What is Aluminium Trihydrate (ATH)? Uses, benefits, and key properties explained
Aluminium Trihydrate (ATH), also known as aluminium hydroxide (Al(OH)₃), is one of the most widely used industrial minerals in the world. Known for its versatility, ATH plays a critical role in applications ranging from flame retardancy to fillers in polymers and coatings.
This guide explores how ATH works, its key advantages, and where it delivers the most value in modern industrial processes.
What is Aluminium Trihydrate (ATH)?
Aluminium Trihydrate is a naturally occurring mineral derived primarily from bauxite ore. It is processed into a fine, white powder that offers a unique combination of chemical and physical properties.
Its defining feature is its ability to release water vapour when heated, making it highly effective as a flame retardant additive.
Key properties of ATH
ATH is valued across industries because of its:
- Flame-retardant properties: Releases water at ~200°C, cooling surfaces
- Non-toxic composition: Safe alternative to halogenated additives
- Whiteness and brightness: Ideal for coatings and fillers
- Low abrasiveness: Reduces wear on processing equipment
- Chemical stability: Performs reliably across applications
How does ATH work as a flame retardant?
When exposed to high temperatures, ATH undergoes an endothermic reaction, releasing chemically bound water as steam. This process:
- Absorbs heat from the surrounding environment
- Emits water vapour, diluting flammable gases
- Forms a protective residue that slows combustion
This makes ATH a preferred choice in fire safety applications, especially where low smoke and low toxicity are essential.
Common applications of ATH
Flame retardant fillers
ATH is widely used in:
- Cable compounds
- Construction materials
- Automotive components
Solid surface and polymers
Used as a filler in:
- Acrylic solid surfaces
- Engineered stone
- Plastics
Paints and coatings
Enhances:
- Durability
- Brightness
- Fire performance
Adhesives and sealants
- Improves viscosity and performance consistency.
Why choose ATH over other flame retardants?
Compared to alternatives, ATH offers:
- Environmentally responsible profile
- Cost-effective performance
- Low smoke emission
- Regulatory compliance advantages
Sustainability and safety benefits
ATH is often chosen in industries prioritising safer materials. It is halogen-free and contributes to reducing toxic emissions during combustion, aligning with stricter environmental and safety regulations.
Aluminium Trihydrate remains a cornerstone industrial mineral due to its multifunctional capabilities. Whether enhancing fire safety or improving material performance, ATH continues to support innovation across sectors. To learn more, explore the ATH product page, or contact LKAB Minerals for technical guidance. You can also follow LKAB Minerals on LinkedIn for the latest product updates, case studies, and industry insights.
What is Aluminium Trihydrate used for?
Aluminium Trihydrate is primarily used as a flame retardant filler in plastics, cables, and construction materials, as well as in coatings, adhesives, and solid surfaces.
Why is ATH considered a flame retardant?
ATH releases water vapour when heated, which cools the material and reduces the spread of flames.
Is Aluminium Trihydrate environmentally responsible?
Yes, ATH is non-toxic, halogen-free, and produces low smoke, making it a safer alternative to traditional flame retardants.
At what temperature does ATH decompose?
ATH begins to decompose at approximately 200°C, releasing water vapour in the process.
What industries use ATH?
Industries include construction, automotive, electronics, coatings, and polymer manufacturing.
