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Surfactants REACH

Stearyltrimethylammonium chloride

CAS Number
112-03-8
EC Number
203-929-1
Chemical Formula
C21H46N.Cl
Molecular Weight
348.0 g/mol
Industries:Textile, Leather & PaperWater TreatmentLubricants & MetalworkingPersonal Care & Cosmetics

Description

Stearyltrimethylammonium chloride (CAS 112-03-8 ), commonly abbreviated as STAC, is a quaternary ammonium cationic surfactant derived from stearic acid. It functions as a conditioning agent, biocide, and emulsifier across personal care, textile, and industrial processing applications. In personal care formulations, STAC deposits onto negatively charged hair and skin surfaces to deliver conditioning, detangling, and softening effects in rinse-off and leave-on products. Textile and leather processors use it as a fabric softener and fiber lubricant. This chemical reduces static charge and improves handle in finishing baths. Water treatment operations employ STAC for its biocidal activity against bacteria and algae in industrial cooling systems and process water. In metalworking and lubricant formulations, it acts as an emulsifier and anti-corrosion additive, improving the stability of cutting fluids and protective coatings. This versatility makes it a staple in industrial chemical manufacturing. Stearyltrimethylammonium chloride is supplied as a white to off-white paste or flakes, and as aqueous solutions at varying active concentrations. Technical and cosmetic grades are the most commonly available for industrial use. Cosmetic-grade material meets purity requirements for personal care use. Packaging typically ranges from drums to IBC containers depending on grade and concentration. Proper storage ensures the stability of the surfactant over time. Contact us for supply of Stearyltrimethylammonium chloride Request Quote

Other Names (Synonyms)

1-Octadecanaminium, N,N,N-trimethyl-, chloride | Trimethylstearylammonium chloride | Stac | Cation AB | Aliquat 7 | Nissan cation AB | Quaternium-10 | Arquad 18

Key Technical Features

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

Physical Properties

Boiling Point249°C[at 101 325 Pa]
Density0.91[at 20℃]
AppearanceWhite powder Or Light yellow to white cream
ColorWhite
Formpowder to crystal
Water SolubilitySoluble in water 1.759 mg/L @ 25°C.
Vapor Pressure0Pa at 25℃
pH5.5-8.5 (20℃, 0.05% in H2O)
Log P3.61 at 25℃

Safety & Handling

Danger
GHS05· CorrosiveGHS06· ToxicGHS07· IrritantGHS09· Environment

Hazard Statements

H302Harmful if swallowed
H311Toxic in contact with skin
H312Harmful in contact with skin
H314Causes severe skin burns and eye damage
H318Causes serious eye damage
H400Very toxic to aquatic life
H410Very toxic to aquatic life with long lasting effects

Precautionary Statements

P260Do not breathe 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.
P273Avoid release to the environment.
P280Wear protective gloves/protective clothing/eye protection/face protection.
P316Get emergency medical help immediately.
P317Get emergency medical help.
P321Specific treatment (see … on this label).
P330Rinse mouth.
P363Wash contaminated clothing before reuse.
P391Collect spillage.
P405Store locked up.
P501Dispose of contents/container in accordance with local regulations.
P265Wash … thoroughly after handling.
P317Get emergency medical help.
P352IF ON SKIN: Wash with plenty of water.
P340IF INHALED: Remove person to fresh air and keep comfortable for breathing.
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 Code29239000
UN Number1759
Storage Class8B - Non-combustible corrosive hazardous materials
WGK (Germany)3