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Chemical Name: Triethyl phosphite
Synonyms: Phosphorous acid, triethyl ester
Molecular Formula: C6H15O3P
CAS Number: 122-52-1
Typical Use: People often see this liquid as a starting material for organic syntheses, flame retardants, and sometimes as a chemical intermediate in certain pesticides or pharmaceuticals.
Appearance: Clear, colorless liquid with a strong, pungent odor.
Classification: Flammable liquid, harmful if swallowed, skin and eye irritant
Main Hazards: Contact can cause irritation to eyes, skin, and respiratory system; vapor may cause drowsiness or dizziness; can catch fire if near open flame or heat source.
Pictogram Reminders: Flammable liquid symbol, exclamation mark for irritant effects.
Potential Long-term Effects: Prolonged exposure may lead to chronic irritation or sensitization, and breathing in vapors over and over can tire out the respiratory system fast.
Main Ingredient: Triethyl phosphite (purity usually above 98%)
Impurities: Minor traces of related phosphite esters or residual solvents from manufacturing.
No significant additives: People using this in a lab or plant setting rarely see anything else mixed in.
For Eye Contact: Immediately flush eyes with plenty of water, hold eyelids open, rinse for at least 15 minutes, get medical help after getting rinse started.
For Skin Contact: Remove contaminated clothing, wash skin thoroughly with soap and water, seek help if irritation sticks around.
If Inhaled: Move person to fresh air instantly, support breathing if needed, and seek medical attention for symptoms like shortness of breath, wheezing, or cough.
If Swallowed: Rinse mouth, never force vomiting, get a doctor right away.
Extinguishing Media: Use dry chemical, foam, or carbon dioxide, water spray works for cooling tanks but not for putting out the fire itself.
Fire Hazards: Vapors are heavier than air and can travel a distance to an ignition source; combustion releases toxic gases including phosphine, carbon monoxide, and oxides of phosphorus.
Protective Equipment: Firefighters should pull on self-contained breathing apparatus and full protective gear; stay upwind and avoid runoff into drains.
Personal Precautions: Make sure there’s enough ventilation, don chemical splash goggles and chemical-resistant gloves, avoid breathing vapors.
Spill Cleanup: Stop leak if safe, use inert absorbent materials like sand or earth, sweep up and place in approved chemical waste container, ventilate the area.
Environmental Precautions: Prevent leaking material from running into drains, surface water, or soil.
Handling: Always handle in well-ventilated spots, keep containers sealed tightly, wear suitable gloves and goggles, and wash hands before eating or drinking.
Storage: Store in cool, dry, and well-ventilated space, keep out of direct sunlight, keep apart from oxidizers, acids, water, and sources of ignition.
Compatibility: Avoid storing near strong oxidizing agents, acids, or sources of heat; reacts with water or moisture over time, can produce flammable gases.
Engineering Controls: Fume hoods, splash shields, and good general room ventilation help keep vapor and mist down.
Personal Protective Equipment: Chemical-resistant gloves (such as nitrile), apron, splash goggles, closed shoes.
Respiratory Protection: Air-purifying respirator with organic vapor cartridge for high vapor concentrations.
Exposure Limits: No specific occupational exposure limits widely established, but minimize exposure using best practices found in the chemical industry.
Appearance: Clear, colorless, oily liquid
Odor: Strong, penetrating, garlic-like smell
Boiling Point: Around 156°C-158°C
Melting Point: Below 0°C
Density: About 0.97 g/cm3
Vapor Pressure: Low at room temperature
Solubility: Slightly soluble in water, mixes well with organic solvents
Flash Point: About 57°C (closed cup)
Chemical Stability: Stable under most recommended storage and handling conditions, breaks down slowly when exposed to water or damp air.
Incompatible Materials: Strong oxidizers, acids, bases, water, and moisture.
Decomposition Products: In case of fire or strong heating, gives off nasty, toxic fumes like phosphine, oxides of phosphorus, and carbon monoxide.
Hazardous Polymerization: Not likely to kick off under normal conditions, but uncontrolled mixing with chemicals above can cause issues.
Acute Effects: Can irritate the eyes, nose, throat, and skin on contact; inhaling concentrated vapors causes headaches, nausea, dizziness, or drowsiness.
Chronic Effects: Over time, repeat contact may dry or crack the skin, trigger allergic reactions, or wear on lung health.
Significant Routes of Exposure: Skin, eyes, and breathing in vapor.
Carcinogenicity: No evidence of cancer links in available literature, but worker experience drives extra caution when handling any organophosphorus compound.
Environmental Impact: Breaks down slowly in water and soil, doesn’t build up in plants or animals, but toxic toward aquatic life at higher concentrations.
Persistence and Degradability: Takes time to break down unless exposed to good sunlight or robust microbial action.
Bioaccumulation: Tends not to climb up the food chain.
Advice: Runoff, spills, or careless draining carry risks for fish, so always keep material away from stormwater channels or open ditches.
Waste Treatment: Never pour down sink or toss in regular trash. Incinerate in chemical waste facilities equipped for neutralizing organophosphates.
Container Handling: Empty containers should be triple-rinsed and disposed of as hazardous chemical waste, never reused.
Legal Regulations: Most regions treat organophosphates as hazardous, so follow local and national hazardous waste procedures closely.
UN Number: 2328
Shipping Name: Triethyl phosphite
Transport Hazard Class: Flammable liquid, Class 3
Packing Group: III
Special Handling: Carriage in secure, upright containers with proper labeling and secondary containment helps avoid spills; drivers and handlers must know emergency procedures for leaks or fires.
Workplace Safety: OSHA lists general rules for handling flammable liquids, but country-specific regulations can list triethyl phosphite as hazardous or require reporting for large storage or accidental releases.
Environmental Controls: Restrictions come in for disposal and accidental release because of risk to waterways and aquatic life.
Labeling: Packaging rules demand hazard warning statements and clear signage to underscore health and fire risks.
Community Right-to-Know: Reporting duties may fall under chemical inventory and emergency response legislation where large quantities are stored or used.
