4-Chlorobenzoic acid is a fundamental halogenated aromatic carboxylic acid intermediate widely applied in pharmaceutical synthesis, agrochemicals, dyestuffs and fine chemical industry. It contains reactive carboxyl and para-chloro substituent, easily undergoing esterification, amidation, substitution and decarboxylation reactions to construct various aromatic molecular frameworks. It is commonly used for manufacturing anti-inflammatory drugs, antibacterial agents, cardiovascular drug intermediates and pesticide raw materials. In dyestuff industry, it serves as an important raw material for synthesizing azo dyes and organic pigments. It is also used as analytical reagent, organic synthesis raw material and cosmetic additive intermediate with stable chemical performance and wide downstream applicability.

This compound has mild irritant properties and low acute toxicity. Inhalation of fine dust may cause respiratory discomfort such as sore throat and cough. Direct skin contact may lead to slight redness and itching, while eye contact can cause obvious irritation and burning sensation. Accidental ingestion may result in mild gastrointestinal symptoms including nausea and abdominal discomfort. During handling, work in well-ventilated environment and wear protective gloves, goggles and dust mask. Avoid contact with strong oxidants and strong alkalis. Keep container tightly sealed for moisture-proof storage. Waste and contaminated packaging should be disposed of in accordance with hazardous waste rules to prevent water and soil pollution.