Polyurethane industry off "LOI" dispute

" Building materials and combustion products classification " (GB8624-2012) standard was started in October last year . Which provides that , if the oxygen index of the polyurethane material is less than 30, it can not be considered as material class B1 . Polyurethane industrial industry believes that this indicator set is not science.Masking tape

China Polyurethane Industry Association Deputy Secretary-General Li Jianbo think , regardless of the specific materials used in the same targets " one size fits all " requirements "unreasonable " because different materials to achieve the same level B1 , the oxygen index is not consistent. With EPS (expanded polystyrene board ), XPS ( extruded plate ) , for example, these materials reached B1 level , the oxygen index can easily exceed 32 , but it is difficult to reach 30 polyurethane , unless you change the production process , but the change process after that, although the oxygen index of the standard , but other physical and chemical properties , such as heat resistance, robustness will be discounted , but the cost will rise significantly.Wholesale masking tape


Li Jianbo introduced , compared to EPS, XPS and other materials, polyurethane low oxygen index does not mean low fire performance. " Belong thermoset polyurethane foam insulation, fire burning , the carbon layer formed on its surface , carbide layer can prevent the spread of flame , while EPS and XPS are thermoplastic materials , when a fire will melt, drip, drip of these same can burn . "

Standard editor of Sichuan Fire Research Institute Ministry of Public Security Fire unit building Chenggang , director , said the draft standard submitted for review at the Ministry of Public Security Fire Department , B1 grade oxygen index value is greater than or equal to 28 , after the Ministry of Public Security Fire Department finalized the B1 level oxygen index greater than or equal standard 30.Washi tape