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IMERYS is a supplier of high quality pozzolanic minerals and perlite to the building and construction industry throughout the world.


Metakaolin is manufactured by the calcination of kaolin to form an amorphous pozzolanic white mineral additive for use in cement based products.


The pozzolanic reactivity of Metakaolin is its ability to react with calcium hydroxide in cement based products.

Imerys offer three types of Metakaolin:


ARGICAL M 1000, produced in a rotary kiln (cement type kiln) yields a powder after grinding of about d50 10-15 µm.


ARGICAL M 1200S, powder calcination in a flash calciner to obtain a hyper-reactive product [mineral reagent] of about d50 between 1 and 2µm.


MetaStar™ 501 a high quality concrete additive. Metastar™ is a Metakaolin, with controlled and consistent pozzolanic activity that can be used to enhance the performance of concrete products.


Metakaolin in Concrete

Metakaolin reduces the porosity of concrete, a feature that can allow a reduction in the “cover” of concrete needed to protect reinforcing bars from corrosion. Road and marine structures exposed to corrosive salts are good examples where Imerys Metakaolin can be used to advantage.

Where high strength concrete is required, Imerys Metakaolins increase cured compressive strength of concrete and also speed up curing and early strength development. This makes Imerys Metakaolins suitable for use in applications where high strength is required quickly, such as airport aprons.


Efflorescence is a common problem affecting concrete, caused by lime salts forming calcium carbonate on the surface of the concrete. Imerys Metakaolins can reduce efflorescence by reducing the porosity of the concrete and reacting with the lime salts before they reach the concrete surface.

Metakaolin can also be used to modify the handling properties of wet concrete, particularly benefiting the viscosity profile and reducing the tendency to bleed, making leveling and achieving a good suarface finish easier.


Metakaolin in Glass Fiber Reinforced Concrete (GFRC)

GFRC is a combination of mineral components and glass fibre, obtained by a projection method.

Glass fibre strengthens concrete properties and gives GFRC cohesion, flexural resistance and ductility.


Normally with time, lime formation within the cement, leads to weaker connections between the cement matrix and the fibres which cannot slip anymore. The material is not able to absorb the energy and finally leads to a fatal brittle breakdown of the pieces (loss of ductility).

Combining lime with Metakaolin gives calcium silicate hydrates (CSH), which improve the mechanical performance and the durability of concrete and, by consuming lime, prevent it spoiling glass fibre.


Plasters and Mortars

In Plasters and Mortars, Imerys muscovite Mica MU grades can improve mixing and trowelling properties and improve the flexibility of the finished product.


All of our products are supported by a high standard of technical service, product development and research from a team of highly experienced scientists and specialists in the building & construction industries.


Imerys Perlite for Construction Applications

Because of perlite's outstanding insulating characteristics and light weight, it is widely used as loose-fill insulation in masonry construction. In this application, free-flowing perlite is poured into the cavities of concrete block where it completely fills all crevices. In addition to providing thermal insulation, perlite enhances fire ratings, reduces noise transmission and it is rot, vermin and termite resistant.


When perlite is used as an aggregate in concrete, a lightweight, fire resistant, insulating concrete is produced that is ideal for roof terraces and other applications. Perlite can also be used as an aggregate in Portland cement and gypsum plasters for exterior applications and for the fire protection of beams and columns. Other construction applications include under-floor insulation, chimney linings, paint texturing, gypsum boards, ceiling tiles, and roof insulation boards.


Recommended products are:

BulletEuroperl® B6

BulletEuroperl® B10

BulletEuroperl® B12

BulletEuroperl® A13

BulletHarborlite H30X20S


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Argical M 1000 & Argical M 1200S are AGS products, part of the Imerys Group. For more information please visit




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©Imerys Minerals Ltd. 2012 | Registered office: Par Moor Centre - Par Moor Road - Par - Cornwall - PL24 2SQ UK | Company No: 269255