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Product Name: Sodium Sesquicarbonate
Synonyms: Trona, Disodium carbonate, Disodium hydrogen carbonate
Chemical Formula: Na2CO3·NaHCO3·2H2O
CAS Number: 533-96-0
Recommended Use: Water softener, household cleaning agent, pH adjuster, detergent builder, swimming pool maintenance
Manufacturer Details: Refer to the supplier’s contact information and emergency phone number on the label or company website
Emergency Contact: Chemtrec (for incidents in the United States: 1-800-424-9300)
Classification: Not classified as hazardous under GHS; may cause slight irritation to eyes and skin
Physical Hazards: Mildly alkaline substance, dust may cause nuisance
Health Hazards: Eyes: irritant, Skin: possible mild irritation, Inhalation: upper respiratory tract discomfort from dust, Ingestion: gastrointestinal discomfort if consumed in large amounts
Environmental Hazards: Low risk to aquatic and terrestrial ecosystems at typical usage rates
GHS Label Elements: No symbol required, signal word: none, precautionary statements: avoid unnecessary exposure to dust
Other Hazards: Hygroscopic; absorbs moisture from the air and may cake in storage
Chemical Identity: Sodium Sesquicarbonate
Concentration: 99–100% by weight
Impurities: May include trace amounts of chloride and sulfate salts
EC Number: 258-707-9
Molecular Weight: 210.99 g/mol
No hazardous impurities above regulatory disclosure limits present
Eye Contact: Rinse cautiously with water for at least 15 minutes, remove contact lenses if present and easy to do, seek medical attention if irritation persists
Skin Contact: Rinse skin with gentle flow of water, remove contaminated clothing, wash with mild soap and water, seek medical attention if redness or discomfort develops
Inhalation: Remove to fresh air, rest in a position comfortable for breathing, seek medical advice in case of persistent symptoms like coughing or difficulty breathing
Ingestion: Rinse mouth with water, drink small amounts of water, do not induce vomiting, seek medical advice for large ingestion or persistent symptoms
Most Important Symptoms: Mild irritation of skin, eyes, or throat
Notes for Physicians: Treat supportively and symptomatically, no specific antidote known
Suitable Extinguishing Media: Water spray, dry chemical, foam, or carbon dioxide
Unsuitable Media: None known specific to product
Hazards from Combustion Products: Product itself is not flammable, does not generate toxic gases when heated
Fire-Fighting Instructions: Wear suitable protective equipment, avoid inhalation of dust, move containers from fire area if possible without risk, cool containers with water spray
Protective Equipment: Full protective clothing and self-contained breathing apparatus for large fires
Other Information: Sodium sesquicarbonate can act as an extinguisher for some small acid spills due to its alkaline nature
Personal Precautions: Wear dust mask, goggles, chemical-resistant gloves to minimize skin and eye contact
Environmental Precautions: Prevent entry of large spills into rivers and drains by constructing barriers or bunding
Spill Cleanup Methods: Sweep or shave up solid material without generating dust, collect in labeled containers for reuse or disposal, ventilate area
Reference to Other Sections: See section on personal protection for necessary equipment
Handling: Use in well-ventilated spaces, avoid generating or breathing dust, avoid direct contact with skin and eyes, do not eat, drink, or smoke while using product
Storage Conditions: Store in cool, dry place, keep container tightly closed, protect from moisture, separate from acids to prevent neutralization or unwanted reactions
Incompatible Materials: Strong acids, strong oxidizers
Safe Transfer: Use scoop or mechanical transfer, minimize dust generation
Occupational Exposure Limits: None established by OSHA, ACGIH, or NIOSH for sodium sesquicarbonate; total nuisance dust limit applies (15 mg/m³ total dust, 5 mg/m³ respirable fraction)
Engineering Controls: Use local exhaust or general ventilation to keep airborne dust below nuisance levels
Personal Protective Equipment: Respiratory protection: N95 or equivalent dust mask for dusty conditions; Eye protection: safety glasses or chemical goggles; Skin protection: gloves and long-sleeved clothing if contact likely
Decontamination and Hygiene: Wash hands after handling, launder soiled clothing before reuse, provide eyewash facilities in the workplace
Appearance: White, granular or crystalline powder
Odor: Odorless
Odor Threshold: Not applicable
pH: 10.0–11.5 (1% solution in water)
Melting Point: Decomposes above 100°C
Boiling Point: Not applicable (decomposes before boiling)
Solubility in Water: 13g/100mL at 20°C
Density: 2.12 g/cm³
Vapor Pressure: Not applicable (non-volatile solid)
Vapor Density: Not applicable
Evaporation Rate: Not applicable
Flash Point: Not flammable
Auto-ignition Temperature: Not applicable
Explosive Properties: Not explosive
Partition Coefficient: Not applicable
Viscosity: Not applicable
Hygroscopic: Tendency to absorb moisture and cake when exposed to humid air
Chemical Stability: Stable under normal storage and handling conditions
Reactivity: Reacts with acids to release carbon dioxide, formation of heat possible
Conditions to Avoid: Moisture, strong heat, contact with acids
Incompatible Materials: Acids, strong oxidizers, moisture
Hazardous Decomposition Products: Carbon dioxide released on contact with acids
Polymerization: Will not occur
Routes of Exposure: Inhalation, ingestion, eye and skin contact
Acute Toxicity: LD50 oral (rat) > 4000 mg/kg shows low toxicity
Eye Irritation: Mild irritation possible
Skin Irritation: Prolonged contact may cause slight irritation, not corrosive
Inhalation: Dust may cause coughing, sneezing, or irritation of the respiratory tract
Chronic Effects: No evidence of mutagenicity, carcinogenicity, or reproductive toxicity based on existing data
Sensitization: Not expected to cause allergic reactions
Medical Conditions Aggravated: Pre-existing upper respiratory or skin conditions may be worsened by repeated exposure to high dust levels
Ecotoxicity: Low toxicity to aquatic life under normal use
Persistence and Degradability: Fully dissociates into natural ions (sodium, carbonate, bicarbonate), does not persist as a whole compound
Bioaccumulative Potential: Does not bioaccumulate
Mobility in Soil: Readily migrates with water, alters pH near areas of large spills
Other Adverse Effects: Elevated concentrations in surface water can raise local pH, which may harm sensitive aquatic species
Disposal Methods: Small quantities can be diluted with plenty of water and flushed to drain according to local regulations
Large Quantities: Dispose of at approved landfill or treatment facility, in accordance with environmental regulations
Packaging: Rinse containers before recycling or disposal, remove and destroy labels
Special Precautions: Avoid disposal in areas where runoff could reach natural water bodies
UN Number: Not regulated for transport
Proper Shipping Name: Not classified as hazardous
Transport Hazard Class: Not applicable
Packing Group: Not applicable
Land (DOT): Not regulated
Sea (IMDG): Not regulated
Air (IATA): Not regulated
Special Precautions: Protect packaging from moisture during transport
TSCA Status: Listed on the U.S. Toxic Substances Control Act Inventory
DSL/NDSL (Canada): Listed
OSHA: Not hazardous under OSHA Hazard Communication Standard
WHMIS Classification (Canada): Not controlled
REACH (EU): Exempt from registration as a known mineral
California Proposition 65: Not listed
SARA Title III: Not listed as a hazardous substance or extremely hazardous substance
Other Local, National, or International Regulations: No specific regulatory requirements unique to sodium sesquicarbonate beyond basic safety data requirements
West Ujimqin Banner, Xilingol League, Inner Mongolia, China
