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Substance Name: Sodium Pyrophosphate
Chemical Formula: Na4P2O7
Synonyms: Tetrasodium pyrophosphate, Disodium dihydrogen pyrophosphate, TSPP
CAS Number: 7722-88-5
Recommended Uses: Water softening, detergent additive, dispersing agent, food additive
Supplier Contact: Name, address, phone number, email of supplier or manufacturer
Emergency Phone Number: 24-hour emergency contact for spill, exposure, or poisoning incidents
GHS Classification: Skin irritation (Category 2), Eye irritation (Category 2A)
Signal Word: Warning
Hazard Statements: Causes skin irritation, causes serious eye irritation
Pictograms: Exclamation mark (for irritants)
Precautionary Statements: Avoid breathing dust, wash hands thoroughly after handling, wear protective gloves and eye protection, if contact with eyes: rinse cautiously with water, remove contact lenses if present and easy to do — continue rinsing
Other Hazards: High dust concentrations can cause respiratory irritation; ingestion may upset stomach; repeated exposure may worsen symptoms
Chemical Name: Tetrasodium pyrophosphate
CAS Number: 7722-88-5
Weight Percentage: 98%–100%
Impurities: Trace sodium orthophosphate, sodium carbonate
Other Components: No hazardous ingredients present in concentrations that require disclosure
Inhalation: Move person to fresh air, keep comfortable for breathing, seek medical advice if symptoms persist
Skin Contact: Remove contaminated clothing, rinse skin with plenty of water, use soap if available, get medical attention if skin irritation develops
Eye Contact: Rinse cautiously with water for several minutes, remove lenses, continue rinsing until irritation subsides, seek medical help if redness or pain remains
Ingestion: Rinse mouth, drink plenty of water, seek medical attention if ill effects develop, do not induce vomiting unless directed by medical personnel
Most important symptoms: Redness, burning, stinging, possible allergic reactions in sensitive individuals
Onset of effects: Minutes to hours after exposure depending on level and route
Suitable Extinguishing Media: Water spray, foam, dry chemical powder, carbon dioxide
Unsuitable Media: Avoid using water jet if large spill forms dust clouds
Specific Hazards: Sodium pyrophosphate does not burn, but heating may release toxic or irritating phosphorus oxides
Protective Equipment: Firefighters require self-contained breathing apparatus and protective clothing
Advice for fire scene: Evacuate area, contain runoff, ventilate area after fire is out
Combustion By-products: Sodium oxides, phosphorus oxides (may be released from extreme heat)
Personal Precautions: Wear suitable protective equipment, avoid creating airborne dust, keep unprotected people away
Environmental Precautions: Prevent entry into drains, soil, or water bodies; large spills may have aquatic toxicity
Spill Clean-up Methods: Sweep or vacuum dust into sealable containers, avoid dry sweeping if possible, use damp methods or HEPA filter vacuums
Waste Handling: Place collected material in suitable container for disposal according to local laws
Decontamination: Rinse residue with water, ventilate area thoroughly
Safe Handling: Use in well-ventilated area, minimize dust generation, wear personal protective equipment, keep containers tightly closed when not in use, always wash hands after handling
Storage Conditions: Store in a cool, dry place away from acids and moisture, keep away from incompatible materials such as strong oxidizers and reducing agents
Incompatible Materials: Avoid contact with acids (produces heat), strong oxidizers
Bulk Storage: Use corrosion-resistant tanks and bins; monitor for leaks
Hygiene Practices: No eating, drinking, or smoking in handling area, keep separate from food products
Occupational Exposure Limits: None established for sodium pyrophosphate; consider using general dust exposure limits (e.g., ACGIH TLV for nuisance dust: 10 mg/m3 (total), 3 mg/m3 (respirable))
Engineering Controls: Local exhaust ventilation, process enclosure, dust collection systems
