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Organometallic Compounds REACH

Tetrakis(hydroxymethyl)phosphonium chloride

CAS Number
124-64-1
EC Number
204-707-7
Chemical Formula
C4H12O4P.Cl
Molecular Weight
190.56 g/mol
Industries:Plastics & PolymersBuilding & ConstructionTextile, Leather & PaperPulp & Paper

Description

Tetrakis(hydroxymethyl)phosphonium chloride (CAS 124-64-1 ), commonly sourced as THPC, is a reactive phosphorus-based flame retardant used across textile, leather, and industrial substrate treatments. It functions by chemically bonding into fibrous or polymer matrices during curing, delivering durable flame retardancy rather than surface-level protection for various materials. In textile finishing, THPC is reacted with nitrogen-containing compounds such as urea or melamine to produce wash-durable flame-retardant finishes on cotton and cellulosic fabrics. This process is widely specified for workwear, military, and protective clothing. Leather processors apply it during wet finishing to meet fire resistance standards required in automotive upholstery. In pulp and paper manufacturing, it functions as both a flame retardant and a cross-linking agent, improving dimensional stability in treated specialty papers and industrial products. Building and construction applications include flame-retardant treatment of nonwoven materials and insulation substrates where regulatory compliance drives specific material requirements. THPC is supplied as an aqueous solution, typically at 80% active content, which is the standard commercial concentration for industrial use in most manufacturing sectors. It is available in technical grade, with supply in drums and intermediate bulk containers to suit both formulators and large-scale processors requiring consistent chemical supply. Contact us for supply of Tetrakis(hydroxymethyl)phosphonium chloride Request Quote

Other Names (Synonyms)

THPC | Pyroset TKC | TETRAMETHYLOLPHOSPHONIUM CHLORIDE | Retardol C | Phosphonium, tetrakis(hydroxymethyl)-, chloride (1:1) | NCI-C55061 | Tetrakis(hydroxymethyl)phosphochloride | Tetrahydroxymethylphosphonium chloride

Key Technical Features

  • High Purity Grade standard
  • Consistent Batch Quality
  • Full Regulatory & REACH Support
  • Global Logistics Network enabled

Physical Properties

Melting Point154 °C
Boiling Point115°C/760mmHg
Density1.341 g/cm³
AppearanceClear light pink or yellow-green solution
ColorClear light pink or yellow-green
FormSolution
Water Solubility>=10 g/100 mL at 20 ºC
Vapor Pressure0Pa at 25℃
Refractive Indexn 20/D 1.512
Log P-9.8

Safety & Handling

Danger
GHS05· CorrosiveGHS06· ToxicGHS07· IrritantGHS08· Health HazardGHS09· Environment

Hazard Statements

H290May be corrosive to metals
H301Toxic if swallowed
H311Toxic in contact with skin
H312Harmful in contact with skin
H314Causes severe skin burns and eye damage
H315Causes skin irritation
H317May cause an allergic skin reaction
H318Causes serious eye damage
H334May cause allergy or asthma symptoms or breathing difficulties if inhaled
H400Very toxic to aquatic life
H411Toxic to aquatic life with long lasting effects

Precautionary Statements

P233Keep container tightly closed.
P234Keep only in original packaging.
P260Do not breathe dust/fume/gas/mist/vapours/spray.
P261Avoid breathing dust/fume/gas/mist/vapours/spray.
P262Do not get in eyes, on skin, or on clothing.
P264Wash … thoroughly after handling.
P270Do not eat, drink or smoke when using this product.
P271Use only outdoors or in a well-ventilated area.
P272Contaminated work clothing should not be allowed out of the workplace.
P273Avoid release to the environment.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P284In case of inadequate ventilation wear respiratory protection.
P316Get emergency medical help immediately.
P317Get emergency medical help.
P321Specific treatment (see … on this label).
P330Rinse mouth.
P363Wash contaminated clothing before reuse.
P390Absorb spillage to prevent material damage.
P391Collect spillage.
P403Store in a well-ventilated place.
P405Store locked up.
P406Store in a corrosion-resistant/… container with a resistant inner liner.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P316Get emergency medical help immediately.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
P317Get emergency medical help.
P317Get emergency medical help.
P316Get emergency medical help immediately.
P364Take off immediately all contaminated clothing and wash it before reuse.
P364Take off contaminated clothing and wash it before reuse.
P331Rinse mouth. Do NOT induce vomiting.
P354IF ON SKIN: Take off immediately all contaminated clothing. Rinse skin with water/shower.
P338IF IN EYES: Rinse cautiously with water for several minutes. Remove contact lenses, if present and easy to do. Continue rinsing.

Trade & Regulatory

HS Code29319019
UN Number2810
ADR Class6.1
Packing GroupIII
WGK (Germany)3