Grey Color Natural Raw Volcanic Rocks Perlite Application: Metal Finishing

These perlites are volcanic rocks that have been heated to very high temperatures. It comes in a granular shape used as a soil amendment and in horticulture. The grey-colored perlite is reversible, so you can use it accordingly. That mineral is commonly utilized for metal finishing and special casting sand. It has a 2.2-2.4 g/c3 gravity, so you can use it as insulation, filtration, and as a heat-resistant additive in cement, plaster, and paint.