Pharmaceutical Materials

Product Name

4-Hydroxybenzenesulfonic Acid

Multiple Names

4-Hydroxybenzenesulfonic Acid;

Phenol-4-Sulfonic Acid;

Phenol-p-Sulphonic Acid;

P-Phenolsulfonic Acid Hydrate;

Phenolsulfuric Acid;

4-Hydroxy-Benzenesulfonicaci;

4-Hydroxyphenylsulfonic Acid;

4-Hydroxyphenylsulfonicacid;

4-Phenolsulfonic Acid;

4-Phenolsulfonicacid;

Benzenesulfonic Acid, P-Hydroxy-;

Benzenesulfonicacid,4-Hydroxy-;

Phenol-4-Sulfonicacidsolutio;

Phenol Sulphonate;

4-Hydroxybenzenesulfonic Acid;

4-Hydroxy-Benzenesulfonicacid;

P-Hydroxybenzenesulfonic Acid;

4-(4-Hydroxyphenyl)Azobenzenesulfonic Acid

CAS No. 98-67-9

EC No. 202-691-6

MF No. C6H6O4S

MW No. 174.20

For resin curing, it is the most important additive in the acid tin plating process, and also has the function of acid resin foaming, and is used as the curing agent for casting resin at room temperature.

Advantage of 4-Hydroxybenzenesulfonic Acid CAS No. 98-67-9

Soluble in water, hot alcohol and glycerin

An intermediate that is very important in the pharmaceutical industry

Stable, combustible, incompatible with strong oxidizing agents.

 

Aspect	Details
Chemical Name	4-Hydroxybenzenesulfonic Acid
Aliases	p-Hydroxybenzenesulfonic Acid, 4-Sulfophenol, Benzenesulfonic Acid, 4-Hydroxy-
CAS Number	98-67-9
EINECS Number	202-691-6
Molecular Formula	C₆H₆O₄S
Molecular Weight	174.17 g/mol
Physical State	Yellow hygroscopic crystalline powder that turns brown in air
Melting Point	50°C (decomposes)
Density	1.337 g/cm³ at 25°C
Solubility	Soluble in water
Applications	– Chemical Synthesis: Acts as a key intermediate in the production of dyes, pharmaceuticals, and surfactants. – Electroplating: Serves as a primary additive in acidic tin plating processes, enhancing coating quality and adhesion. – Resin Curing: Functions as a room-temperature curing agent for casting resins, facilitating cross-linking reactions. – Wastewater Treatment: Utilized to neutralize acidic industrial effluents through chemical precipitation.
Safety Precautions	Highly irritating to eyes, skin, and respiratory tract; may cause chemical burns upon contact. Handle under fume hoods using impervious gloves, goggles, and protective clothing. Store in cool, well-ventilated areas away from oxidizing agents and strong bases.

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