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Chemical name: Sodium persulfate
Synonyms: Disodium peroxodisulfate
Common use: Etchant in electronics, polymerization initiator, oxidizer for cleaning
Form: White, crystalline solid
Odor: Odorless
Chemical formula: Na2S2O8
Molecular weight: 238.11 g/mol
GHS classification: Oxidizing solid, category 3; skin irritant, category 2; eye irritant, category 2A; respiratory sensitizer, category 1
Hazard symbols: Exclamation mark, oxidizer symbol
Main hazards: Strong oxidizer, can intensify fire, can irritate respiratory system, skin, and eyes; may trigger allergic reactions if inhaled
Acute effects: Sneezing, coughing, eye redness, skin inflammation
Chronic exposure risks: Long-term respiratory sensitivity, dermatitis
Sodium persulfate: 97% or higher
Inert material: Up to 3%
Impurities: Trace (usually sulfates or moisture)
Inhalation: Remove person to fresh air, seek medical attention if irritation persists, monitor for breathing difficulty
Skin contact: Remove contaminated clothing, wash exposed skin thoroughly with plenty of water and soap
Eye contact: Rinse eyes carefully for several minutes, lift eyelids occasionally, seek medical attention for continued redness or pain
Ingestion: Rinse mouth, do not induce vomiting, seek medical attention if feeling unwell
Suitable extinguishing media: Use water spray, dry chemical, or CO2; avoid using dry combustibles to put out fire
Hazardous combustion products: Sulfur oxides (SOx), sodium oxides
Unusual hazards: Substance will speed up combustion, may explode if mixed with combustible materials; avoid contact with flammables
Protective equipment: Use self-contained breathing apparatus and fully protective gear
Precautions: Evacuate area, ensure good ventilation, prevent contact with combustibles
Personal protection: Gloves, goggles, NIOSH-approved respirator
Cleanup: Collect spilled product with non-combustible materials, avoid raising dust, place in suitable containers, wash area with water
Handling: Minimize dust generation, avoid breathing dust, wash hands after use, do not eat or drink while handling
Storage: Store in tightly closed containers, keep away from moisture, food, combustibles, and reducing agents, protect from heat
Occupational exposure limits: ACGIH TLV: 0.1 mg/m3 (respirable fraction)
Engineering controls: Use local ventilation, dust extraction systems
Protective equipment: Chemical-resistant gloves, safety goggles, long-sleeved clothing, NIOSH-approved dust respirator
Hygiene measures: Wash hands before eating and after handling, avoid ingesting or inhaling dust
Appearance: White crystalline powder
Melting point: Decomposes above 180°C
Solubility: Soluble in water
Boiling point: Not applicable (decomposes before boiling)
Odor threshold: Not detectable
pH of solution: 2–3 (50 g/L at 20°C)
Vapor pressure: Not significant
Density: About 2.6 g/cm³
Stability: Stable under dry, cool storage; decomposes in presence of moisture or heat
Hazardous reactions: Vigorous reaction with reducing agents, organic materials, acids, and combustibles
Incompatible materials: Strong acids, alkalis, combustible materials, reducing agents, metals like aluminum
Decomposition products: Oxygen, sulfur oxides, sodium oxides
Routes of exposure: Inhalation, skin contact, eye contact, ingestion
Acute toxicity: May cause irritation or allergic reaction to respiratory tract, skin and eyes
Skin and eye irritation: Redness, pain, inflammation
Respiratory effects: Potential for allergic asthma and coughing
Long-term effects: Extended exposure increases risk of skin sensitization, respiratory sensitivity
Aquatic toxicity: Harmful in large quantities to aquatic organisms
Persistence and degradability: Converts into sulfate ions in water, expected to degrade relatively quickly
Bioaccumulation: Unlikely to bioaccumulate in living organisms
Water hazard: Avoid disposal in waterways to prevent short-term harm to aquatic life
Waste handling: Dispose as hazardous chemical waste
Neutralization: Dissolve in water, reduce with ferrous salt before disposal if permitted
Regulatory disposal: Follow local, state, and federal regulations for strong oxidizers
UN number: 1505
Hazard class: 5.1 (oxidizing substance)
Packing group: III
Special precautions: Separate from combustibles and organic materials during shipping
Labeling: Clearly mark packages as oxidizer, follow transport authority guidelines
Labelling requirements: GHS classification and signal words required on packaging
Reporting requirements: Include in workplace chemical inventories where required
Employee training: Workers should receive proper training on handling oxidizers, maintain safety protocols and emergency procedures
