Vermiculite is a natural mineral that expands with the application of heat. The expansion process is called exfoliation and it is routinely accomplished in purpose-designed commercial furnaces. Vermiculite is formed by weathering or hydrothermal alteration of biotite or phlogopite. 14.5-15.5kg/pe or pp bag, 350bags/20fcl, 720bags/40hq 3-1mm/1-2mm/2-4mm or other sizes customers required.
