Octadecyl dimethyl benzyl ammonium chloride (Benzyldimethyl octadecyl ammonium chloride) is a cationic surfactant with the chemical formula C₂₇H₅₀ClN, and its CAS number is 122-19-0. 

‌Appearance‌: White needle-like crystals or paste ‌

‌Solubility‌: Soluble in water, insoluble in organic solvents such as chloroform and methanol ‌

‌Melting Point‌: 65-67°C (common value) Main purpose

Surfactants: Used as textile printing and dyeing auxiliaries (such as dyeing stabilizers DC), they have anti-static and softening functions.

Antibacterial agents: Used in antibacterial formulations for medicine and cosmetics.

Lubricant thickener: As an additive in lubricating oil to enhance stability. Safety

Acute toxicity: LD₅₀ for rats via oral route is 1250 mg/kg, and LC₅₀ for mice is 760 mg/kg (belonging to the low toxicity category) ‌

Ecological impact: There are no clear ecological toxicity data yet. 

Storage should be carried out in a non-strongly alkaline environment. It is prone to hydrolysis.

For industrial use, safety operating procedures must be followed to avoid direct contact with skin or inhalation of dust.