Aluminum hydroxide

Aluminum hydroxide, often abbreviated ATH, is an inorganic flame-retardant filler used in polymer compounds. On heating it decomposes endothermically and releases water vapor, absorbing heat and diluting the combustible gases near the material. The remaining aluminum-oxide-rich residue provides an additional mineral barrier contribution, while the filler can help reduce smoke development in suitable formulations.

The selected grade is a fine, uncoated powder for dispersion into the polymer or resin phase. Its decomposition begins at a lower temperature than magnesium hydroxide, which makes processing temperature a defining application feature. Particle distribution and resin compatibility affect viscosity, filler loading and mechanical behavior. ATH supplies a mineral flame-retardant mechanism; the complete compound establishes fire classification and electrical or mechanical properties.

Typical Applications

• Halogen-free cable compounds: Used in suitable low-temperature-processed cable insulation and sheath compounds, including EVA-rich systems. The dispersed mineral provides heat absorption and water release when exposed to fire.
• Unsaturated polyester composites: Used in resin formulations for molded panels, cast products and other filled thermoset articles. It adds a flame-retardant mineral phase while also contributing filler volume and surface characteristics.
• Elastomeric and coating systems: Used in compatible rubber compounds, coatings and backing materials where the processing temperature permits ATH incorporation. It supports reduced flame propagation and smoke formation through its mineral decomposition mechanism.

Specifications

Specifications describe the standard grade. Tolerance, test method and documentation package are confirmed per order.