VERMICULITE: MINERAL AND EXFOLIATION PROCESS

2026-01-09

Vermiculite is a natural mineral from the group of micas. Formed mainly by silicates of iron and magnesium, its manufacture goes through the extraction of raw material in mines. The extraction is done in open-pit mines.

The extracted vermiculite is processed by separating rocks and other impurities. In this way only the mineral remains, which is classified according to sizes.

Subsequently a heat treatment, known as exfoliation, is performed to expand the mineral. Vermiculite has a great capacity to exfoliate when heated.

When heated, vermiculite expands (exfoliates) to up to 12 times its original volume. The exfoliation process converts the dense flakes of ore into lightweight porous granules containing innumerable air layers.

The exfoliated vermiculite is light and clean, has a high thermal and acoustic insulation value, is incombustible and insoluble in water and has the ability to absorb liquids. That makes it as a natural insulation for the industry and the agriculture.

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