Volcanic rock commonly known as pumice or porous basalt, also known as pumice rock, it is a dense porosity of molten magma condensed by volcanic eruption glassy lava, the porosity volume accounted for more than 50% of the volume of the rock.

Perlite is a commonly used building insulation material in the construction industry and is often used in external wall insulation. Perlite has strong water absorption and is easy to seep water and gain weight, and the outer layer needs to be a waterproof coating when it is usually used for external wall insulation.

Volcanic stone (volcanic rock or pumice) is a kind of glassy lava with dense pores formed by the rapid expansion of internal gas due to the sharp reduction of pressure after the sudden cooling of magma during the volcanic eruption. The pore volume accounts for more than 50% of the rock volume. It is called pumice because of its many pores, light weight and ability to float on the surface of the water. It is characterized by high strength, heat preservation, heat insulation, sound absorption, fire protection, acid and alkali resistance, corrosion resistance, and no pollution, no radioactivity.

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Calcium fluoride is an inorganic compound that is colorless crystal or white powder. Insoluble in water, slightly soluble in inorganic acid, react with hot concentrated sulfuric acid to produce hydrofluoric acid. In general, calcium fluoride is prepared by the interaction of calcium carbonate with hydrofluoric acid or by repeated treatment of fluorite powder with concentrated hydrochloric acid or hydrofluoric acid.

Mica is a rock-forming mineral with a hexagonal lamellar crystal shape. Characteristics are insulation, high temperature resistance, the most used in industry is sericite, widely used in paint, paint, electrical insulation and other industries.

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The density characteristics of volcanic rocks depend on their composition and formation process.

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