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.
In contrast to fiberglass insulation, cellulose insulation does not trap air in between it's fibers to control heat. By nature, the cells inside the cellulose insulation have their own insulating power. Which means cellulose insulation can be compressed into a space and offer additional r-value. Cellulose insulation is actually shredded paper with a fire retardant chemical known a borate. During the manufacturing process, this paper is broken down into its most basic element, cellular fibers from a tree.