Project Description

DEEP is a new phosphor series additive flame retardant.

Being a colorless or light yellow transparent liquid, DEEP features high phosphorus content, good flame retardance performance, less addition, low price, convenient usage, low viscosity, and many other special advantages.

DEEP can dissolve in water and many organic solvents.

Diethyl Ethyl Phosphonate

Cas No.:78-38-6
Molecular Formula: C6H15O3P
Molecular Weight:166.16


AppearanceColorless to yellowish transparent liquid
Specific gravity(20℃)1.020-1.030
Acid content≤1.0 mgKOH/g
Water content≤0.1%
Phosphorus content18.6%
Viscosity(25℃)1.5 mPa•s


DEEP is a new efficient organophosphorus flame retardant. It can be added to various rigid polyurethane foams and foaming systems. Its flame retardant efficiency is 1.5~2 times TCPP.

DEEP is low in viscosity and does not contain halogen. Its chemical stability is good in the polyether polyol-isocyanate bicomponent system. Besides, DEEP is an efficient viscosity reducer. It improves the operability of aqueous foaming hard bubble and rigid polyurethane foam systems.

The DEEP dosage can be 20~25 shares for rigid foam complying with standard flame-retardant B2. However, DEEP is unsuitable for the system built with isocyanates, including a prepolymer and one-component polyfoam.


One year in shadow.


200kgs/iron drum.


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