Aluminum Trihydrate (ATH), also known as Alumina Trihydrate, is a widely used halogen-free flame retardant and smoke suppressant. It decomposes when heated, releasing water vapor which cools the polymer surface, dilutes combustible gases, and forms a residual barrier layer.
| Property | Typical Value |
|---|---|
| Chemical Name | Aluminum Hydroxide (Al(OH)₃) |
| CAS No. | 21645-51-2 |
| Appearance | White powder |
| Al₂O₃ Content | ≥ 64.5% |
| Loss on Ignition | 34.6% (release of water) |
| Decomposition Temp. | ~ 220 °C |
| Oil Absorption | ≤ 25 ml/100g |
| Particle Size (D50) | 1–15 μm (customizable) |
| Customer Need | ATH Benefit |
|---|---|
| Non-toxic fire protection in public areas | ATH is halogen-free and safe for indoor use |
| Reduce smoke generation in fires | Releases water vapor to dilute smoke and gases |
| Improve electrical insulation | ATH has strong dielectric properties |
| Need low-cost filler with fire function | ATH serves as both flame retardant and filler |
Q1: Can ATH be combined with other flame retardants?
Yes. It is often used with Zinc Borate or APP for enhanced performance.
Q2: What is the ideal processing temperature range?
Keep below 220 °C to prevent premature water release.
Q3: Does it affect transparency?
Yes. ATH may reduce transparency and gloss in clear polymers.
