Alumina Trihydrate (ATH)

Product Overview

Alumina Trihydrate (ATH) from Hindalco is a high-purity, halogen-free flame‑retardant filler manufactured via sustainable, integrated manufacturing. ATH decomposes around 220 °C, releasing water vapor and creating an endothermic barrier that delays ignition, reduces smoke generation, and prevents flame spread—making it ideal for applications in gelcoats, thermal barrier coatings, and fire-rated composite structures. 

Key Benefits

• Effective Flame Retardancy: Releases water vapor to absorb heat and dilute combustible gases during thermal exposure

• Low Smoke, Non-Toxic Output: Halogen-free formulation with minimal corrosion and toxicity

• High Purity & Brightness: ≥ 99.7% Al(OH)₃ purity; brightness index above 96% for better surface aesthetics and optical stability

• Fine Particle Control: Particle size options from 1.2 to 20 µm (D₅₀), with tailored flow and filling behavior according to application needs 

Applications

• Gelcoats & FRP Laminates: Improved fire resistance in lamination and surfacing applications

• Thermal Barrier & Fire-Rated Composites: Effective in structural panels, pipe linings, and architectural profiles

• Cable Compounds & Electrical Housings: Used in polymeric cable sheaths for fire safety compliance

• Coatings & Resin Systems: Integrated into polyester, vinyl ester, and epoxy resins for flame retardancy in coatings and castings 

Handling & Safety

• Non-toxic & inert when handled correctly

• Use dust control measures (respiratory protection and ventilation) due to fine particulate nature

• Storage guidelines: Store in sealed, dry conditions to maintain low moisture and prevent clumping