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Tetrakis(hydroxymethyl)phosphonium sulfate (THPS)


Synonyms: Octakis(hydroxymethyl)diphosphonium sulfate; Tetrakis(hydroxymethyl)phosphonium sulfate (2:1); THPS
CAS No.: 55566-30-8 EC No.: 259-709-0
Molecular Weight: 406.278
Structural Formula: THPS
Molecular Formula: C8H24O12P2S
m.p.: -35 deg. C
b.p.: 111 deg. C
Specific gravity:
Solubility in water: min. 10g/100ml @ 18 deg. C


THPS may be obtained by reaction between PH3 (phosphine, co-product of sodium hypophosphite), sulfuric acid and formaldehyde.


THPS is an environment-friendly phosphonium salt biocide applied in industrial cooling systems, oil field operations, and paper-making industry. THPS can degrade to a nontoxic substance immediately after use. THPS is also applied as flame retardant in cotton, dacron-cotton fibers.


Items Specification
THPS active content 75% min.
appearance colorless or pale yellow liquid
density @ 25C 1.37~1.41 g/ml
phosphorus content 11% min.
pH 3~4
viscosity @ 20C 30~45 cps

Standard Packaging

250kg/plastic drum; 1250kg/IBC, ISO tank

Packaging for THPS 75%

Risks and Safety Information

THPS is regulated by UN as hazardous substance
Proper Shipping Name: Corrosive liquid, toxic, N.O.S.
UN 2922, Class 8, Sub-hazard 6.1, PG: III
Hazard Label: Corrosive, Toxic
R-Phrase: R:25 34
S-Phrase: S:26 27 36/37/39 45
For more information please see MSDS

Warning, Toxic!

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