Where is the wholesale market for second-hand insulation boards?

Xisanzhuang Building Materials Market. According to the Baidu map, the insulation board wholesale market is in Xisanzhuang Building Materials Market, located at the intersection of Shijiazhuang North Second Ring Road and Xisanzhuang Street. In simple terms, insulation boards are boards used to insulate buildings. Insulation board is a rigid foam board made of polystyrene resin as raw material plus other raw materials and polymers, heated and mixed while injecting a catalyst, and then extruded and molded.