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4-Hydroxybenzenesulfonic acid
Also known as: 4-Hydroxybenzenesulfonic acid · 98-67-9 · p-Phenolsulfonic acid · phenolsulfonic acid
- CAS No.
- 98-67-9
- Formula
- C6H6O4S
- Molar mass
- 174.18 g/mol
- PubChem CID
- 4765
Corrosive
Harmful / Irritant
Summary
4-Hydroxybenzenesulfonic acid (C6H6O4S), CAS 98-67-9. Common in labs and industry. Read on for hazards, storage, PPE and mixing rules.
Background
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Hazards
Attacks skin, eyes and materials.
May cause skin, eye or respiratory irritation.
Hazard statements
- H290
- H302
- H314
- H318
- H335
Storage
Keep at room temperature, below 30 °C, out of direct heat.
Store somewhere well-ventilated and away from any ignition source.
Metal drums or tinted glass, tightly sealed.
Strong acids, strong bases and powerful oxidizers.
Personal protective equipment
Nitrile or butyl, at least 0.4 mm thick.
Safety goggles with side shields.
A2 organic-vapor cartridge if the room isn't well ventilated.
Occupational exposure limits (HSE)
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EU harmonised classification (ECHA C&L)
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Transport
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FDA recalls & enforcement
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Compatibilities
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Open comparator with 4-Hydroxybenzenesulfonic acidPractical safety notes
- Corrosive. Wear chemical goggles, faceshield and chemical-resistant gloves. Have an eyewash within reach.
- Irritant / harmful. Ventilate the workspace and avoid skin contact.
Derived from the GHS classification shown above. These notes are generic guidance and do not replace the manufacturer's SDS or your local risk assessment.
FAQ
Is 4-Hydroxybenzenesulfonic acid flammable?+
4-Hydroxybenzenesulfonic acid (CAS 98-67-9) does not carry the GHS02 flame pictogram in our records. Always confirm with the manufacturer's SDS section 9 (flash point) before assuming a product is non-flammable.
What PPE should I wear when handling 4-Hydroxybenzenesulfonic acid?+
Chemical-splash goggles and a faceshield, chemical-resistant gloves (nitrile or butyl) and an apron are the minimum. Ventilation should be sufficient to keep vapours below the occupational exposure limit. Check SDS section 8 for material-specific breakthrough times.
How should 4-Hydroxybenzenesulfonic acid be stored?+
Store 4-Hydroxybenzenesulfonic acid (CAS 98-67-9) in tightly closed original containers, in a cool, dry, well-ventilated area away from incompatible materials. Segregate acids from bases and keep away from metals that can be attacked.
Is 4-Hydroxybenzenesulfonic acid dangerous for the environment?+
No specific environmental pictogram (GHS09) is listed in our records for 4-Hydroxybenzenesulfonic acid, but any chemical waste should be handled through your site's hazardous-waste procedure, not poured down the drain.
Where can I find the official Safety Data Sheet for 4-Hydroxybenzenesulfonic acid?+
Official, up-to-date SDS documents are published by each manufacturer (Sigma-Aldrich, Merck, Thermo Fisher, VWR, Carl Roth, etc.) and by regulators such as ECHA and NIOSH. This page is an educational summary and does not replace the manufacturer's SDS.
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