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Product Name: Disodium Phosphate
Chemical Formula: Na2HPO4
Synonyms: Disodium hydrogen phosphate, Sodium phosphate dibasic
CAS Number: 7558-79-4
Recommended Uses: Water treatment, detergents, food additive, buffering agent, laboratory reagent
Supplier/Manufacturer: Name and address required from the packaging
Emergency Telephone: Refer to local labeling for available contact
GHS Classification: Not classified as hazardous under GHS
Routes of Entry: Inhalation, ingestion, skin and eye contact
Potential Health Effects: Exposure can cause coughing, mild respiratory irritation, minor skin or eye discomfort, and gastrointestinal distress if swallowed.
Chronic Effects: Extended or repeated exposure may irritate skin or eyes though evidence of long-term risks is limited
Signal Word: None required for non-hazardous classification
Pictograms: Not applicable
Precautionary Statements: Avoid excessive inhalation or ingestion, prevent contact with sensitive tissues, monitor symptoms with medical follow-up if irritation persists
Chemical Name: Disodium Hydrogen Phosphate
Common Name: Disodium Phosphate
CAS Number: 7558-79-4
Concentration: 98–100%
Impurities: Trace levels of sodium chloride, sodium sulfate, and sodium carbonate possible depending on manufacturer
Formula: Na2HPO4
Inhalation: Move affected person to fresh air; encourage slow, deep breaths; seek medical assessment if symptoms worsen
Skin Contact: Remove contaminated clothing; rinse skin thoroughly with water for a minimum of 15 minutes; medical attention advised if redness or discomfort persists
Eye Contact: Immediately flush with running water for at least 15 minutes; lift upper and lower eyelids occasionally; consult doctor if irritation continues
Ingestion: Rinse mouth thoroughly with water; do not induce vomiting unless advised by medical professional; contact poison control or health service
General Advice: Provide attending medical personnel with a copy of the MSDS or detailed product information
Flammability: Product is non-flammable
Suitable Extinguishing Media: Use water spray, carbon dioxide, dry chemical, or foam for surrounding fires
Hazardous Combustion Products: Emits sodium and phosphorus oxides at extremely high temperatures
Special Protective Equipment: Wear self-contained breathing apparatus and full protective gear in enclosed fires
Specific Hazards: Product does not burn or support combustion but containers exposed to fire may vent or rupture
Fire Fighting Methods: Isolate area, keep upwind, and limit entry if possible
Personal Precautions: Avoid breathing dust, prevent contact with eyes and skin, use appropriate protective clothing and equipment
Environmental Precautions: Prevent entry into sewers, drains, and waterways as this material may increase phosphate levels and promote algae growth in water bodies
Spill Clean-Up Methods: Collect spill with dry, clean shovel or vacuum, place in appropriate container for disposal; ventilate area; dust suppression may help with large spills
Disposal: Follow proper disposal mechanisms described in local regulations
Small Spills: Sweep or vacuum up and recycle if possible; cleanup residue with wet mopping to minimize dust formation
Handling: Use only in well-ventilated areas, avoid generating airborne dust, avoid breathing vapors or dusts, wear protective clothing as required by workplace assessment, keep containers tightly closed
Storage: Store in a cool, dry, well-ventilated place separate from strong acids, organics, and oxidizing agents; keep out of reach of children and unauthorized personnel
Incompatible Materials: Avoid contact with strong acids which can produce heat and toxic fumes
Packaging Materials: Suitable materials include plastic, glass, or lined steel drums to avoid corrosion or contamination
Occupational Exposure Limits: Not established by OSHA, NIOSH or ACGIH as of the latest update
Engineering Controls: Ensure local exhaust ventilation or general room ventilation minimizes airborne dust
Eye Protection: Use chemical safety goggles or face shield
Skin Protection: Wear gloves resistant to chemicals, aprons, and work boots as appropriate for handling bulk material
Respiratory Protection: Approved dust masks or respirators suggested if airborne dust becomes significant
Hygiene Measures: Wash hands before eating or drinking, remove contaminated clothing and launder before reuse, minimize exposure by keeping work areas clean
Appearance: White, crystalline powder or granules
Odor: Odorless
Melting Point: 250°C (482°F) (decomposes)
Boiling Point: Not applicable (decomposes before boiling)
Solubility: Soluble in water, forms alkaline solution
pH (1% solution): 8.9–9.4
Molecular Weight: 141.96 g/mol
Vapor Pressure: Not relevant for solids
Density: 1.53 g/cm3 at 20°C
Flash Point: Not flammable
Partition Coefficient: Not applicable
Viscosity: Not applicable
Chemical Stability: Stable under normal storage and operating conditions
Conditions to Avoid: Humidity, moisture, contamination with incompatible substances such as strong acids, excessive heat
Reactivity: Reacts with strong acids to form phosphoric acid and heat, may react with magnesium, aluminum, or zinc at elevated temperatures to release hydrogen
Hazardous Decomposition Products: Decomposition may produce sodium oxides and phosphorus oxides if exposed to extreme heat or flames
Polymerization: Does not polymerize
Acute Toxicity: Low toxicity; oral LD50 in rats exceeds 17,000 mg/kg
Chronic Toxicity: Prolonged exposure may slightly irritate mucous membranes, though data do not show significant systemic toxicity
Inhalation: High dust levels may irritate respiratory tract causing coughing and sneezing
Skin Contact: Prolonged exposure may cause dryness or mild irritation
Eye Contact: May lead to tearing, burning, or redness
Sensitization: No indication of skin sensitization reported in available studies
Carcinogenicity: No indication of carcinogenic potential according to major regulatory bodies (IARC, NTP, OSHA)
Mutagenicity: No evidence found in current testing
Reproductive Effects: Not identified as a reproductive hazard in available research
Ecotoxicity: Large releases may cause adverse environmental effects by contributing phosphate to water bodies, which can fuel algae blooms and lower aquatic oxygen
Persistence and Degradability: Inorganic salt does not degrade, presence in environment governed by water movement
Bioaccumulation Potential: Not expected to bioaccumulate
Mobility in Soil: Highly mobile in water, can migrate through soil to groundwater
Other Adverse Effects: Phosphate enrichment of water bodies (“eutrophication”) may cause significant changes to aquatic ecosystems
Disposal Methods: Handle in accordance with local, regional, and national requirements, typically as non-hazardous chemical waste
Waste from Residues: Small quantities may be diluted and flushed with plenty of water unless restricted by local discharge regulations
Packaging Disposal: Thoroughly clean and recycle or dispose of containers according to approved methods
Contaminated Material: Treat as non-hazardous chemical waste unless contamination poses additional hazards
UN Number: Not classified as hazardous for transport
UN Proper Shipping Name: Disodium Phosphate
Transport Hazard Class: Not dangerous according to ADR, IMDG, IATA
Packing Group: Not applicable
Environmental Hazards: Not a marine pollutant under current definitions
Transport Precautions: Use standard packaging to prevent spillage or dust, secure containers to avoid shifting during transit
TSCA Status: Listed on US Toxic Substances Control Act inventory
EU Registration: Listed under REACH (EC 1907/2006)
OSHA: Not specifically regulated as hazardous
WHMIS (Canada): Not controlled
California Proposition 65: Disodium phosphate not listed as a carcinogen or reproductive toxicant
Other Regulations: Food-use grades subject to additional food safety regulations by FDA, EFSA, and similar authorities
Labeling Requirements: Follow local workplace safety and chemical labeling rules, even though product often carries no special hazard symbols
