It contains minerals such as pyroxene, amphibole, feldspar and 63-68 percent silica. The eruption temperature for dacitic lava is 1,500 to 1,800 degrees Fahrenheit. Dacitic to rhyolitic lava is so dangerous because it contains a high amount of crystals.Mt. Vesuvius erupts according to the Plinian model of eruption.
Foil has low emissivity, so will greatly reduce radiative heat transfer (act like insulation). It should face the side that is supposed to be cooler. But foil will not reduce conductive heat transfer, so it must be used judiciously with something that reduces conduction.
Roof insulation for radiant barrier. Rood insulation is ideal way to prevent unwanted heat penetration from the outside of the building. Roof insulation foil will reduce the amount of sun's radiant heat that penetrate in summer up to 97% and also render better thermal protection in colder situation in winter.