During EPS panel manufacturing, 100 grams per square meter of two compounds of Polyurethane Glue (Polyol and Isocyanate) are dripped on each inner side of the steel skin to ensure bonding strength between the steel skin and the EPS core. The glue is mechanically swiped and mixed before the panels go through a heated laminated press process. A glue test is conducted on the first 2 meters of produced panel and every 100 meters of panel after that.