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

Featured inFlame Retardants

DOPO is a reactive organophosphorus flame retardant widely used as a building block for halogen-free fire-retardant polymers and epoxy systems. Its P–H active group allows covalent bonding into epoxy resins, polyesters, and polyurethanes, providing durable flame retardancy without migration or leaching. DOPO-based systems meet stringent UL 94 V-0 ratings in printed circuit boards and electronic encapsulants.

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Technical Specifications

appearance	White crystalline powder
purity (%)	≥99
melting point (°C)	115–118
acid value (mgKOH/g)	≤1
phosphorus content (%)	14.3

Applications

Halogen-free flame retardant epoxy resins for PCB laminates
Reactive flame retardant additive for polyurethane foams and elastomers
Phosphorus-containing polyester and nylon engineering plastics
Encapsulants and potting compounds for electronic components
Synthesis intermediate for DOPO-HQ and other advanced FR derivatives

Key Features

Reactive P–H group enables covalent integration into polymer backbones for non-migratory flame retardancy
Halogen-free phosphorus-based mechanism reduces toxic gas emission during combustion
High thermal stability up to 260°C suitable for high-performance electronics processing
Versatile building block compatible with epoxy, polyester, polyurethane, and nylon systems