Diethyl Ethylphosphonate (DEEP)

Name: Diethyl Ethylphosphonate (DEEP)
Brand: Chemzip
Price: 1 USD
Availability: InStock

CAS Number: 78-38-6

Diethyl ethylphosphonate (DEEP) is an organophosphonate liquid flame retardant and reactive diluent used in polyurethane foam and epoxy systems. Its phosphonate structure (P–C bond) provides superior hydrolytic stability over phosphate esters (P–O–C bond), making it particularly suitable for applications requiring long-term durability in humid environments. DEEP is valued for its low viscosity, good compatibility with polyols, and ability to function as both a physical FR additive and a reactive component in foam formulation.

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Technical Specifications

appearance	Colorless to pale yellow liquid
purity (GC, %)	≥98
boiling point (°C)	198–200
phosphorus content (%)	21–22
density (20°C, g/cm³)	1.025–1.030
refractive index (nD20)	1.415–1.418

Applications

Rigid and flexible polyurethane foam flame retardant with hydrolytic stability
Epoxy coating and encapsulant flame retardant reactive diluent
Polyester and polycarbonate resin FR with improved thermal stability
Hydraulic fluid and metalworking fluid fire-resistant component
Polyurethane adhesive and sealant flame retardant additive

Key Features

P–C bond structure provides superior hydrolytic stability versus phosphate esters in humid conditions
High phosphorus content (21–22%) delivers effective FR performance at low loading levels
Low color and good compatibility with polyols for clear or lightly pigmented foam applications
Liquid form and low viscosity enable direct addition to polyol blend without pre-dissolution