Product Name: Sodium 4-Hydroxybenzene Sulfoate (Anhydrous)
Chemical Formula: C6H5NaO4S
Synonyms: Sodium Parahydroxybenzenesulfonate, Sodium p-Hydroxybenzene sulfonate
CAS Number: 825-90-1
Recommended Use: Often found in dye manufacturing, laboratory research, some pharmaceutical production, and occasionally as a reagent in chemical synthesis.
Supplier: Details should be available on the product label and purchase documentation, or users can contact the manufacturer’s safety and compliance team for more data.
Hazard Classification: Not classified as hazardous according to the latest GHS criteria, though contact or inhalation brings irritant risks.
Physical Hazards: Powder can cause dust explosions in confined areas if mixed with air.
Health Hazards: Can irritate the eyes, skin, and respiratory tract upon direct exposure.
Environmental Hazards: Practically not highly toxic—runoff enters waterways, raising local sodium salts.
Hazard Pictograms: May include the exclamation mark for irritant risks.
Signal Word: Warning
Precautionary Statements: Avoid breathing dust, wash thoroughly after handling, use personal protective equipment.
Chemical Name: Sodium 4-Hydroxybenzene Sulfoate (Anhydrous)
Concentration: ≥98% pure (commercial grades); minor traces of water or residual organic compounds may be present.
Impurities: Less than 2%, which could include other salts or residual solvents, depending on supplier and batch.
Inhalation: Move the affected person to fresh air, keep at rest and seek medical attention if symptoms continue such as persistent cough or shortness of breath.
Skin Contact: Wash skin with plenty of mild soap and water. Remove contaminated clothing and launder before reuse.
Eye Contact: Rinse eyes cautiously with lukewarm water, lifting eyelids. Seek help if irritation remains.
Ingestion: Rinse mouth with water and drink plenty of fluids; do not induce vomiting. If feeling unwell, contact a doctor or local poison control center.
Acute Symptoms: Can include irritation, coughing, burning sensation in the eyes, nose, or mouth, and mild itching or redness at the contact site.
Suitable Extinguishing Media: Use water spray, foam, dry chemical, or carbon dioxide. Avoid powerful water jets which can spread powder.
Special Hazards: During intense fires, thermal decomposition releases sulfur oxides, sodium oxides, and potentially toxic fumes.
Protective Equipment: Firefighters pull on self-contained breathing apparatus and chemical-resistant suits to keep exposure minimized.
Advice for Firefighters: Move containers from fire zone if it can be done safely. Cool nearby containers with flooding quantities of water. Prevent fire-control water from entering waterways.
Personal Precautions: Use suitable PPE such as chemical goggles, gloves, and a dust mask or respirator. Avoid breathing dust. Ventilate the room.
Environmental Precautions: Prevent spill from reaching drains, surface water, or soil by using booms, diking, or sand barriers.
Cleanup Methods: Scoop up spilled powder with non-sparking tools, collect in labeled waste containers for disposal. Sprinkle water mist to keep dust from rising if needed. Clean surfaces thoroughly after collection.
Precautions for Safe Handling: Wear proper lab clothing, gloves, and eye protection. Pour material gently to prevent dust clouds. Wash hands after use, and avoid eating or drinking in work areas.
Conditions for Safe Storage: Store tightly closed in a cool, dry, and well-ventilated place, away from heat sources and moisture. Avoid proximity to acids and oxidizers. Keep raw materials labeled and segregated.
Incompatible Materials: Store separate from strong acids, oxidizers, and reactive metals like aluminum, which could cause exothermic reactions.
Exposure Limits: No established occupational exposure limit, although prudent practices advise keeping dust levels as low as reasonably practical.
Engineering Controls: Use local exhaust ventilation and process enclosure to reduce airborne dust.
Personal Protective Equipment: Workers should put on chemical splash goggles, gloves (nitrile or PVC), and dust masking respirators where airborne dust may arise.
