What is mica used for?
Mica is a naturally occurring mineral group known for its shiny appearance, flaky structure, and excellent thermal and electrical insulating properties. At LKAB Minerals, we supply high-quality and responsibly sourced Mica tailored to meet the demands of various industries, from construction and coatings to plastics and ceramics. But exactly what is mica used for, and why is it such a valuable material across so many sectors? Let’s explore.
Construction and building materials
One of the most common uses of Mica is in construction products, particularly in joint compounds, plasters, and wall coatings. Its layered structure improves workability, provides excellent crack resistance, and enhances adhesion. In joint compounds, it can improve smoothness, reduce shrinkage and prevent cracking in drywall finishing. In spray plasters and renders, it offers a consistent texture and helps prevent sagging on vertical surfaces.
Paints and coatings
In decorative and industrial paints, Mica is prized for its sheen, durability, and weather resistance. Its reflective quality gives paints a pearlescent finish, while also acting as a barrier against UV light and moisture. In exterior coatings, Mica provides long-lasting protection and aesthetic appeal, while in anti-corrosion paints, it adds a barrier of protection by layering within the coating film.
Plastics and polymers
Mica enhances the mechanical strength, dimensional stability, and heat resistance of plastic products. It is often used in thermoplastics for automotive and electronic components. In vehicle parts, it helps reduce weight while maintain rigidity and temperature resistance. In electrical housings it is able to ensure thermal insulation and improve fire resistance.
Rubber and sealing materials
In rubber compounds, Mica contributes to improved flexibility and gas barrier properties. It is commonly found in gaskets, seals, and hoses, where both durability and performance under pressure are key.
Ceramics and refractories
Mica is added to ceramic formulations to enhance thermal shock resistance and reduce cracking. Its presence in kiln furniture and electrical insulators ensures stability in high-temperature environments.
LKAB Minerals MicaFort
MicaFort, supplied by LKAB Minerals, is a mica mineral known for its stability and insulating properties, making it valuable across industries such as construction, plastics, and coatings. It improves plastics and polymers performance by providing flexibility, thermal stability, and resistance to corrosion.
MicaFort is increasingly used in thermoplastics as a high-performance alternative to fibreglass. It effectively reduces warping, enhances surface finish, and improves mechanical and dimensional stability. In polypropylene, it offers a superior modulus, lower thermal expansion (CLTE), higher heat-rejection temperature, and potential density reduction. MicaFort also benefits polymers like PE, TPO, PBT, and duroplastics, boosting strength, durability, and mould release efficiency in elastomers.
MicaFort, offered by LKAB Minerals, also improves industrial coatings by enhancing durability, reducing cracking, and forming a protective barrier against chemicals and moisture. It boosts performance in epoxy, water-based, and fire-resistant coatings, offering benefits like UV resistance, lower flammability, and stronger paint layers. It also improves surface finish and recyclability in foundry coatings, with additional uses in rubber tire and heat-resistant paints.
Lastly, MicaFort is ideal for seed coatings thanks to its low moisture content, which helps prevent seed rot and premature germination. Its potassium content supports early plant growth, while its flowability improves seed distribution during planting. Phlogopite offers a natural bronze colour, and Muscovite provides a high sheen and accepts pigments well, making it perfect for colour-coded seed identification.
Want to learn more?
If you are looking for a reliable Mica supplier or need technical advice for your formulation, get in touch with our experts today. We are here to help you find the best mineral solution for your needs. To explore our full range of products, visit our product page, and follow us on LinkedIn to stay updated with our latest news and developments.
