Perlite is a white gravelly, yet extremely light material It is the same material found in garden centers and used as part of potting mixtures Perlite is no longer used as an insulating material, except for the occasional do-it-yourselfer, although it is not uncommon to find it in existing houses
an aggregate used in lightweight insulating concrete and in preformed perlitic insulation boards, formed by heating and expanding siliceous volcanic glass
potting medium that resembles little balls of styrofoam; allows for good drainage
or pearlstone Natural glass with concentric cracks such that the rock breaks into small, pearl-like bodies. It is formed by the rapid cooling of viscous lava or magma. Perlite is porous and has a waxy to pearly lustre and is commonly gray or greenish but may be brown, blue, or red. Since 1950, large deposits have been worked in New Mexico, Nevada, California, and other western states. Heat-treated perlite is a substitute for sand in lightweight wall plaster and concrete aggregate. Perlite is used for heat and sound insulation, lightweight ceramic products, and filters
A naturally occurring volcanic glass, that thermally expands upon processing Perlite is chemically a sodium potassium aluminum silicate After milling, a three-dimensional multihedral structure is present, but because its structure is not as intricate (or tortuous) as that of diatomite, perlite is better suited to the separation of coarse microparticulates from liquids having high solids loading Perlite and diatomite are common functional filtration components of depth filter sheets and pads
Light granules of volcanic minerals added to soil or to potting and seed composts to improve aeration
A substance used to provide ventilation and moisture retention in a potting soil or other growing medium It ia a form of volcanic rock heat treated to create coarse lightweight granules
Perlite is the lamellar aggregate of ferrite and iron carbide resulting from the direct transformation of austenite at the lower critical point
A highly siliceous volcanic rock which can be expended by heating into a porous mass of particles Perlite can be used as an insulation in foundry sand mixtures Not to be confused with Pearlite
an aggregate used in lightweight insulating concrete and in performed perlitic insulation boards, formed by heating and expanding siliceous volcanic glass
is light granules of volcanic minerals added to soil or potting and seed starting mixes to improve aeration
Volcanic ash that has been exposed to very high heat expands to form perlite It is very light weight and is often used in potting mixes to encourage good drainage, as well as to keep the soil from compacting Because it is also porous, it helps to maintain soil moisture Its size ranges, but it is about as large as gravel See also vermiculite
Expanded volcanic glass, very light in weight and useful as insulation although it has a lower R-value than some materials Can be added to plaster and is fire resistant
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