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LKAB Minerals offer a range of fine ground Aluminium Trihydrate (ATH) products manufactured in Europe.

Your contact for 

Magnus Johansson

Sales Manager Polymers & Coatings
Aluminium Trihydroxide mineral powder

Aluminium Trihydrate, also known as Aluminium Trihydroxide or Alumina Trihydrate, is derived from Bauxite ore. 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 ATH products is from a high purity source.

Flame retardant action

ATH decomposes when exposed 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 with a heat change of -1050J/g, a total loss of 34.7% of the original weight is seen. When incorporated into organic materials such as plastics, textiles and wood, the takes heat away from the flame front. Water vapour near the surface of the burning material leads to oxygen depletion reducing the burning rate of the gases.

Smoke suppression action

One reason for using ATH in flame retardant formulations is its action as a smoke suppressant. The high surface area aluminium oxide formed as a result of decomposition absorbs the combustion products responsible for the formation of soot particles.

ATH aplications

  • reinforced plastic

    ATH in polymers

    Within polymer materials ATH is used in applications such as glass reinforced plastic (GRP), rubber carpet backing, latex flexible foams, thermoplastics, thermosets and elastomers. ATH is compatible with a wide range of polymer types and provides the final product with fire retardancy and smoke suppression. If the ATH filled polymer is exposed to a fire it will reduce further combustion and flame spread.

  • flame retardant paint

    ATH in coatings, adhesives and sealants

    ATH is used in coatings for fire retardancy and because of its high whiteness. Within adhesives and sealants ATH also provides flame retardancy and additionally smoke suppression.

ATH standard grades

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

ATH packaging

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

The typical properties of ATH are:

Physical properties of ATH:

Specific gravity [g/cm³] 2.42
Refractive index 1.57
Hardness (Mohs) 2.5 – 3.5
Moisture content at 105°C/1h [%] 0.2
Loose bulk density [kg/l] 0.6 – 1.41
pH content (20% w/v slurry) 9

Chemical properties of ATH

Al2O3 [%] 65
H2O [%] 34.5

ATH mineral origin

The raw material used for the ATH products is from a high purity source.

ATH toxicology

The product is non-toxic and decomposes to aluminium oxide and water at 180°C. The material is stable under normal ambient conditions, concentrated acids and alkalis should be avoided. You can download the Safety Data Sheet in the box on the right.


Interested in what ATH can do for you?

Start by selecting your country to get the right contact person

My name is Magnus Johansson and I'm a ATH 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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Local time in United States is 02:59 AM (UTC -5)

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