Sodium Persulfate, Sodium Peroxydisulfate, 7775-27-1

Sodium Persulfate, Sodium Peroxydisulfate, 7775-27-1

Overview

• Sodium persulfate (Na₂S₂O₈) is a strong oxidizing agent, usually found as a white crystalline powder, soluble in water.

• It is stable under standard conditions but decomposes when heated.

• CAS Number: 7775-27-1

• PubChem CID: 24435

Physical & Chemical Properties

• Molecular Weight: 238.10 g/mol

• Density: 2.4–2.6 g/cm³

• Melting Point: 100–180 °C (decomposes rather than melts cleanly)

• Solubility: 55.6 g/100 mL at 20 °C

• Odor/Taste: Odorless, tasteless

Production

• Typically manufactured via electrolytic oxidation of sodium sulfate, producing persulfate ions that crystallize into the solid salt.

Applications

• Polymerization: Radical initiator in emulsion polymerization (e.g., ABS, PAN).

• Electronics: Cleaning and preparation of printed circuit boards.

• Textiles & Cosmetics: Bleaching and oxidizing agent.

• Detergents: Stain remover, color stabilizer.

• Environmental remediation: Oxidizes pollutants such as BTEX, chlorinated ethenes, and trichloroethane.

• Battery technology: Used as a depolarizer.

Safety & Risks

• Hazards: Strong oxidizer, irritant to skin, eyes, and respiratory tract.

• Reactivity: Dangerous with flammable materials, reducing agents, and alcohols.

• Fire risk: Decomposes at high temperatures, releasing toxic gases.

• Storage: Keep in tightly sealed containers, well-ventilated areas, away from incompatible substances.

Safety Measures

• Use PPE: gloves, goggles, dust mask.

• Ensure good ventilation.

• First aid:

  • Skin contact → rinse with plenty of water.

  • Eye contact → flush with water for 15 minutes, seek medical help.

  • Inhalation → move to fresh air, seek medical help if needed.

Documentation & Quality Control

• COA (Certificate of Analysis): Confirms purity and physical/chemical properties.

• Batch Number: Ensures traceability.

• Product Number: Used for ordering and inventory management.

Comparisons

• Sodium sulfate (Na₂SO₄): Inert, used as filler in detergents.

• Ammonium persulfate ((NH₄)₂S₂O₈): Similar oxidizer, different solubility and stability.

• Potassium persulfate (K₂S₂O₈): Similar function, but with different solubility characteristics.

✅ In short: Sodium persulfate is a versatile, powerful oxidizer widely used in polymer chemistry, electronics, textiles, detergents, and environmental cleanup. It requires strict safety measures due to its reactivity and irritant properties.