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Product Name: Disodium Hydrogen Phosphate
Chemical Formula: Na2HPO4
CAS Number: 7558-79-4
Synonyms: Disodium Phosphate; Sodium Phosphate Dibasic
Recommended Use: Buffering agent, food additive, laboratory reagent, water softener
Manufacturer: Supplier and contact information varies with distributor; always check the packaging or Safety Data Sheet.
Emergency Contact: Refer to local, regional, or international emergency numbers; Poison Control Center available for most locations
Product Code: Typically listed by the supplier or manufacturer for inventory tracking
Relevant Identified Uses: Used in technical and industrial processes, laboratories, pool maintenance, and sometimes pharmaceutically as a pH adjuster.
GHS Classification: Not classified as hazardous under GHS guidance
Label Elements: No specific hazard pictograms required
Signal Word: None required
Hazard Statements: Not considered hazardous under normal conditions of use
Precautionary Statements: Avoid prolonged contact with skin and eyes, avoid inhalation of dust
Routes of Exposure: Inhalation, skin contact, eye contact, ingestion
Symptoms: May cause mild irritation to eyes and skin; inhalation can result in coughing or shortness of breath if exposure is excessive; ingestion of significant amounts can result in gastrointestinal disturbances
Ingredient Name: Disodium Hydrogen Phosphate
Chemical Formula: Na2HPO4
Purity: Typically >98% for industrial and laboratory grade
Other Constituents: May contain small quantities of water if presented as the dihydrate or heptahydrate forms
Impurities: Trace metallic elements may be present depending on the source and grade; information usually supplied by the manufacturer
Skin Contact: Rinse affected area with plenty of water and remove contaminated clothing; wash thoroughly with soap and water. Seek attention if irritation persists.
Eye Contact: Rinse immediately with water for at least 15 minutes, lifting eyelids occasionally. Remove contact lenses if present and easy to do. Medical attention suggested if discomfort continues.
Inhalation: Move the person outdoors to fresh air; seek medical attention if symptoms like coughing or sore throat develop and persist.
Ingestion: Rinse mouth with water. Do not induce vomiting. Give water to drink if conscious. Seek medical advice for persistent symptoms.
Notes for Doctors: Treat symptomatically based on individual reaction and clinical condition.
Suitable Extinguishing Media: Use water spray, foam, dry chemical, or carbon dioxide for surrounding fire
Specific Hazards: Not flammable; can release toxic fumes such as sodium oxides and phosphorus oxides if significantly heated beyond decomposition
Protective Equipment for Firefighters: Wear self-contained breathing apparatus (SCBA) and full protective gear
Special Firefighting Procedures: Consider evacuation for surrounding areas if significant quantities become involved; use water spray to cool unopened containers; avoid inhaling fumes
Personal Precautions: Use personal protective equipment; avoid formation of dust; evacuate unnecessary personnel from the area
Environmental Precautions: Prevent entry to sewers, drains, and waterways
Methods for Containment and Cleaning Up: Sweep or vacuum up material without generating dust; place in suitable containers for disposal; ventilate area
Disposal: Collect residues for disposal according to local, regional, or national regulations
Handling: Keep containers closed when not in use; handle in well-ventilated areas; avoid ingestion, inhalation, or contact with skin and eyes
Storage: Store in cool, dry, well-ventilated areas; keep away from food, beverages, and incompatible substances such as strong acids
Incompatible Materials: Reacts with strong acids to produce phosphoric acid; avoid storage with oxidizing agents
Packaging: Use moisture-tight packaging; clearly label containers to avoid mix-ups
Special Precautions: Avoid build-up of dust; keep product away from children and unauthorized users
Exposure Limits: Not specifically regulated for occupational exposure; observe general dust limits (e.g., OSHA PEL for nuisance dusts: 15 mg/m3 total)
Engineering Controls: Use local exhaust ventilation or general room ventilation to limit dust
Personal Protection: Wear chemical-resistant gloves (nitrile or latex recommended), safety goggles, protective clothing
Respiratory Protection: Use particulate respirators (N95 or better) if dust exposure risk exists
Hygiene Measures: Wash hands thoroughly after handling; remove contaminated clothing and launder before reuse
Appearance: White crystalline powder or granules
Odor: Odorless
Molecular Weight: 141.96 g/mol (anhydrous); varies with hydration
Melting Point: 250°C (decomposes)
Solubility in Water: Highly soluble
pH (1% Solution): Ranges from 8.8 to 9.5
Boiling Point: Not applicable (decomposes before boiling)
Density: About 1.52 g/cm3 (anhydrous)
Vapor Pressure: Not applicable
Partition Coefficient (n-octanol/water): Not determined
Evaporation Rate: Not applicable
Chemical Stability: Stable under normal conditions of storage and handling
Conditions to Avoid: High temperatures, moisture, and contact with incompatible materials
Materials to Avoid: Avoid strong acids, strong oxidizers
Hazardous Reactions: Reacts with acids to produce irritating phosphoric acid fumes
Hazardous Decomposition Products: Decomposes on strong heating to form sodium oxides and phosphorus oxides
Acute Toxicity: Oral LD50 (rat) estimated at >17,000 mg/kg; considered nontoxic in small quantities
Routes of Exposure: Ingestion, inhalation, skin and eye contact
Skin Irritation: May cause mild irritation after prolonged or repeated exposure
Eye Irritation: Dust may irritate eyes
Respiratory Irritation: Dust can cause coughing or sneezing
Chronic Effects: No chronic toxicity reported in typical exposures
Carcinogenicity, Mutagenicity, Reproductive Toxicity: No evidence of carcinogenic, mutagenic, or reproductive effects in available data
Symptoms of Overexposure: Nausea, vomiting, diarrhea if large amounts ingested
Aquatic Toxicity: Not expected to be hazardous in water at normal concentrations; high concentrations could disrupt aquatic ecosystems by contributing to nutrient loading (eutrophication)
Persistence and Degradability: Phosphate salts persist in the environment, though they convert to naturally-occurring forms
Bioaccumulation: Does not bioaccumulate in organisms
Mobility in Soil: Very mobile in water; can migrate into ground and surface waters
Other Adverse Effects: Contributes to phosphate pollution associated with algal blooms in some situations
Waste Disposal: Dispose of according to local, national, and international regulations; landfill is common option for non-hazardous chemicals
Packaging Disposal: Contaminated packaging should be treated as product waste; thoroughly rinse and recycle if possible; dispose in accordance with regulations
Precautions: Avoid disposing large quantities into drains or water bodies to prevent nutrient pollution
Regulatory Information: Waste not classified as hazardous under most regulatory schemes; still, handle with care to prevent unintended environmental release
UN Number: Not regulated as dangerous goods for transport
UN Proper Shipping Name: Not applicable
Transport Hazard Class: Not applicable
Packing Group: Not assigned
Special Precautions for User: Keep container tightly closed and dry; avoid cargo shifting that might damage packaging
Transport Labels: No special labeling required under most transport provisions
OSHA Status: Not classified as hazardous
SARA Title III Sections 302/304, 311/312, 313: Not listed
TSCA Listing: Listed
REACH Registration Number: Available from supplier for European users
Other International Inventories: Listed in major chemical inventories globally
Labeling According to EC Directives: No symbol required; precaution phrases suggest avoiding contact with eyes and skin
Other Regulations: Use and disposal subject to regional water, waste, and safety laws focused on phosphate management and worker safety
