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Name: Tetrakis(hydroxymethyl)phosphonium sulfate
Common Use: Biocide, flame retardant, preservative in oilfields
Appearance: Clear to pale yellow liquid
Odor: Slight, sometimes pungent
Chemical Family: Organophosphorus compound
CAS Number: 55566-30-8
Acute Toxicity: Harmful if swallowed or inhaled
Corrosivity: Causes severe skin burns and eye damage
Respiratory Effects: Can irritate nose, throat, lungs
Environmental Harm: Toxic to aquatic life
Long-Term Exposure: Potentially damages the nervous system
Physical Risks: Not highly flammable, but decomposes to release toxic fumes
Warning Symbols: Corrosive, toxic, environmental hazard
Active Ingredient: Tetrakis(hydroxymethyl)phosphonium sulfate (THPS) at high concentration
Byproducts & Impurities: Trace formaldehyde, other phosphonium salts
Mixture Type: Aqueous solution
Eye Contact: Immediate flush with water for at least 15 minutes, seek emergency care
Skin Contact: Remove contaminated clothing, rinse skin countless minutes, medical attention necessary
Inhalation: Remove to fresh air, support breathing as needed, see physician
Ingestion: Rinse mouth, do not induce vomiting, call for professional help right away
Continued Monitoring: Even minor contact justifies health checks with chemicals this corrosive
Suitable Extinguishing Media: Foam, dry chemical, carbon dioxide, water spray
Special Hazards: Emits toxic fumes of phosphorus oxides and sulfur oxides at high heat
Protective Equipment: Firefighters should use full protective gear, self-contained breathing apparatus
Explosion Potential: Not highly explosive but always unpredictable in large, heated spills
Evacuation: Get people away from area quickly, ventilate enclosed places
Spill Management: Wear full PPE, contain run-off, use absorbent inert material like sand or earth
Cleanup: Scoop material into chemical waste containers, never release into sewers or natural waters
Decontamination: Wash area thoroughly, monitor for residue
Personal Protection: Avoid direct contact; vapor monitoring can signal further risk
Safe Handling: Practice strict hygiene, avoid inhalation or skin/eye exposure
Engineering Controls: Use chemical fume hoods or local exhaust ventilation
Storage Conditions: Keep in tightly closed corrosion-resistant containers, store in a cool, well-ventilated area
Separation: Avoid storage with strong oxidizers, acids, or bases
Regular Inspections: Check containers for leaks or corrosion
Engineering Controls: Local exhaust, closed systems, ventilation
Personal Protection: Chemical-resistant gloves, goggles, face shield, long clothing
Respiratory Equipment: If ventilation inadequate, use appropriate respirators
Hygienic Practices: Thorough hand washing before eating or drinking, no smoking in hazardous zones
Exposure Limits: No universally established occupational exposure limits, but lower is safer
Physical State: Liquid, water-based solution
Color: Clear to pale yellow
Odor: Weak, sometimes pungent
Boiling Point: Decomposes before boiling
pH: Acidic
Solubility: Highly soluble in water
Density: Heavier than water
Vapor Pressure: Low under normal conditions
Chemical Stability: Stable at normal temperatures and pressures in closed containers
Reactivity: Reacts with strong oxidizers, strong acids/alkalis
Hazardous Decomposition: Releases phosphorus oxides, sulfur oxides, formaldehyde fumes when heated
Polymerization: Unlikely under standard storage but risk increases with contamination or temperature swings
Container Sensitivity: Metal containers may corrode or leak over time due to acidic solution
Acute Exposure: Severe irritation, corrosive burns on contact
Chronic Exposure: Limited data; concerns about long-term neurological effects
Sensitization: Some reports of skin sensitization and allergies
Route of Entry: Absorbed via skin, inhalation, or swallowing
Short-Term Effects: Coughing, difficulty breathing, ulceration at contact sites
Long-Term Effects: Possible liver, kidney, nervous system impacts
Toxicity Data: Oral, rat LD50 values roughly 640 mg/kg; high acute toxicity
Aquatic Impact: Very toxic to fish and other aquatic organisms at low concentrations
Degradation: Breaks down slowly in water; breakdown products may persist
Bioaccumulation: Low tendency, but repeated environmental discharges cause cumulative harm
Environmental Persistence: Environmental agencies concern themselves with long-term effects
Soil Mobility: Easily moves in soil and groundwater
Disposal Methods: Treat as hazardous chemical waste; chemical neutralization or certified incineration
Sewer Disposal: Strictly forbidden, legal penalties apply
Container Disposal: Triple rinse empty containers before disposal, follow local hazardous waste rules
Waste Minimization: Collect spills, avoid unnecessary use, recycle water used for dilution if possible
Mode of Transport: Road, rail, sea, air allowed under controlled conditions
Packaging: Certified corrosion-resistant drums or IBCs
Labelling: Clear labeling for corrosive, toxic, and aquatic risk
Transport Risks: Spillage or leak during transport can cause large-scale emergencies
Handling Precautions: Avoid shock, keep away from incompatible materials during transit
International Regulations: Most global regulations treat THPS as a dangerous good in transport
Chemical Control: Included under hazardous chemicals regulations in many countries
OSHA/HSE: Requires strict compliance with workplace protections
Environmental Law: Releases to water, air, or soil subject to reporting and cleanup mandates
Usage Restrictions: Only trained personnel may handle large quantities
Product Labeling: Strong warning and risk instructions appear on any legal product packaging
Record Keeping: Companies using THPS keep records of usage, disposal, accidents as required by law
