Aluminum Phosphate (AlPO4) Ceramic Flame Retardant

Name: Aluminum Phosphate (AlPO4) Ceramic Flame Retardant
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 7784-30-7

Aluminum phosphate (AlPO4) is an inorganic, halogen-free flame retardant filler that promotes ceramicization of polymers at high fire temperatures, forming a rigid aluminum phosphate ceramic layer that provides structural integrity and thermal barrier protection. This ceramicization mechanism is particularly effective in cable compounds, where maintaining circuit integrity during fire is critical. AlPO4 is used in combination with other inorganic FR additives such as ATH, MDH, and zinc borate in halogen-free cable compounds targeting IEC 60331 fire-resistance performance.

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Technical Specifications

appearance	White powder
moisture (%)	<0.5
P2O5 content (%)	42–44
Al2O3 content (%)	30–32
particle size D50 (µm)	2–10
decomposition temperature (°C)	>1000

Applications

Fire-resistant circuit integrity cable compounds (IEC 60331) for emergency systems
Halogen-free low-smoke cable insulation with ceramicization FR system
Construction sealant and fire-stop compound with ceramic char reinforcement
Fire-resistant engineering plastic with ceramic barrier formation at high temperature
Intumescent coating additive contributing to high-temperature ceramic char stability

Key Features

Ceramicization mechanism forms rigid AlPO4 ceramic at fire temperatures, maintaining cable circuit integrity
High phosphorus content (P2O5 ~43%) contributes both condensed-phase and gas-phase FR activity
Halogen-free and inert above 1000 °C, generating no toxic decomposition products during fire
Synergistic with ATH, MDH, and muscovite mica in IEC 60331 fire-resistance cable compound systems