Aluminum Hydroxide (ATH) Flame Retardant

Name: Aluminum Hydroxide (ATH) Flame Retardant
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 21645-51-2

Aluminum hydroxide (ATH) is the world's highest-volume inorganic flame retardant and smoke suppressant, functioning by endothermic decomposition that absorbs heat and releases water vapor to dilute combustible gases. It provides simultaneous flame retardancy, smoke suppression, and halogen-free compliance, making it the preferred choice for wire and cable insulation, thermosetting resins, and rubber compounds. ATH is available in a range of particle sizes and surface treatments to suit specific polymer matrices.

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Technical Specifications

appearance	White fine powder
moisture (%)	<0.3
Al2O3 content (%)	≥99.5
particle size D50 (µm)	1–80 (multiple grades)
specific surface area (m²/g)	3–10
decomposition temperature (°C)	180–200

Applications

Halogen-free wire and cable insulation and jacketing compounds (EVA, PE, EPDM)
Unsaturated polyester and vinyl ester FRP panels and laminates
Rubber roofing membranes and flooring with low smoke requirements
Artificial stone countertops and solid surface materials
Circuit board epoxy laminates and underfill encapsulants

Key Features

Triple function: flame retardancy, smoke suppression, and filling in a single halogen-free additive
Endothermic decomposition absorbs 1050 J/g, significantly reducing heat release rate
Available with silane or stearic acid surface treatment for improved polymer compatibility
Abundant supply and cost-effective pricing as the world's largest-volume FR mineral filler