Personal Protective Equipment:
Hand protection: Impervious gloves (nitrile, PVC)
Eye protection: Chemical safety goggles
Respiratory protection: Approved dust mask or respirator if exposure limits exceeded or significant dust present
Skin/body protection: Long sleeves, lab coat, closed footwear
Workplace Monitoring: Regular air sampling if dust generation is likely
Appearance: White crystalline or granular powder
Odor: Odorless
Odor Threshold: Not relevant
pH: Approx. 9.9 (1% solution in water)
Melting Point/Range: 988°C (decomposes)
Boiling Point/Range: Not applicable (decomposes)
Flash Point: Not flammable
Evaporation Rate: Negligible
Flammability: Non-flammable
Explosive Properties: Not explosive
Vapor Pressure: Not applicable
Vapor Density: Not applicable
Density/Bulk Density: 2.534 g/cm3
Solubility: Moderately soluble in water (6g/100ml at 25°C)
Partition Coefficient (n-octanol/water): Not available
Decomposition Temperature: Above 988°C
Viscosity: Not applicable
Reactivity: Reacts with acids, generation of heat and phosphoric acid possible
Chemical Stability: Stable under normal storage and use conditions
Possible Hazardous Reactions: Contact with strong acids releases phosphoric acid; with strong oxidizers, can increase fire hazard
Conditions to Avoid: Moisture, high humidity, extreme heat
Incompatible Materials: Acids, strong oxidizers, some metals in moist environments (may cause corrosion)
Hazardous Decomposition Products: Sodium and phosphorus oxides as decomposition gases
Routes of Exposure: Inhalation, skin and eye contact, ingestion
Acute Toxicity: LD50 (oral, rat) ~ 7100 mg/kg
Skin Contact: May cause irritation, dryness, redness
Eye Contact: Severe irritation, redness, watering, possible corneal injury
Inhalation: Irritation of nose, throat and upper airways, coughing
Ingestion: Upset stomach, nausea, diarrhea at high amounts
Chronic Effects: Prolonged exposure to dust may aggravate lung conditions; no reliable evidence of mutagenicity, carcinogenicity, or reproductive hazards
Sensitization: Not expected in most people, rare allergic skin reactions possible
Aquatic Toxicity: Harmful to aquatic organisms at high concentrations; Large spills may cause phosphate pollution, leading to eutrophication
Mobility: Highly soluble in water, can migrate in groundwater
Persistence and Degradability: Inorganic, not readily biodegradable; phosphates can persist in the environment
Bioaccumulation: Not expected; does not accumulate in aquatic life
Other Adverse Effects: Excess phosphates accelerate algal bloom in water bodies, depleting oxygen and affecting aquatic life
Waste Disposal: Dispose of in accordance with local, regional, and national regulations; avoid disposal in drains, sewers, or natural waterways
Container Disposal: Triple-rinse containers, recycle or dispose as hazardous waste if contaminated
Recommended Methods: Landfill at approved site after neutralization if appropriate, consult local authorities about phosphate limitations
Special Precautions for Landfill: Prevent leaching into groundwater
UN Number: Not classified as hazardous under UN transport regulations
UN Proper Shipping Name: Sodium pyrophosphate
Transport Hazard Class: Not regulated as dangerous goods
Packing Group: Not applicable
Environmental Hazards: No special labeling needed for transport, but avoid large releases into water bodies
Precautions for Transport: Keep containers closed and dry, prevent tearing or puncturing during transit
OSHA Status: Not specifically listed as hazardous by OSHA Standard 29 CFR 1910
TSCA Inventory: Listed
SARA 313 Reporting: Not subject to reporting requirements
EPA Regulations: Phosphates regulated for water pollution control
EU REACH: Registered substance; no restrictions for industrial use
WHMIS Classification (Canada): D2B (skin/eye irritant)
Food Additive Regulations: Permitted under certain concentrations and uses, see national food safety codes
Other Regulatory Info: Keep up-to-date with regional and international safety regulations as they evolve
West Ujimqin Banner, Xilingol League, Inner Mongolia, China
