DOPO (9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide)

Name: DOPO (9,10-Dihydro-9-oxa-10-phosphaphenanthrene-10-oxide)
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 35455-29-9

DOPO (9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide) is the key reactive phosphorus intermediate used to synthesize a broad family of halogen-free flame retardants for epoxy resins, polyesters, and vinyl ester resins. Its reactive P–H bond allows covalent incorporation into epoxy hardeners, novolacs, and vinyl ester backbones, providing permanent non-leachable flame retardancy. DOPO-based FR systems are the dominant approach in halogen-free printed circuit board (PCB) and copper clad laminate (CCL) manufacturing.

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Technical Specifications

appearance	White crystalline solid
moisture (%)	<0.2
purity (GC, %)	≥99
melting point (°C)	117–120
acid value (mgKOH/g)	<0.5
phosphorus content (%)	14.3–14.7

Applications

Reactive halogen-free FR intermediate for PCB and copper clad laminate (CCL) epoxy systems
Synthesis of DOPO-based epoxy hardeners and curing agents for electronics
Flame-retardant vinyl ester resin formulations for FRP composite panels
Reactive FR additive for polyester and PBT fiber and film applications
Building block for DOPO-HQ, DOPO-BQ, and other advanced reactive FR derivatives

Key Features

Reactive P–H functionality allows covalent incorporation into thermoset resins for permanent FR without leaching
Compact bicyclic phosphine oxide structure delivers high phosphorus efficiency in aromatic polymer systems
Foundation molecule for the entire DOPO-derivative halogen-free FR family used in PCB manufacturing
High purity (>99%) ensures reproducible reactivity in epoxy laminate and prepreg production