Hard polyurethane sandwich board combustion performance?
In general, the ordinary hard polyurethane sandwich board combustion performance is very good, it depends on how you treat this problem. Requirements are high or low are the main reasons for quality
Some in the processing process plus a flame retardant ,,, and some did not add
Plus the general is 3 to 5 seconds from the fire self-extinguishing
According to the industry standard JCT 868-2000 metal surface rigid polyurethane sandwich panels, sandwich panels combustion performance should reach B1 level. Classification of combustion performance grade in accordance with national standards GB 8624-1997.
