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MicaFort is a range of lamellar minerals manufactured from Phlogopite and Muscovite Mica which are distinguished by their high aspect ratio and high thermal stability.

Your contact for 

Magnus Johansson

Sales Manager Polymers & Coatings
MicaFort, Muscovite Mica in hands

LKAB Minerals exclusively source MicaFort from strategic partners and our own high quality deposits globally. By using our extensive mineral processing knowledge we produce a wide portfolio of Phlogopite and Muscovite Mica products to suit many applications.

The main markets for LKAB Minerals' MicaFort are polymers, coatings and construction. Please visit our industry uses section to find out more on how to use our products for your application.

The high aspect ratio platy particles provide an excellent balance of mechanical, thermal and dimensional properties when used as a functional filler.

Special properties are:

  • chemical inertness
  • hydrophilic nature
  • barrier-forming ability due to parallel particle alignment in matrices
  • high thermal stability (up to 1000°C)
  • elastic but tough particles
  • very low silica content for Phlogopite grades
  • excellent brightness and whiteness for Muscovite grades
  • high dielectric strength and electrical insulation properties

MicaFort applications

  • car side panel, automotive parts,

    MicaFort in polymers

    MicaFort finds increasing use in thermoplastic compounds. Compared to other minerals used to replace glass-fibers in polyamide MicaFort:

    • efficiently reduces warpage,
    • improves the surface finish,
    • gives an optimal balance of isotropic mechanical and dimensional properties and
    • an excellent reinforcement by itself or in combination with glass fiber.

    Our comparisons of MicaFort to other mineral fillers in polypropylene show that these compounds:

    • have a superior modulus,
    • show an isotropic reduction of the Coefficient of Linear Thermal Expansion (CLTE),
    • have an increased heat defection temperature
    • gain the opportunity of a density reduction.

    Other polymers benefitting from MicaFort's unique properties include PE, TPO and PBT. Duroplastic polymers like polyester, polyurethane, epoxy, and acrylic can all gain enhanced performance and durability. Elastomeric systems show improved reinforcement and excellent mould release properties.

  • Rusty bridge - anti-corrosion coating with MicaFort

    MicaFort in coatings and construction

    Industrial coatings such as marine, anti-corrosive and chemical resistant paints benefit from the inert nature of MicaFort and its ability to form a barrier to aggressive chemicals. It is also used in the production of wall boards, cladding as well as joint compounds and plasters. Read more following the links to our industry uses pages.

MicaFort standard grades

  • Dry ground: PD900, PD200, MD500, MD250, MD150, MD100
  • Micronised: MM75, SCM-3W, SX300, SX400
  • Silane coated: PW80S, PW30S
  • Wet ground: PW80, PW30, R302, R120, R90, P66

MicaFort packaging

Our MicaFort product range is available in paper sacks or big bags. Some of our MicaFort grades are available in bulk, please contact your sales representative to find out if this applies to the grade you like to purchase.

Typical properties of MicaFort are as following:

Physical properties of MicaFort

Specific gravity [g/cm³] 2.8
Refractive index 1.58 – 1.6
Hardness (Mohs) 2 - 3
pH (ISO 787-9) 8 - 9

Chemical properties of MicaFort

Phlogopite Mica is a hydrated silicate of potassium and magnesium whereas Muscovite Mica a hydrated silicate of potassium and aluminium is.

MicaFort origin

Muscovite is a constituent of acid igneous rocks like granite, pegmatite or alaskite, some regionally metamorphosed rocks and clastic sedimentary rocks, ad is a product of alteration. Most commercial deposits are derived from pegmatites which contain 1-2% and rarely up to 10% muscovite. Mica is found in many regions of the world in the form of pegmatite rock and mica schist.

Phlogopite is associated with metamorphosed limestone and ultrabasic rocks, particularly hydrothermal veins formed through metasomatism of magnesium-rich rocks as well as ultrabasic and carbonatite ring intrusions associated with ancient shield areas. LKAB Minerals' Phlogopite Mica is sourced from a major deposit in Finland.

MicaFort toxicology

Phlogopite and Muscovite Mica are non-toxic natural minerals. For further information please download the Safety Data Sheets in the box on the right.


Interested in what Phlogopite Mica can do for you?

Start by selecting your country to get the right contact person

My name is Magnus Johansson and I'm a Phlogopite Mica product expert located in United States.

If you are interested in what this product can do for you, please give me a call or send me a message.

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Mobile +1 513 375 2599

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08:00 AM - 17:00 PM

Local time in United States is 10:03 AM (UTC -5)

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