What is perlite?
Perlite
is a volcanic mineral that is mainly formed by silicate extracted by
Perfiltra from its beds in the Province of Salta.
A
major property of perlite is that its
original volume expands up to twenty times when heated to its
softening point.
The expansion process is caused by the presence of water inside the
raw mineral. When heated to approximately 900 °C, the internal water
is turned to steam and forces the expansion of the softened mineral.
In this way, many small, pearlike spheroids are formed, which are
responsible for the major properties of expanded perlite.
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