wall&roof sandwich panels:light weight,heat and sound insulation,anti-corrosion and bending,easy to install, ... is used to purify factory roof, protect and purify product industrial factory, storehouse, refrigeratory; Large ... layer for original building, temporary office, store, market and sentry box. Technical parameter:1. Board thickness: ... C---80º C5. Oxygen index: ≥ 26 wall and roof Sandwich panel