Tetrakis(hydroxymethyl)phosphonium chloride
CAS 124-64-1
EC 204-707-7
Formula C4H12O4P.Cl
MW 190.56 g/mol
Flame Retardants Pulp & PaperTextile, Leather & PaperBuilding & ConstructionPlastics & Polymers Flame RetardancyCross-linking & Curing
Description
Tetrakis(hydroxymethyl)phosphonium chloride (THPC, CAS 124-64-1) is a phosphonium salt supplied as a solution and commercially available under trade names including Pyroset TKC and NSC 30698. It is registered under EC 204-707-7 and classified within the organophosphorus flame retardant category.
In textile finishing, THPC reacts with nitrogen-containing compounds such as urea or melamine to form a durable, cross-linked polymer network within cotton fibres, providing permanent flame retardancy that withstands repeated laundering. It is also used in leather treatment and paper manufacturing, where its reactive methylol groups enable covalent bonding with substrate materials rather than surface-only deposition.
THPC is supplied as an aqueous solution and is subject to REACH registration requirements for EU market access. Buyers should confirm concentration grade and packaging format at the point of enquiry, as these vary by application. Compliance documentation including SDS and technical data sheets is available on request.
In textile finishing, THPC reacts with nitrogen-containing compounds such as urea or melamine to form a durable, cross-linked polymer network within cotton fibres, providing permanent flame retardancy that withstands repeated laundering. It is also used in leather treatment and paper manufacturing, where its reactive methylol groups enable covalent bonding with substrate materials rather than surface-only deposition.
THPC is supplied as an aqueous solution and is subject to REACH registration requirements for EU market access. Buyers should confirm concentration grade and packaging format at the point of enquiry, as these vary by application. Compliance documentation including SDS and technical data sheets is available on request.
Physical Properties
| Melting Point | 154 °C |
| Boiling Point | 115°C/760mmHg |
| Density | 1.341 g/cm³ |
| Appearance | Clear light pink or yellow-green solution |
| Color | Clear light pink or yellow-green |
| Form | Solution |
| Water Solubility | >=10 g/100 mL at 20 ºC |
| Vapor Pressure | 0Pa at 25℃ |
| Refractive Index | n 20/D 1.512 |
| Log P | -9.8 |
Safety & Handling (Learn More)
Danger GHS05 GHS06 GHS07 GHS08 GHS09
H
H290H301H311H312H314H315H317H318H334H400H411
P
P233P234P260P261P262P264P270P271P272P273P280P284P316P317P321P330P363P390P391P403P405P406P501P264+P265P301+P316P302+P352P304+P340P332+P317P333+P317P342+P316P361+P364P362+P364P301+P330+P331P302+P361+P354P305+P354+P338
Trade & Regulatory
| HS Code | 29319019 |
| UN Number | 2810 |
| ADR Class | 6.1 |
| Packing Group | III |
| WGK (Germany) | 3 |
Other Names
tetrakis(hydroxymethyl)phosphanium chlorideTHPCT 0670pyrosettkcnci-c55061Pyroset TKCTetramethylolphosphonium chloride
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