The structure of this insulation material is aluminium foil / XPE foam / aluminium foil or aluminium foil / EPE foam / aluminium foil . The aluminium foil plays the role of reflecting radiation heat from sunshine with reflectivity of ****7%.  And the XPE foam has the function of trapping air so as to stop convection heat. Most importantly, in response to customer's flame retardance requirement, our XPE foam can be made fireproof so that this product will not easily catch fire and will not encourage fire when fire hazard happens. Our product has passed AWTA's test in thermal conductivity and fireproof performance.