Used as phase-transfer catalyst in organic synthesis; ion-pair agent in chromatography; surface-active agent, solvent, intermediate, conditioner, antistatic, detergent sanitizer, softener for textiles/paper, antimicrobial, disinfectant, slimicidal/emulsifying agent, pigment disperser; structure-directing agent in zeolite synthesis.

Irritant to skin/eyes/respiratory; harmful if swallowed; combustible, avoid oxidizers; may cause allergic skin reactions or long-term organ effects. Low toxicity but handled with PPE, ventilate; stable but combustible; no specific hazard class listed, but follow quaternary ammonium safety protocols carefully.

Packaged in 5g, 25g, or 100g glass bottles for analytical use, or 25kg fiber drums, according to Sigma-Aldrich catalog options.