A natural volcanic glass with a high water content that is heated-expanded to create a lightweight aggregate used in fire-resistant insulation.

volcanic glass used in the production of plasters and insulation.

Lightweight volcanic mineral that is used as a growing medium. persistent:

Lightweight volcanic mineral that is used as a growing medium. persistent:

A natural volcanic glass that when heated turns into fluffy, light-weight granules used as an aggregate or added to potting soil to make it light-weight and compact resistance. Perlite can also be use [..]

A volcanic glass that greatly expands under intense heat. Used in gardening for the loosening of compact soil while still having high water retention qualities.

A mineral used in potting mix to retain moisture and provide aeration.

Perlite is a very light weight, heat-treated volcanic rock that is used to improve drainage and to increase the pore space, for oxygen availability to the roots, in potting soil.

A bright white, naturally-occuring, non-renewable resource commonly added to commercial growing media for aeration and drainage for plants.

Lightweight volcanic material often used in soil less media.

Granular volcanic rock used to lighten potting soil and improve its aeration. pH Content

A volcanic glass that greatly expands under intense heat. Used in gardening for the loosening of compact soil while still having high water retention qualities.

  Starts it journey as volcanic glass with water sealed inside. Then it is heated to 850 to 900 degrees to melt the glass and drive out the water. As the water turns to steam, it produces myrids of ti [..]

Lightweight volcanic material often used in soil less media.

Sand or volcanic glass which has been expanded by heat; perlite holds water and nutrients on its many irregular surfaces. pH:

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 co [..]

An inert growing medium for hydroponic cultivation made from heat-expanded volcanic glass or sand. Perlite is often used in combination with other media to provide better aeration.

A soilless medium that is fired volcanic pumice.

1. Sand or volcanic glass which has been expanded by heat; perlite holds water and nutrients on its many irregular surfaces.

 Lightweight volcanic mineral that is used as a growing medium.

Expanded volcanic rock in granules used as an additive to soils and composts to improve the texture, retain water and let in air. It is very lightweight and therefore easier to handle — both on its own, and in combination with peat or peat substitutes for soil-less composts — than sand.

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 formed by heating and expanding siliceous volcanic glass.

An insulating material that can be mixed with Portland cement to make Insulating Concrete, or pour loose around the Oven Dome. Similar to vermiculite, these materials are less efficient than ceramic i [..]

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 micropar [..]

a broad term for naturally occurring silica-rich rock. Perlite is different from other volcanic glasses as when heated to a suitable point it increases from four to twenty times its original size.  Th [..]

A lightweight volcanic glass used to increase aeration in potting mixtures.

An amorphous volcanic glass that has a relatively high water content, typically formed by the hydration of obsidian. It occurs naturally and has the unusual property of greatly expanding when heated sufficiently. It is an industrial mineral and a commercial product useful for its light weight after processing.

A soilless medium that is fired volcanic pumice.