Hygiene Measures: Remove and wash contaminated clothing. Clean exposed skin before food breaks or upon leaving lab or worksite.
Appearance: White to slightly beige crystalline powder.
Odor: No significant odor.
Odor Threshold: Not applicable.
pH: Around 6–8 in 10% aqueous solution.
Melting Point: Over 300°C (may decompose on further heating).
Boiling Point: Decomposes before boiling.
Flash Point: Not flammable as supplied.
Evaporation Rate: Not applicable.
Flammability: Not flammable under normal use conditions.
Vapor Pressure: Negligible.
Vapor Density: Not applicable.
Solubility: Readily dissolves in water, limited solubility in alcohols.
Partition Coefficient (log Kow): Not expected to bioaccumulate; low log Kow.
Auto-ignition Temperature: No reliable data, likely not susceptible as pure solid.
Decomposition Temperature: Decomposes over 300°C, giving off sulfur oxides.
Viscosity: Not relevant for solid.
Chemical Stability: Stable in sealed containers stored at room temperature and out of direct sunlight.
Reactivity: Not strongly reactive, but dusty environments can lead to static discharge.
Conditions to Avoid: Exposure to high heat, sparks, open flames, and moisture.
Materials to Avoid: Strong acids and oxidizing agents produce hazardous decomposition products including toxic gases.
Hazardous Decomposition Products: Combustion or strong acid contact releases sulfur oxides, sodium oxides, and aromatic compounds.
Likely Routes of Exposure: Inhalation of dust, skin and eye contact, and accidental ingestion.
Acute Effects: Dust can irritate mucous membranes, cause coughing, redness, or itching. Ingestion may upset stomach but is not likely dangerous in small amounts.
Chronic Effects: Prolonged skin contact may dry or crack skin. There’s little evidence of significant chronic toxicity under regular lab safety protocols.
Carcinogenicity: No classification as a known or suspected carcinogen.
Target Organs: No target organ toxicity documented at expected workplace exposures.
Sensitization: No data suggesting allergic sensitization.
Symptoms of Overexposure: Eye and skin redness, respiratory irritation, coughing, and mild stomach discomfort in rare ingestion cases.
Toxicity to Fish and Aquatic Organisms: May increase water salinity and potentially disrupt sensitive aquatic balance in local environments.
Persistence and Degradability: Breaks down over time in water to simple ions and does not bioaccumulate.
Mobility in Soil: Readily dissolves and disperses in groundwater; may move rapidly after large accidental release.
Bioaccumulative Potential: Generally assumed not to accumulate in living tissue.
Other Adverse Effects: Large spills may change local pH and interfere with plant uptake of nutrients.
Safe Disposal Method: Collect residues and contaminated containers, send for incineration or landfill at licensed chemical waste facility. Small volumes can be diluted greatly then poured to drain with copious amounts of water, checking with local sewer/disposal regulations.
Contaminated Packaging: Containers should be rinsed with water and disposed in accordance with federal, state, and local guidelines.
Precautions: Avoid uncontrolled environmental release to prevent local aquatic and soil disruptions.
UN Number: Not assigned as a hazardous material by major international road, sea or air regulations.
Proper Shipping Name: Sodium 4-Hydroxybenzene Sulfoate
Hazard Class: Not regulated for transport.
Packing Group: Not regulated for packing group.
Special Precautions: Protect all packaging from moisture and rough handling, clearly label according to chemical safety standards.
Transport Labels: Basic chemical name label; no special hazard label typically required.
Relevant Regulations: Not listed on US OSHA Hazardous Chemicals List. Not regulated as a toxic substance under TSCA or by the European REACH directive.
SARA Title III: Not specifically listed.
California Proposition 65: Not included as a known carcinogen or reproductive toxin.
Regulatory Status: Pure grades supplied for industrial or lab use fall under the general chemical safety framework; safety requirements depend on application and jurisdiction.
Workplace Safety: Employers must give proper training and access to this MSDS, ensure engineering controls, and provide personal protective equipment consistent with the identified hazards and risks above.
