4-hydroxybenzenesulfonic acid

4-Hydroxybenzenesulfonic acid (CAS 98-67-9), also known as phenolsulfonic acid or sulfocarbolic acid, is an aromatic sulfonic acid used in industrial processing and formulation chemistry.

Where is 4-hydroxybenzenesulfonic acid used?

• Textile dyeing and leather tanning: fixative and pH regulator improving dye uptake
• Printing ink and packaging coatings: stabilizes pigment dispersions and extends shelf life against UV degradation
• Personal care: supports preservation systems and UV stabilization
• Paper treatment: buffering agent controlling acidity during pulp processing and surface sizing
• It functions as a pH buffer, UV stabilizer, and preservation agent in manufacturing workflows.

Good to know: Purity specifications may vary depending on application requirements.

Commercial specifications

• Aqueous solution, 65–70% concentration