Boron Phosphate (BPO4) Flame Retardant Synergist

Name: Boron Phosphate (BPO4) Flame Retardant Synergist
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 13308-51-5

Boron phosphate (BPO4) is a high-temperature-stable inorganic flame retardant synergist that combines the char-forming and vitrifying properties of boron with the acid-source activity of phosphate. At fire temperatures, BPO4 decomposes to form a boron-phosphorus oxide glass that acts as a viscous barrier coating over the polymer surface, suppressing fuel release and combustion. It is used in high-temperature ceramic-forming cable systems, specialty coatings, and as a co-synergist with aluminum phosphate or zinc borate in demanding fire-resistance applications.

Request Sample Get Best Price WhatsApp

Technical Specifications

appearance	White powder
moisture (%)	<0.5
B2O3 content (%)	29–31
P2O5 content (%)	69–71
particle size D50 (µm)	3–15
decomposition temperature (°C)	>1000

Applications

High-temperature fire-resistance cable insulation ceramicization compound
Synergist with aluminum phosphate in IEC 60331 circuit integrity cable systems
Specialty intumescent coating for extreme hydrocarbon fire protection
High-temperature refractory coating binder with FR and glass-forming properties
Co-synergist with zinc borate in halogen-free polymer systems requiring ceramic char

Key Features

Boron-phosphorus glass formation at fire temperatures creates a viscous intumescent barrier with excellent adhesion
Ultra-high thermal stability (>1000 °C) enables use in extreme-temperature fire protection scenarios
Synergistic with aluminum phosphate and zinc borate for enhanced ceramicization in fire-resistant cable systems
Halogen-free and non-toxic combustion products, meeting environmental and safety requirements for critical applications