Aluminium trihydrate (ATH)
Explore the benefits of Sibelco high-purity aluminium trihydrate (ATH, aluminium trihydroxide) in coatings, polymers, adhesives & sealants.
Aluminium trihydrate (ATH)
Aluminium trihydrate (ATH) is initially derived from bauxite ore, before being refined into a fine white powder.
Aluminium trihydrate (also known as ATH and aluminium trihydroxide, chemical formula Al (OH)3) is initially derived from bauxite ore, before being refined into a fine white powder.
About the product
Sibelco ATH is characterised by:
- high purity
- high whiteness
- relatively low density (2.4g/cm 3 ) compared to other mineral fillers (typically 2.7g/cm 3 )
- medium Mohs hardness of 3
- decomposition around 180 o C, releasing water (making it an excellent halogen-free flame retardant)
Our range is available in four grades:
- Fine: products with a defined PSD, top cut, colour, oil absorption and BET - typically used in applications critical to surface defects, colour, impregnation or FR-performance, often replacing fine precipitated ATH-grades.
- Medium / Coarse: products with a defined PSD and relatively high bulk density- typically used in applications where ease of handling and cost are important.
- Low Viscosity: products optimised for low oil absorption values. Particle shape and PSD are optimised for maximum packing performance, enabling higher filler loading levels in different resin systems.
- Special: coarse E-grades with a steep particle size distribution, well controlled on top cut and demagnetised - especially suitable for encapsulation of electrical components.
