Reactive Organophosphorus Flame Retardant THPO

Overview

Tris(hydroxymethyl)phosphine oxide (THPO) is a reactive organophosphorus flame retardant with three hydroxyl groups, supplied as a colorless liquid. Because it reacts into the polymer, it gives durable, non-migrating flame retardancy.

Also known as

THPO; Trimethylolphosphine oxide; Tris(hydroxymethyl)phosphine oxide

CAS number

1067-12-5

Molecular formula

C3H9O4P

Molecular weight

140.07

Specifications

Test items	Specifications
Appearance	Colorless transparent liquid
Content /%	85-93
Water content /%	≤1.5
Na+ /%	≤2
Sulfate (SO4) /%	≤2
pH	7-8
Density /(g/cm³)	1.447

Applications

• Reactive flame retardant for polyurethane foams, elastomers and coatings
• Flame-retardant finishing of cotton and other cellulosic textiles
• Reactive flame retardant for epoxy and polyester resins
• Intermediate for phosphorus-containing polyols

Packaging

250 kg/drum; 1250 kg/IBC.

Storage

Store in tightly closed containers in a dry, clean and well-ventilated place, away from heat and direct sunlight.