© 2026 Nanjing Finechem Holdings Co., Ltd,
All Right Reserved
Product Name: Sodium Phosphate Dibasic Dodecahydrate
Chemical Formula: Na2HPO4·12H2O
Synonyms: Disodium hydrogen phosphate dodecahydrate, Disodium phosphate, Dibasic sodium phosphate
CAS Number: 10039-32-4
Recommended Use: Used in laboratories, water treatment, textile processing, food additives, and buffer solutions
Manufacturer: Commonly supplied by major laboratory chemical brands; check label for details
Emergency Phone Number: Poison control and local emergency services contact available on product label
Hazard Classification: Not considered hazardous under normal handling; mild irritant
Health Hazards: May cause irritation to eyes, skin, and respiratory tract; ingestion can lead to gastrointestinal upset
Environmental Hazards: May contribute to nutrient pollution in water; can promote algal blooms
Signal Word: Not required for non-hazardous chemicals, but caution needed
Pictograms: No GHS required; basic eye/hand protection suggested
Precautionary Statements: Avoid inhaling dust, contact with skin and eyes; keep away from food and drink
Emergency Overview: White or colorless crystals; no significant odor; avoid creating and breathing dust
Chemical Identity: Sodium Phosphate Dibasic Dodecahydrate
Purity: Usually over 98%
Component: Na2HPO4·12H2O
Impurities: May have trace sodium chloride, sodium sulfate, or orthophosphate
Concentration: 100% sodium phosphate dibasic dodecahydrate by weight for typical lab grades
Inhalation: Move to fresh air, seek medical attention if symptoms persist like coughing, shortness of breath
Skin Contact: Remove contaminated clothing, rinse affected area with water and mild soap, seek care for persistent irritation
Eye Contact: Immediately flush eyes with plenty of water for at least 15 minutes, lift eyelids occasionally, seek medical attention
Ingestion: Rinse mouth with water, consume water to dilute, do not induce vomiting, get medical advice if feeling unwell
Symptoms of Exposure: Burning sensation, coughing, redness of skin or eyes, nausea, stomach discomfort
Suitable Extinguishing Media: Water spray, dry chemical, foam, carbon dioxide
Fire Hazards: Product not flammable; does not support combustion
Protective Equipment: Firefighters should wear full protective gear and self-contained breathing apparatus
Hazardous Combustion Byproducts: Clouds of sodium oxides and phosphorous oxides if exposed to intense heat
Special Procedures: Cool containers exposed to fire with water mist; avoid inhaling decomposition products
Explosion Potential: No known explosive properties, avoid rough handling to prevent spills
Spill Procedures: Sweep up spilled powder, minimize dust creation, collect in sealed containers
Personal Precautions: Wear gloves, goggles, and dust mask; keep unprotected people away
Environmental Precautions: Prevent release to waterways and storm drains; avoid runoff into soil
Cleanup Methods: Use wet methods to reduce dust; ventilate area during cleanup
Waste Disposal: Dispose of according to local regulations; collect residue and contaminated materials for proper handling
Handling: Handle in well-ventilated place; wear protective equipment to avoid contact with eyes/skin
Technical Measures: Use exhaust hood or local ventilation; avoid creating airborne dust
Storage Conditions: Store in tightly closed containers; keep in a cool, dry, well-ventilated place
Incompatible Materials: Keep away from acids, strong oxidizers; may form hazardous gases with acidic contact
Safe Packaging Materials: Use polyethylene or glass containers; clearly label all storage vessels
Specific End Uses: Laboratory buffering, water conditioning, cleaning, food additive (verify grade)
Exposure Limits: No official OSHA or ACGIH exposure limits for sodium phosphate dibasic dodecahydrate
Engineering Controls: Local exhaust ventilation recommended, especially during weighing or transfer
Personal Protective Equipment: Chemical-resistant gloves, safety goggles, lab coat
Respiratory Protection: Dust mask or respirator if airborne dust is possible
Hygiene Practices: Wash hands after handling; remove contaminated clothing and wash before reuse; do not eat, drink, or smoke in handling areas
Environmental Controls: Prevent uncontrolled releases to drains or nature; use secondary containment if possible
Appearance: White crystalline powder
Odor: Odorless
Molecular Weight: 358.14 g/mol
Melting Point: Decomposes on heating; water loss begins at about 35°C, melts around 100°C
Boiling Point: Not applicable (decomposes before boiling)
Solubility: Dissolves well in water (>10g/100mL at 25°C)
pH (1% solution): 9.1 (alkaline)
Vapor Pressure: Not significant at room temperature
Density: About 1.52 g/cm3 at 20°C
Evaporation Rate: Not applicable
Other Properties: Stable in dry air, effloresces (releases water) in warm air
Chemical Stability: Stable under normal storage and use conditions
Reactivity: Inert with most materials; avoid strong acids
Hazardous Reactions: Acids generate toxic phosphoric acid fumes
Incompatible Materials: Acids, strong oxidizers, ammonium compounds
Decomposition Products: Sodium oxide, phosphorous oxides, water vapor
Polymerization: Does not occur
Likely Routes of Exposure: Inhalation, skin and eye contact, ingestion
Acute Toxicity: LD50 (Oral, Rat): about 17,000 mg/kg (low toxicity)
Skin Effects: May cause dryness or mild irritation
Eye Effects: May cause redness, watering, burning sensation
Chronic Effects: No known significant long-term effects; prolonged exposure may increase risk of irritation
Sensitization: Not known to produce allergic reactions
Mutagenicity / Carcinogenicity: Not classified as mutagenic, carcinogenic, or reproductive toxin
Other Information: No evidence of significant human health effects from normal laboratory or industrial exposure
Environmental Impact: Contributes to phosphate pollution in water; can promote undesirable algae growth
Aquatic Toxicity: Not highly toxic to aquatic life but supports nutrient pollution effects
Persistence and Degradability: Persistent as inorganic salt, remains until diluted or incorporated into biological cycles
Bioaccumulation: Phosphates do not bioaccumulate in organisms
Mobility in Soil: Mobile in water; can easily migrate through soils into surface and groundwater
Other Harmful Effects: Encourages eutrophication in lakes, rivers, ponds
Disposal Methods: Dispose of material in accordance with local, regional, and national regulations
Waste Classification: Non-hazardous under US RCRA; verify status locally
Disposal Precautions: Prevent entry into surface water bodies and sewage
Packaging Disposal: Clean and recycle or dispose of packaging responsibly
Other Recommendations: Consider treatment to remove phosphates from waste streams before environmental release
UN Number: Not regulated as a hazardous material for transport
Proper Shipping Name: Sodium phosphate dibasic dodecahydrate
Hazard Class: Not applicable
Packing Group: Not applicable
Label: Standard labeling for laboratory chemicals
Special Transport Precautions: Store in secure, upright containers to prevent spillage during transit
International Transport: Not classified as dangerous for IATA, IMDG, ADR
US Regulations: Not listed as hazardous by OSHA, TSCA inventory compliant
EU Regulations: Not classified as hazardous under CLP/GHS
Canada: Listed on DSL; not a controlled product under WHMIS
International Inventories: Found on US TSCA, EINECS/ELINCS, DSL/NDSL inventories
SARA Title III: Not subject to reporting requirements
California Proposition 65: Substance not listed
Other Information: Some local governments restrict phosphates in consumer products due to eutrophication; check your local ordinances for specifics.
