Vermiculite faq


What is vermiculite?

Vermiculite is a naturally occurring silver-gold to gray-brown mineral that is mined throughout the world. When heated, the vermiculite ore expands into a light, fluffy material, that is fire resistant, chemically inert, absorbent, light weight and odorless. The absorbent properties of the expanded vermiculite make it useful in lawn and garden, agricultural, and horticultural products. It is commonly used as an ingredient in potting soil, thermal and sound insulation, construction material, insulation material and for lightweight, absorbent packaging material.

How is Vermiculite formed?

It is derived from rocks containing large crystals of the minerals biotite and iron-bearing phlogopite. As these rocks are exposed to the weather, they start to decompose, allowing water to enter and react with the various chemicals present. As the decomposition and chemical reactions proceed, vermiculite is formed.

A typical chemical analysis of commercial vermiculite shows it contains 38-46% silicon oxide (SiO2), 16-35% magnesium oxide (MgO), 10-16% aluminum oxide (Al2O3), 8-16% water, plus lesser amounts of several other chemicals.

What is the Manufacturing Process of Vermiculite?

The typical manufacturing process used to produce commercial expanded vermiculite is, Mining, Concentrating, Grading, Exfoliating, Classifying

Where is vermiculite used?

Vermiculite has been used in various industries for more than 80 years. It is used in the construction, agricultural, horticultural, industrial markets and others.

Is horticultural vermiculite safe?

Based on current information, there is no evidence that vermiculite currently available for horticultural purposes (e.g. potting plants) is a health risk if used as directed.

Does Vermiculite Contain Asbestos?

No. The Vermiculite that we use in our product and the Micalite Boards is checked by an independent laboratory for the presence of Asbestos. Asbestos has never been detected in our product. Vermiculite is sometimes associated with Asbestos because of an incident that took place in Montana, USA. This particular mine has been closed now for many years and we has never used vermiculite from this source.



Vermiculite for plasters
Vermiculite Plasters

Vermiculite plasters can be made with either gypsum or Portland cement...

Bitumen Coated Vermiculite Screeds
Bitumen Coated Vermiculite Screeds

Vermiculite, coated with a bituminous binder, can be...