... m3,export over 30 countrie PU sandwich panel for cold room focus on researching and manufacturing of various polyurethane ... PU cold storage panel by continous line,PU wall panel,PU roof panel,PU cam lock panel.Thickness of cold room panel ... line:No1,the continous line,it can make PU cold storage pane,its tandard width 985mm,length can do ... : less than 5 PU sandwich panel for cold room,freezer