Lightweight volcanic material often used in soil less media.
Light granules of volcanic minerals added to soil or to potting and seed composts to improve aeration.
Small granules of white expanded volcanic mineral mixed with seed compost to improve air supply.
Volcanic glass superheated to form a lightweight aggregate which can be used in 'tufa. Has a high moisture content.
an obsidian , or other vitreous rock with a concentric structure and which is expansible by heating
lightweight, porous, white granules that can hold water and air.
A glossy volcanic rock which expands when heated. Processed perlite is used as loose fill insulation material or bound into slabs.
A man-made soil amendment used to improve drainage in potting mixes.
a soilless medium that is fired volcanic pumice
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.
1. Sand or volcanic glass, expanded by heat, holds water and nutrients on its many irregular surfaces 2. Mineral soil amendment
A mineral expanded by heating to form very lightweight, porous white granules useful in container soil mixes to enhance moisture and air retention.
an expanded mineral forming white, lightweight, moisture retentive but also porous granules used in soil mixtures (compare to vermiculite).
White, lightweight, inert material derived from volcanic rock and used to improve drainage in potting composts.
is mined volcanic glass heated to extreme temperatures and used as a grow medium. Perlite is often combined with vermiculite.
Small globules of heat expanded volcanic rock used to increase the porosity and drainage of potting mixes. Often used in the rooting of cuttings as it is both inert and sterile.
is light granules of volcanic minerals added to soil or potting and seed starting mixes to improve aeration.
A volcanic glass which expands on heating and forms a useful insulating aggregate.
An insulating material that can be mixed with Portland cement to make Insulating Concrete, or pour loose around the Oven Dome.
an aggregate used in lightweight insulating concrete
Heat-expanded volcanic glass used to lighten potting mediums and create space for air particles.
A natural volcanic glass having distinctive concentric cracks and a relatively high water content.. Perlite in a fluffy heat expanded form is used in lightweight insulating concrete, fire-resistant rigid insulation board (R = 2.78 per inch) and potting soil.
A volcanic mineral heated to make it expand. This reduces its density and helps increase porosity when added to potting soil.
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.
A mineral, which when expanded by a heating process forms light granuals. Perlite is a good addition to container potting mixes, to promote moisture retention while allowing good drainage.
Mineral used in potting mix to retain moisture and provide aeration.
A potting media. Expanded volcanic rock.
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.
Sand or volcanic glass which has been expanded by heat; perlite holds water and nutrients on its many irregular surfaces.
A lightweight aggregate made from a volcanic glass that has been expanded by heat to form white, very lightweight kernels useful in opening cavities in soil to allow water and air to reach the roots; often used in potting soil.
An aggregate formed by heating and expanding siliceous volcanic glass.
A volcanic glass metallic alloy that is composed of a carbide of iron, cementite (Fe3C), and a ferric oxide compound, fernite (e.g., NaFeO2), that are combined in proportions that yield the lowest melting point of this metal combination.
a form of hydrated obsidian or other vitreous rock broken up by minute spherical cracks. [AHDOS
Perlite is a very light mineral, often found next to the Vermiculite in gardening stores. It has millions of microscopic pores, which when it gets damp, allow it to 'breathe' lots of water into the air, making it humid. Mushrooms like humidity when they're Fruiting.
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.
A type of insulation made from obsidian or other vitreous rock that looks like glass pellets. It is poured into the cavities that need to be insulated.
an aggregate used in lightweight insulation concrete and in preformed perlitic insulation board, formed by heating and expanding siliceous volcanic.