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Surfactants - Anionic Available — Bulk Only

Tetrakis(hydroxymethyl)phosphonium Sulfate (THPS)

CAS 55566-30-8 · Formula C8H24O12P2S · MW 406.28 g/mol

A low-residue phosphonium biocide for microbial control in oilfield and industrial water systems. it is used as a broad-spectrum biocide in industrial and oilfield water treatment and to make crease-resistant and flame-retardant finishes for textiles.

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UN Number
UN 2922
Hazard Class
Class 8
HS Code
2931.90
At a Glance
Material Family
Surfactants - Anionic
Record Type
Pure compound
Primary Role
Cleaning / Degreasing · Wetting
Functional Roles
Cleaning / Degreasing Wetting Biocidal Action
Industries Served
HI&I Cleaning Oil & Gas
Applications & Use Cases
  • ▸ Biocide: Broad-spectrum microbiocide for industrial and process waters.
  • ▸ Oilfield water treatment: Microbial control in hydraulic-fracturing and produced water.
  • ▸ Textile finishing: Crease-resistant and flame-retardant textile finishes.
Physical Properties
Melting Point
-35 °C
Boiling Point
111 °C at 760 mmHg
Density
1.381 at 22 °C
Solubility
≥ 100 mg/mL at 18 °C
Vapor Pressure
32 mmHg at 51 °C; 150.5 mmHg at 73 °C
Flash Point
> 93 °C
Safety & Handling
Full SDS available on request

A grade-specific Safety Data Sheet (SDS) — with the complete hazard classification, handling precautions, and transport information — is supplied with every shipment and available on request. Confirm all safety and regulatory details against the SDS for your specific grade.

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DOT / UN Transport Classification
DOT hazard class 8 placard
UN / DOT NumberUN 2922
Hazard Class / DivisionClass 8
Proper Shipping NameCorrosive liquids, toxic, n.o.s.

Transport classification per the UN Model Regulations / 49 CFR 172.101 Hazardous Materials Table. Confirm against the grade-specific SDS (Section 14) before shipping.

HS / Tariff Classification
Harmonized System (HS) Code — 6-digit international heading
2931 . 90
Chapter 29
Organic chemicals
Heading 29.31
Internationally harmonized (WCO HS)
Subheading 2931.90
6-digit international code — national tariff line adds further digits
Chemical Identity
CAS Number
55566-30-8
Molecular Formula
C8H24O12P2S
Molecular Weight
406.28 g/mol
IUPAC Name
bis(tetrakis(hydroxymethyl)phosphanium);sulfate
PubChem CID
41478
InChI Key
YIEDHPBKGZGLIK-UHFFFAOYSA-L
Synonyms & Trade Names
TETRAKIS(HYDROXYMETHYL)PHOSPHONIUM SULFATE Retardol S Pyroset TKO Octakis(hydroxymethyl)phosphonium sulfate NCI-C55050 Phosphonium, tetrakis(hydroxymethyl)-, sulfate (2:1) (salt) Bis(tetrakis(hydroxymethyl)phosphonium)sulfate (salt) bis[tetrakis(hydroxymethyl)phosphonium] sulfate Phosphonium, tetrakis(hydroxymethyl)-, sulfate (2:1) TETRAKIS(HYDROXYMETHYL)PHOSPHONIUM SULFATE [HSDB] BIS(TETRAKIS(HYDROXYMETHYL)PHOSPHONIUM) SULFATE PROBAN NX
Full Description

Tetrakis(hydroxymethyl)phosphonium Sulfate (CAS 55566-30-8) is a quaternary phosphonium salt. it is used as a broad-spectrum biocide in industrial and oilfield water treatment and to make crease-resistant and flame-retardant finishes for textiles.

Frequently Asked Questions

What is THPS used for?

Tetrakis(hydroxymethyl)phosphonium Sulfate (THPS, CAS 55566-30-8) is a broad-spectrum microbiocide used in industrial and oilfield water treatment, for microbial control in hydraulic-fracturing and produced water, and to make crease-resistant and flame-retardant finishes for textiles.

What is THPS chemically?

THPS is a quaternary phosphonium salt with formula C8H24O12P2S. The 'tetrakis' prefix denotes the four hydroxymethyl groups bound to the central phosphonium; it is supplied as an aqueous solution.

What does 'tetrakis' mean in the name?

'Tetrakis' is a multiplying prefix meaning four, used for complex substituents. In THPS it indicates four hydroxymethyl groups attached to the phosphonium cation.

How does THPS ship under DOT?

THPS solution is assigned UN 2922 (TETRAKIS(HYDROXYMETHYL)PHOSPHONIUM SULFATE SOLUTION), a corrosive substance. Confirm the packing group, packaging, and documentation against the current SDS before shipping.

What packaging and documentation does RawSource supply?

RawSource supplies THPS solution in bulk drums, totes, and IBCs with CoA and SDS available on request. Request a bulk quote with your target concentration and volume for current pricing and lead time.

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Disclaimer. Information on this page — including properties, identifiers, hazard, transport (DOT/UN) and tariff (HS) classifications, and applications — is provided for general reference and is compiled from authoritative public sources (e.g. PubChem/ECHA, 49 CFR 172.101, the Harmonized Tariff Schedule). Values are typical and are not a guaranteed specification; the Certificate of Analysis (CoA) for the lot purchased governs. Products are sold for industrial and professional use only. Nothing here is a medical, health, or efficacy claim or advice. Always consult the current Safety Data Sheet (SDS) before handling, storage, transport or disposal, and confirm regulatory status, classification and suitability for your application and jurisdiction. Hazard, transport and tariff classifications must be verified for your specific shipment. RawSource makes no warranty, express or implied, and assumes no liability for use of this information. Trademarks. Third-party trademarks and brand names are the property of their respective owners; any reference is nominative — used only to identify a comparable product — and does not imply affiliation with, sponsorship by, or endorsement by the trademark owner.
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