Mandoval is the leader in the supply of raw and ex-foliated vermiculite in South Africa for over 75 years. Vermiculite is a member of the Phyllosilicate group of minerals, resembling mica in appearance. It is very versatile and has a wide range of uses from animal feed to fire protection to acoustic insulation.
Mandoval is the leader in the supply of raw and ex-foliated vermiculite in South Africa for over 75 years. Vermiculite is a member of the Phyllosilicate group of minerals, resembling mica in appearance. It is very versatile and has a wide range of uses from animal feed to fire protection to acoustic insulation.
Mandoval’s Vermiculite is non-toxic, asbestos free and environmentally safe.
Mandoval Vermiculite has an extensive range of Fire Proofing products used in building design.
Mandoval Vermiculite has a range of decorative and acoustic products.
Mandoval’s Vermiculite is non-toxic, asbestos free and environmentally safe.
Technically Vermiculite encompasses a large group of Hydrated Laminar Magnesium-Aluminum Iron Silicates which resemble Mica.
There are two key properties of Vermiculite. The first is its laminar (or layered) crystalline structure which provides the hinged plates that make the material expand or unfold in a linear manner like an accordion. The second is that it contains trapped water which flashes into steam when heated to force the layers open.
There are many naturally occurring Vermiculite minerals and soils and their identification often requires sophisticated scientific analysis. One of the most common forms of Vermiculite is generally known as Commercial Vermiculite. 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 reaction proceed Vermiculite is formed.
The exfoliation of Vermiculite is critical to ensuring the maximum attributes of the products are obtained. Poor exfoliation reduces the absorption properties being water or chemicals. It also affects the material density.
Mandoval’s products are exfoliated using a system of maximum heat and controlled feed of the raw material thus ensuring our products are supplied according to stringent quality standards.
Exfoliation occurs at the right angles of the cleavage planes, causing the flakes to expand into concertina shaped granules. Commercial exfoliation of vermiculite is achieved by passing the crude vermiculite in a controlled manner through a furnace chamber at elevated temperatures. Vermiculite reabsorbs some moisture after exfoliation.
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