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.
ATH product uses
ATH for solid surfacing
ATH is a key ingredient in the composite material referred to as solid surfacing (or artificial stone or synthetic marble/onyx). Solid surfacing that is widely used for kitchen, bathroom and laboratory counter tops benefits from the addition of ATH as it assists with most of the properties required for this material.
ATH in polymers
Within polymer materials ATH is used in applications such as
- glass reinforced plastic (GRP)
- rubber carpet backing
- latex flexible foams
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.
ATH in coatings, adhesives & 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.
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 180oC 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.
|Specific gravity (g/cm³)
||2.5 - 3.5
|Loose bulk density (kg/l)
||0.6 - 1.41
|pH content (20% w/v slurry)
|Moisture content at 105°C/1hr (%)
|Aluminium as Al2O3 (%)
|Hydrate as H2O (%)
ATH standard grades
||M6B, M10B, M15B, M20B, M25B
|Low viscosity grade:
Our ATH product range is available in paper sacks or big bags. Due to the products conditions no bulk solution is available.
The raw material used for the ATH products is from a high purity source.
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.
Please contact us for datasheets on a single grade or further information on our ATH product range. You can find our sales contact by choosing your country in the upper right expert box of this page.