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LABORATORY GRADE

Sodium Thiosulphate Pentahydrate Extra Pure

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Sodium Thiosulphate Pentahydrate Extra Pure is a white, crystalline, odorless compound widely used in laboratories and industry as a reducing agent, titrant, and water dechlorination chemical. It plays a vital role in photographic fixing, water treatment, and pharmaceutical antidotes for cyanide poisoning. This Extra Pure grade ensures high quality and reliability for analytical, pharmaceutical, and industrial applications. It must be stored in a dry, cool environment away from acids and oxidizers and handled with appropriate personal protective equipment to avoid irritation.

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Description

Sodium Thiosulphate Pentahydrate Extra Pure

PRIMARY USES

Analytical Reagent & Laboratory Applications:
 • Commonly used as a titrant in iodometry and other redox titrations
 • Acts as a reducing agent in various chemical reactions
 • Used to neutralize chlorine in water treatment and laboratory procedures

Photography:
 • Utilized as a fixer in photographic processing to dissolve unexposed silver halides

Water Treatment:
 • Used to dechlorinate water and remove excess halogens
 • Helps neutralize chlorine and bromine residues in swimming pools and industrial water systems

Pharmaceutical Industry:
 • Used as an antidote for cyanide poisoning in combination with other agents
 • Acts as a sulfur donor in medical treatments

SECONDARY USES

Textile Industry:
 • Employed in dyeing and bleaching processes to reduce color impurities

Paper Industry:
 • Used in pulping and bleaching to improve paper quality

Environmental Applications:
 • Used in wastewater treatment to remove heavy metals and disinfectants

PRODUCT KEY FEATURES
  1. Basic Identification Attributes
     • Chemical Name: Sodium Thiosulphate Pentahydrate
    • CAS Number: 10102-17-7
    • HS Code: 2832.30.00
    • Molecular Formula: Na₂S₂O₃·5H₂O
    • Synonyms:

  • Sodium hyposulfite pentahydrate
  • Hypo (photography)
  1. Physical & Chemical Properties
     Physical State: Crystalline solid, pentahydrate
    • Color & Odor: White, odorless
    • Melting Point: 48 °C (loses water of crystallization)
    • Boiling Point: Decomposes upon heating
    • Density: Approximately 1.7 g/cm³
    • Solubility:

  • Highly soluble in water
  • Insoluble in ethanol
    • pH Level: Slightly alkaline (~9 for 0.1 M solution)
    • Vapor Pressure: Negligible
    • Flash Point: Not flammable
  1. Safety & Hazard Attributes
     Hazard Class (GHS Classification):

  • Generally considered low hazard; may cause mild skin or eye irritation
    • NFPA Ratings:

  • Health: 1
  • Flammability: 0
  • Reactivity: 0
    • Exposure Limits:

  • No specific OSHA PEL or ACGIH TLV established
    • Reactivity:

  • Stable under normal conditions
  • Avoid contact with strong oxidizers
  1. Storage & Handling Attributes
     Storage Conditions:

  • Store in a cool, dry, well-ventilated area
  • Keep container tightly closed
    • Incompatible Materials:

  • Strong acids and oxidizers
    • Container Type:

  • Plastic or glass containers recommended
    • Shelf Life:

  • Stable for several years if stored properly
    • Special Handling Requirements:

  • Use gloves and eye protection
  • Avoid inhalation of dust
  1. Regulatory & Compliance Attributes
     Regulatory Status:

  • Approved for pharmaceutical and laboratory use (USP)
  • Listed under REACH, OSHA, and EPA inventories
    • Transportation Restrictions:

  • Not classified as hazardous for transport
    • Waste Disposal Method:

  • Dispose in accordance with local environmental regulations
  1. Environmental & Health Impact
     Ecotoxicity:

  • Low toxicity to aquatic life
    • Persistence in Environment:

  • Biodegradable and readily breaks down in water
    • Carcinogenicity/Mutagenicity:

  • Not classified as carcinogenic or mutagenic
    • Biodegradability:

  • Readily biodegradable
SAFETY HANDLING PRECAUTIONS

SAFETY PRECAUTIONS

Personal Protective Equipment (PPE):
 • Wear chemical-resistant gloves
 • Use safety goggles or face shield
 • Wear protective clothing
 • Use dust mask if handling powder form

Handling:
 • Handle in well-ventilated area
 • Avoid contact with skin and eyes
 • Do not breathe dust
 • Wash hands after handling

Storage:
 • Store in tightly sealed container
 • Keep away from moisture, acids, and oxidizers

FIRST AID MEASURES

Inhalation:
 • Move to fresh air immediately
 • Seek medical attention if irritation develops

Skin Contact:
 • Wash skin with soap and water
 • Remove contaminated clothing
 • Seek medical advice if irritation occurs

Eye Contact:
 • Rinse eyes thoroughly with water for at least 15 minutes
 • Seek medical attention if irritation persists

Ingestion:
 • Rinse mouth with water
 • Seek medical advice if symptoms appear

FIRE FIGHTING MEASURES

Flammability:
 • Non-flammable

Extinguishing Media:
 • Use water spray, foam, dry chemical, or CO₂ extinguisher

Hazardous Combustion Products:
 • May release sulfur oxides when heated to decomposition

Firefighter Protection:
 • Wear full protective gear and self-contained breathing apparatus (SCBA)

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