation materials used in building energy-saving projects are not lower than B2, and this Shanghai “11·15” major fire was mainly due to poor management, and the project contractor used flammable B3. Grade polyurethane materials, which have serious consequences. According to the "2010-2015 China New Materials Industry Investment Analysis and Forecast Report", the current combustion performance levels of organic insulation materials such as polyurethane are usually divided into three levels, namely B1, B2 and B3. Different grades of polyurethane materials have different combustion properties. Among them, B1 is difficult to burn, B2 is flammable, and B3 is flammable.。

　　Polyurethane material is currently an ideal building energy-saving insulation material, which has been widely used in Europe and North America. At present, most of the construction projects using polyurethane insulation materials in these areas have no problems. Polyurethane insulation materials have become an important part of building insulation materials. In the United States, the use of polyurethane materials to insulate walls and roofs, 97.6% have no problems. The use of thermal insulation materials is one of the main measures to achieve energy-saving in buildings. At present, the market share of polyurethane materials in the construction insulation industry in developed countries such as Europe and the United States has reached more than 50%, while the market share of polyurethane in building insulation materials in China is less than 10%. In the future, relevant state departments should increase supervision over building energy-saving materials to ensure that construction contractors use high-flame-retardant polyurethane energy-saving insulation materials with fire safety performance.。