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Product Name: Magnesium Bisulfite
Chemical Formula: Mg(HSO3)2
CAS Number: 13780-03-5
Synonyms: Magnesium hydrogen sulfite, Magnesium bisulphite
Recommended Use: Pulp and paper industry, water treatment, chemical processing
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Hazard Class: Acute toxicity (oral, inhalation), skin and eye irritation, corrosive to metals
GHS Label Elements: Warning, Corrosive, Irritant
Main Hazards: May cause burns to skin, eyes, respiratory tract; toxic if swallowed or inhaled; may release sulfur dioxide gas
Routes of Exposure: Inhalation, ingestion, skin and eye contact
Symptoms: Burning of skin and eyes, coughing, shortness of breath, headache, gastrointestinal upset
Chemical Name: Magnesium bisulfite
Concentration: Usually >90% w/w
Impurities: Magnesium sulfate, sulfurous acid, water (traces)
Other Contaminants: None significant in typical graded product
Molecular Weight: 170.39 g/mol
Inhalation: Move person into fresh air immediately; keep at rest; seek medical attention for persistent symptoms
Skin Contact: Remove contaminated clothing; flush skin with large amounts of water and mild soap; medical advice if irritation persists
Eye Contact: Rinse eyes gently but thoroughly with water for at least 15 minutes, keeping eyelids open; seek medical advice
Ingestion: Do not induce vomiting; rinse mouth; drink water if conscious; get medical help quickly
Most Important Symptoms: Burns, irritation, coughing, headache
Suitable Extinguishing Media: Use water spray, carbon dioxide, dry chemical powder, or foam
Unsuitable Media: Do not use water jet directly onto leaked material
Hazards from Combustion: Releases toxic sulfur dioxide and other sulfur oxides upon combustion
Protective Gear: Firefighters wear self-contained breathing apparatus, protective clothing
Special Procedures: Isolate fire area; prevent runoff from entering drains or waterways
Personal Precautions: Use protective gloves, goggles, respiratory protection when necessary
Environmental Precautions: Avoid discharge into drains, surface and groundwater
Cleanup Methods: Absorb spill with inert material (sand, earth); collect in suitable container for disposal; ventilate area well
Prevent Secondary Hazards: Neutralize residue with alkaline material (sodium carbonate or lime); wash spill site after material pickup
Safe Handling: Ensure adequate ventilation in work area; avoid contact with eyes, skin, clothing; avoid breathing vapors, mist
Storage Conditions: Store in tightly closed containers; keep in a cool, dry, well-ventilated place; protect from direct sunlight
Incompatible Materials: Acids, strong oxidizing agents, reducing agents
Precautions: Keep away from ignition sources; avoid buildup of mists/aerosols
Exposure Limits: Magnesium bisulfite: not established; Sulfur dioxide: OSHA PEL 5 ppm (13 mg/m³), ACGIH TLV 2 ppm (5.2 mg/m³)
Engineering Controls: Local exhaust ventilation, safety shower, eyewash stations
Personal Protective Equipment: Chemical-resistant gloves (e.g. nitrile), safety goggles/face shield, lab coat or apron, dust mask or respirator (NIOSH certified) when exposure to fumes is possible
Hygiene Measures: Wash hands thoroughly after handling; do not eat, drink, or smoke while working with the product
Appearance: White to off-white crystalline solid
Odor: Faint sulfurous (like SO2)
Odor Threshold: Low
pH (in solution): Acidic, typically 2.0–3.5
Melting Point: Decomposes before melting (decomposition temp: >100°C)
Boiling Point: Not applicable (decomposes on heating)
Solubility in Water: Highly soluble
Density: Approximately 1.5–1.7 g/cm³
Vapor Density: Not applicable
Vapor Pressure: Not determined
Flash Point: Not flammable
Partition Coefficient (n-octanol/water): Not applicable
Viscosity: Not applicable
Chemical Stability: Stable under recommended storage; decomposes on exposure to heat, strong acids or oxidizers
Conditions to Avoid: Heat, moisture, incompatible materials
Hazardous Reactions: Contact with acids releases sulfur dioxide gas
Incompatible Materials: Acids (especially strong), oxidizers, strong alkalis
Hazardous Decomposition Products: Sulfur dioxide, sulfur trioxide, magnesium oxide, hydrogen sulfide (in absence of oxygen)
Acute Toxicity: Harmful if inhaled, swallowed, or in contact with skin; LD50 values are not well established for all routes
Chronic Effects: Prolonged skin contact may cause dermatitis; repeated exposure may sensitize skin or cause respiratory issues
Potential Health Effects: Eye and skin burns, respiratory distress, headache, nausea, vomiting
Carcinogenicity: Not listed as carcinogenic by IARC, NTP, or OSHA
Sensitization: May cause allergic skin reaction in predisposed individuals
Ecotoxicity: Harmful to aquatic organisms at high concentrations
Persistence: Dissociates in water to magnesium ions and bisulfite; further oxidizes to sulfate
Bioaccumulation Potential: Low because sulfate and magnesium ions are not bioaccumulative
Mobility in Soil: High mobility, will migrate to surface and groundwaters
Other Adverse Effects: Can lower pH of water bodies, impacting aquatic life
Disposal Methods: Dispose of in accordance with local, regional, and national regulations; treat with alkaline neutralizer before disposal
Container Disposal: Empty containers should be rinsed, then disposed of as per hazardous chemical waste regulations
Special Precautions: Do not release product into sewers, waterways, or soil
Recommended Treatment: Neutralize and dilute, then direct to permitted chemical waste treatment facility
UN Number: Not classified as dangerous for transport under UN Recommendations
Proper Shipping Name: Magnesium bisulfite
Transport Hazard Class: Not regulated
Packing Group: Not assigned
Special Precautions: Avoid load shifts and moisture exposure during transit
OSHA Status: Hazardous chemical as defined by OSHA Hazard Communication Standard
TSCA Status: Listed on the TSCA inventory
SARA Title III: Not subject to reporting under Sections 302, 304, or 313
Canadian WHMIS Classification: Classified as hazardous
Other Regulations: Subject to any applicable state, local, and international chemical safety regulations
