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About Perlit:
Perlite is not a trade name but a generic term for naturally
occurring siliceous rock. The distinguishing feature which
sets perlite apart from other volcanic glasses is that when
heated to a suitable point in its softening range, it
expands from twenty times its original volume. This
expansion process also creates one of perlite's most
distinguishing characteristics: its white color.(Perlite,
meaning pearl stone, is a glassy volcanic rock with a gray
to black color. This type is called as raw perlite.)
Uses For Perlite
There are many uses for perlite. These uses can be broken
down into three general categories: construction
applications, horticultural applications, and industrial
applications.
Construction Applications
Because of perlite's outstanding insulating characteristics
and light weight, it is widely used as a loose-fill
insulation in masonry construction. In this application,
free-flowing perlite loose-fill masonry insulation is poured
into the cavities of concrete block where it completely
fills all cores, crevices, mortar areas and ear holes. In
addition to providing thermal insulation, perlite enhances
fire ratings, reduces noise transmission and it is rot,
vermin and termite resistant. Perlite is also ideal for
insulating low temperature and cryogenic vessels. When
perlite is used as an aggregate in concrete, a lightweight,
fire resistant, insulating concrete is produced that is
ideal for roof decks and other applications. Perlite can
also be used as an aggregate in Portland cement and gypsum
plasters for exterior applications and for the fire
protection of beams and columns. Other construction
applications include under-floor insulation, chimney linings,
paint texturing, gypsum boards, ceiling tiles, and roof
insulation boards.
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