What is Micashield?

Micashield is an aqueous dispersion of exfoliated Vermiculite.

Vermiculite is the name given to a group of hydrated laminar aluminium-iron-magnesium silicates. Raw vermiculite consists of thin, flat flakes containing microscopic layers of water.

When vermiculite is exfoliated thermally, the microscopic layers of water are explosively removed and the flakes expand to worm-like, light weight particles.   Chemical exfoliation also leads to expansion but the result is individual platelets with a high aspect ratio that are freely suspended in water.

In dried, powder form, the high aspect ratio provides a material additive which can offer can offer significant improvements to the fire-resistance of a variety of materials. A non-toxic and easy to use product that is environmentally friendly.

Available in numerous formats, each suitable for the specific application type. Carefully controlled processing techniques ensure that all the range of products exceed the most exacting tests that each fire protection sector demands.

Available to fulfil requirements in Coatings for Industrial textiles, Wet and Dry Fire Retardant additives and Passive Fire Protection situations.

How Does It Work?

Vermiculite is inert and does not react chemically or burn. When the flammable substrate is subjected to heat, the Micashield layer inhibits access of oxygen to the combustible material in a similar manner to a char layer.

This physical barrier acts as a suppressant to smoke and to re-ignition. It reduces the temperature evolution of the substrate. It accumulates at the surface of the substrate and forms a barrier to mass and energy transfer. Micashield reduces the rate of flame spread and heat release.

It can be combined with many different materials where it is encapsulated, or encapsulates, rather than being chemically bound.