... weight,heat and sound insulation,anti-corrosion and bending,easy to install,low cost Sandwich Panel uses ... colour coating steel sheet as surface board, it uses self-extinguishing polystyrene, Polyurethane, crystal cotton and ... for original building, temporary office, store, market and sentry box. Technical parameter:1. Board thickness: ... º C5. Oxygen index: ≥ 26 wall and roof Sandwich panel