... :2008 4.100mm, 150mm PU sandwich panel and cold storage PU sandwich panel is using colour coating steel sheet as surface finishing and polyurethane (PU) as core material ... sides:Carbon steel sheet, color steel sheet, stainless steel sheet for customers' option 2) Thickness(mm): 0.4, 0.42, 0 ... , 100, 120, 150, 200mm.3.Fireproof:According to customer requirement. PU sandwich panel for cold storage