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Chemical Name: Disodium Hydrogen Phosphate Dihydrate
Synonyms: Disodium Phosphate Dihydrate, Sodium Phosphate Dibasic Dihydrate
Chemical Formula: Na2HPO4 · 2H2O
CAS Number: 10028-24-7
EC Number: 231-448-7
Recommended Use: Analytical reagent, buffer solutions, water treatment, food additive, laboratory chemical, detergent builder
Supplier Details: Name, address, contact number available from supply chain documentation
Emergency Contact: 24-hour emergency telephone number found on product labeling
Classification: Not considered to be hazardous by GHS criteria under normal conditions
Physical Hazards: No particular fire or explosion hazard identified
Health Hazards: May cause mild irritation to eyes and skin through direct contact; large doses may cause gastrointestinal upset if swallowed
Environmental Hazards: Low risk in normal handling; excessive amounts may slightly disturb aquatic habitat if released in bulk
Label Elements: No pictogram required; precautionary statements limited to good hygiene and storage practice
Signal Word: None
Hazard Statements: None applicable under standard use
Precautionary Statements: Avoid inhalation and contact with eyes or broken skin; wash thoroughly after handling
Component: Disodium Hydrogen Phosphate Dihydrate
Chemical Formula: Na2HPO4 · 2H2O
CAS Number: 10028-24-7
Concentration: 99-100%
Impurities: Trace impurities do not alter classification
General Advice: Move exposed person to fresh air, remove contaminated clothing, keep at rest in warm, dry place
Inhalation: Remove from exposure, seek fresh air quickly; monitor for persistent cough or discomfort
Skin Contact: Wash with soap and plenty of water; remove contaminated clothing; seek medical advice if irritation persists
Eye Contact: Rinse eyes immediately with water for several minutes, lifting eyelids; seek assistance if irritation develops
Ingestion: Rinse mouth with water, drink several glasses of water; do not induce vomiting unless advised by medical professional
Advice to Physician: Symptomatic treatment for mild irritation, no chronic effects documented
Suitable Extinguishing Media: Dry chemical, carbon dioxide, water spray or regular foam
Unsuitable Extinguishing Media: No limitations; standard firefighting measures suffice
Hazardous Combustion Products: Thermal decomposition above 240°C yields sodium oxide and phosphorous oxides
Protective Equipment: Firefighters need self-contained breathing apparatus and full turnout gear if powder involved in fire
Fire and Explosion Hazards: Not flammable or explosive; does not give off hazardous vapors at ambient temperature
Special Procedures: Prevent runoff from entering storm drains or watercourses; cool in-contact containers with water
Personal Precautions: Wear safety glasses and gloves; avoid dust formation in poorly ventilated areas
Environmental Precautions: Do not allow large quantities to reach surface waters or storm drains; sweep up to avoid slick surfaces
Containment: Collect spilled solid with non-sparking tools into compatible, labeled containers
Clean-up: Wash spill area with water if needed; ventilate if powder becomes airborne
Disposal: See disposal considerations below for regulatory guidance
Handling: Use only in well-ventilated settings to avoid inhaling dust; employ methods to minimize dust generation; never handle with wet hands due to caking
Storage Conditions: Keep container tightly closed and dry, away from acids or incompatible chemicals; store at room temperature, out of direct sunlight
Incompatibilities: Avoid strong acids and strong oxidizing agents; incompatible with magnesium, aluminum, and other metals that react with alkali
Hygiene: Wash hands before eating, drinking, or smoking; remove and wash contaminated clothing at end of shift
Packaging Materials: Use sealed containers made from polyethylene, polypropylene, or glass for long-term storage
Workplace Exposure Limit: No specific OSHA or ACGIH exposure limits; dust threshold should remain below 10 mg/m3 (total dust)
Engineering Controls: General room ventilation adequate; local exhaust if dust is formed
Personal Protective Equipment (PPE): Use safety glasses or chemical splash goggles; wear lightweight gloves to avoid skin contact; laboratory coat or apron to prevent clothing contamination; use NIOSH-approved dust mask in situations where airborne powder may be present
Hygiene Measures: No eating, drinking, or smoking in work areas; keep workspace clean and free from dust accumulation
Physical State: Crystalline powder
Color: White
Odor: Odorless
pH: 8.8-9.2 (1% solution)
Melting Point / Freezing Point: Bulk decomposes above 240°C
Boiling Point: Not applicable for solid form
Flash Point: Not flammable
Evaporation Rate: Not relevant (solid)
Solubility: Readily soluble in water (7.7 g/100 mL at 25°C)
Vapor Pressure: Negligible
Relative Density: 1.52 g/cm3
Partition Coefficient (n-octanol/water): Not determined
Decomposition Temperature: Loses water below 240°C, decomposes at higher temperatures
Viscosity: Not applicable
Chemical Stability: Stable under recommended storage conditions
Reactivity: Non-reactive with standard construction and packaging materials
Hazardous Reactions: Releases phosphorous oxides under intense heat; reacts with strong acids, yielding phosphoric acid
Conditions to Avoid: Exposure to moisture causes caking; excessive heat leads to decomposition
Incompatible Materials: Strong acids, strong oxidizers, reactive metals (aluminum, magnesium)
Hazardous Decomposition Products: Sodium oxide, phosphorus oxides under fire conditions
Likely Routes of Exposure: Inhalation, ingestion, skin and eye contact
Acute Toxicity: Oral LD50 (rat) > 17,000 mg/kg; low acute toxicity
Skin Corrosion / Irritation: Slightly irritating to skin with prolonged exposure
Eye Damage / Irritation: Causes mild transient irritation
Respiratory Sensitization: Unlikely to sensitize through normal workplace exposure
Ingestion Effects: Nausea, vomiting, abdominal discomfort possible with large quantities
Chronic Effects: Repeated exposure not linked to systemic health effects in humans
Carcinogenicity: Not classified as carcinogen by IARC, NTP, OSHA
Other Effects: Not known to be mutagenic or teratogenic
Aquatic Toxicity: LC50 for fish (Leuciscus idus) > 100 mg/L (96h); low aquatic toxicity
Persistence and Degradability: Inorganic salt, readily dissociates and dilutes in natural waters
Bioaccumulation Potential: Does not bioaccumulate
Mobility in Soil: Highly soluble in water, leaches through soil, does not persist
Other Adverse Effects: Big releases could cause eutrophication in confined waters due to nutrients
Waste Treatment Methods: Small amounts can go to sanitary sewer with plenty of water following local regulations
Larger Quantities: Collect in suitable, sealed containers; contact licensed waste management company
Unclean Packaging: Rinse out thoroughly before reuse or recycling; otherwise, dispose as non-hazardous solid waste
Regulatory Status: Not classified as hazardous waste under US RCRA or EU directives
Precautions: Avoid discharge of significant quantities to surface waters
UN Number: Not regulated for transport
Transport Hazard Class: Not applicable
Packing Group: Not assigned
Shipping Name: Disodium Hydrogen Phosphate Dihydrate
Transport Labels: No hazard label needed
Other Information: Keep containers sealed during shipment; protect from water and high humidity
Road, Rail, Sea, Air: Not classified as dangerous goods under ADR, RID, IMDG, IATA
TSCA (USA): Listed on inventory
EINECS/ELINCS (Europe): Listed
REACH Status: Not subject to registration
SARA Title III: Not listed for Sections 302, 304, 313
California Prop 65: Not listed
Other Local Regulations: Meets criteria for general chemical storage; no specific restrictions applicable under GHS alignment
Labeling Requirements: No pictogram or signal word required for retail or laboratory packaging
