LKAB Minerals offer a range of fine ground Aluminium Trihydrate (ATH) products from European manufacturing locations.

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Paul Pasquino

Paul Pasquino

President / Managing Director Americas

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You might know Aluminium Trihydrate also as:

  • Aluminium Trihydroxide
  • Alumina Trihydrate

This mineral is derived from Bauxite ore. Hereafter this natural ore is refined to a fine white powder via the Bayer process. After washing and drying it is used as the feedstock for a wide range of Alumina chemicals. The raw material used for the products is from a high purity source.

Applications using ATH

Our international customers use this particular mineral for a variety of end-products, for example:

For this latter two applications, we also offer our UltraCarb product. To understand which mineral is the best solution for your process we advise you to contact your area sales manager.

Important properties ATH

The following properties are important to most applications:

  • Exceptional whiteness
  • Good translucency
  • Resistance to chemicals and weathering
  • Impact resistance

The softness of the mineral contributes to making materials machinable with loading levels between 40% and 70% becoming possible and providing the best properties.

ATH - Aluminium Trihydroxide mineral powder

Standard grades

  • General grades: M6B, M8B, M10B, M15B, M20B, M25B
  • Low viscosity grade: B302


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

Typical properties of ATH

Physical properties of ATH:

Specific gravity [g/cm³]
Refractive index
Hardness (Mohs)
1.5 - 3.5
Moisture content at 105°C/1h [%]
Loose bulk density [kg/l]
0.6 - 1.41
pH content (20% w/v slurry)

Chemical properties of ATH

Al2O3 [%]
H2O [%]

Safety Data Sheet

Downloads on request

ATH - Frequently Asked Questions

  • Natural vs Synthetic ATH – which is best and what are the differences?


    The significant difference is their particle size. Each product has its advantages. The Synthetic version can achieve even finer particle sizes due to the nature of the crystallisation process. However, because of this Synthetic material is considerably more expensive. All LKAB Minerals ATH is natural.

  • What is the colour of ATH, how bright is it?


    Aluminium Trihydrate is a  brilliant white powder with L* values above 99 for finer grades. It can extend Titanium dioxide and also has little effect on darkening lighter colours due to its brightness.

  • Is ATH a halogen-free flame retardant?


    Some flame retardants are Halogen based, which is widely considered as detrimental to both the environment and any personnel nearby when the product is going through its mode of action. Our ATH is HFFR (Halogen-Free-Flame-Retardant). This quality also adheres to EU regulations.

  • How does ATH work?


    The product decomposes when you expose it to heat yielding aluminium oxide and water by the following reaction: 2Al(OH)3 Al2O3 + 3H2O

    The decomposition starts at 180˚C and is endothermic.

  • Where do you produce ATH and how do you make it?


    We produce our mineral at our site in Moerdijk, Netherlands. It is made from an ore called Bauxite that is utilised in the Aluminium industry.

  • What is the source of the raw material (bauxite) from which you make ATH?


    Bauxite is a red clay-looking ore. It is widely made up of various Aluminium Oxides. Many industries within the Chemical industry use Bauxite. Aluminium metal production uses the most Bauxite, while only a small percentage finds its way into Flame retardants such as ATH. Using the Bayer process raw Bauxite is transformed over several stages into Aluminium Trihydrate, and several steps later Aluminium metal.

  • Can ATH provide other characteristics other than Flame Retardancy?


    You can also use the minerals as a pigment, filler and as a matting agent. However, its primary characteristic is as a flame retardant.