© 2026 Nanjing Finechem Holdings Co., Ltd,
All Right Reserved
Product Name: Sodium Phosphate Monobasic
Synonyms: Monosodium dihydrogen phosphate, Sodium dihydrogen phosphate
Chemical Formula: NaH2PO4
CAS Number: 7558-80-7
Recommended Use: Laboratory reagent, water treatment, food additive, buffer agent
Supplier: Chemical manufacturers, laboratory supply companies
Contact Information: Emergency phone numbers often provided by supplier or local poison center
GHS Classification: Eye irritation, Category 2A
Signal Word: Warning
Hazard Statements: Causes serious eye irritation. Prolonged contact may cause mild skin irritation. Inhalation of dust may result in respiratory irritation.
Precautionary Statements: Wear eye protection, avoid breathing dust, wash hands thoroughly after use, avoid contact with skin and eyes.
Other Hazards: Not flammable, not explosive, reacts with strong acids forming phosphoric acid and sodium salts
Chemical Name: Sodium dihydrogen phosphate
CAS Number: 7558-80-7
Weight %: 100% pure or as indicated by supplier
Impurities: Trace levels of heavy metal salts may be present depending on production method
Additives: None typically added in laboratory or industrial supply
Eye Contact: Rinse with plenty of water for at least fifteen minutes, lift eyelids, seek medical attention if irritation persists.
Skin Contact: Wash thoroughly with soap and water, seek medical attention for persistent redness or irritation.
Inhalation: Move to fresh air, keep warm and at rest, seek medical attention if symptoms develop.
Ingestion: Rinse mouth, drink plenty of water, never give anything by mouth to an unconscious person, seek medical advice if large amounts are swallowed or if discomfort develops.
Notes for Physicians: Treat symptomatically, no specific antidote known
Suitable Extinguishing Media: Use media appropriate for surrounding fire such as water spray, foam, dry powder, or carbon dioxide.
Unsuitable Extinguishing Media: No known unsuitable extinguishing agents.
Specific Hazards: Product is not combustible. Thermal decomposition releases irritating or toxic fumes, notably oxides of sodium and phosphorus.
Protective Equipment & Precautions: Firefighters should wear self-contained breathing apparatus and full protective clothing. Keep containers cool with water spray to prevent bursting.
Special Procedures: Prevent runoff from entering drains or waterways, as phosphates can lead to environmental issues such as eutrophication.
Personal Precautions: Wear suitable personal protective equipment like gloves, chemical splash goggles, and dust mask. Avoid creating dust.
Environmental Precautions: Do not allow large quantities to enter sewer or water systems.
Spill Cleanup Methods: Sweep or scoop up material. Place into appropriate waste container for disposal. Residues can be flushed away with water, considering downstream treatment.
Decontamination Equipment: Wash contaminated surface and tools with plenty of water.
Handling: Wear appropriate protective equipment. Prevent inhalation of dust. Avoid contact with skin, eyes, and clothing. Use with adequate ventilation. Do not eat, drink, or smoke in areas where this chemical is handled.
Storage: Store in a tightly closed container in a cool, dry, well-ventilated area. Protect from moisture to avoid caking. Segregate from strong acids, bases, and oxidizing materials.
Special Instructions: Label containers clearly. Keep away from incompatible materials based on supplier’s advice.
Engineering Controls: Use local exhaust ventilation or other engineering controls to keep airborne levels below recommended exposure limits. Safety shower and eye-wash station should be available.
Personal Protection: Wear goggles or face shield, gloves made of chemical-resistant material, and lab coat or chemical apron.
Respiratory Protection: Use approved dust mask or respirator if dust concentration exceeds limits.
Occupational Exposure Limits: No OSHA or ACGIH exposure limits specifically assigned for sodium phosphate monobasic, use general nuisance dust limits (e.g., OSHA PEL for Particulates Not Otherwise Regulated, 15 mg/m3 total dust).
Appearance: White crystalline powder or granules
Odor: Odorless
Odor Threshold: Not applicable
pH (1% solution): 4.4–4.8
Melting Point: 60 °C (dehydrates)
Boiling Point: Not applicable (decomposes before boiling)
Flash Point: Not applicable (not flammable)
Solubility: Highly soluble in water
Density: 2.04 g/cm3
Vapor Pressure: Not applicable
Partition Coefficient (n-octanol/water): Not determined
Chemical Stability: Stable under ordinary conditions of use and storage.
Incompatibility: Reacts with strong acids forming phosphoric acid, interacts with strong bases forming disodium phosphate.
Conditions to Avoid: Exposure to moisture, contact with incompatible materials.
Hazardous Decomposition Products: On thermal decomposition, emits toxic fumes of sodium oxides and phosphorus oxides.
Hazardous Polymerization: Will not occur
Routes of Exposure: Eyes, skin, inhalation, ingestion
Acute Effects: Causes eye irritation. Dust inhalation may result in respiratory discomfort. Ingestion may result in mild gastrointestinal upset.
Chronic Effects: Prolonged or repeated exposure may dehydrate and irritate skin and mucous membranes. No evidence for carcinogenicity, mutagenicity, reproductive toxicity in available studies.
Toxicity Data: Oral LD50 (rat): 8290 mg/kg. Data may vary between sources.
Irritation Data: Eye and skin irritant, severity depends on dose and duration.
Sensitization: Not known to cause allergic reactions
Ecotoxicity: May contribute to eutrophication if released in large amounts to water bodies. Aquatic toxicity typically low but depends on concentration.
Persistence and Degradability: Inorganic salt, does not degrade, dissociates in water.
Bioaccumulation: Not expected to bioaccumulate.
Mobility: Highly mobile in aqueous environment.
Other Adverse Effects: May upset balance in aquatic ecosystems if spills are significant.
Disposal Methods: Dispose in accordance with local, regional, and national regulations. Small quantities: dissolve in water and discharge to sewer if permitted and if downstream plant tolerates phosphates. Large quantities: deliver to authorized hazardous waste disposal facility.
Container Disposal: Rinse empty containers with water and dispose or recycle as appropriate.
Precautions: Avoid releasing large amounts into surface waters.
UN Number: Not classified as a hazardous material for transport.
Proper Shipping Name: Not regulated for transport.
Transport Hazard Class: N/A
Packing Group: N/A
Environmental Hazards: Not classified as a marine pollutant.
Special Precautions: Prevent package damage, avoid moisture contact during transportation.
TSCA Inventory: Listed
OSHA Status: Not regulated as a hazardous material under OSHA standard
SARA Title III: Not listed as a hazardous substance
RCRA Status: Not listed as hazardous waste
WHMIS Classification (Canada): Not controlled
EINECS Number: 231-449-2
Food Additive Status: Approved for use under specific regulations; check FDA and relevant country food safety authorities for maximum allowable limits and applications
Other Country-Specific Regulations: Compliance depends on intended application and jurisdiction; adhere to local legislation and safety standards
