Micronized magnesium aluminium silicate (MMAS), also known as magnesium aluminium silicate (MAS), is a type of clay mineral that is commonly used in various polymer applications. Here are some potential uses of micronized magnesium aluminium silicate in polymers:


MMAS can act as a reinforcing filler in polymer composites, enhancing their mechanical properties such as strength, stiffness, and dimensional stability. It helps to improve the tensile strength and modulus of elasticity of polymer matrices, making them suitable for applications requiring high mechanical performance.

Rheology Modification

MMAS can be used to modify the rheological properties of polymer formulations. It acts as a thickening agent or rheology modifier, controlling the flow behaviour and viscosity of the polymer matrix during processing and application. This is particularly useful in applications where controlled flow and viscosity are required, such as in adhesives, coatings, and sealants.

Barrier Properties

MMAS can enhance the barrier properties of polymers, particularly in applications where gas permeability or moisture resistance is important. It forms a barrier network within the polymer matrix, reducing the diffusion of gases or liquids through the material. This property is beneficial in packaging materials, where it helps to extend the shelf life of perishable products by preventing moisture ingress or gas exchange.

Opacifying Agent

MMAS can be used as an opacifying agent in polymer coatings and films to impart opacity and whiteness. It helps to scatter and diffuse light, resulting in a more opaque and visually appealing appearance. This property is desirable in applications where opacity or hiding power is important, such as in coatings for paper, textiles, and plastics.

Flame Retardancy

While not as effective as dedicated flame retardants, MMAS may contribute to improving the flame retardancy of polymers to some extent. It can help reduce the flammability of polymer composites by forming a protective char layer when exposed to heat.