Product Name: Trans-2-hexenal propylene glycol acetal
Chemical Formula: C9H18O3
Chemical Family: Aldehyde acetals
Use: Fragrance ingredient, flavoring agent
Manufacturer: Major chemical suppliers specializing in aroma compounds
Emergency Contact: Chemtrec, 24/7, with direct phone and email support
CAS Number: 67674-46-8
Synonyms: 2-Hexenal, 2-propyleneglycol acetal; 2-hexenal, dihydroxypropane acetal
Hazard Classification: Eye irritation, skin sensitizer, possible respiratory tract irritation
GHS Label Elements: Exclamation mark symbol
Signal Word: Warning
Hazard Statements: Causes skin irritation. Causes serious eye irritation. May cause an allergic skin reaction. Harmful if swallowed or inhaled
Precautionary Statements: Avoid breathing dust, fumes, gas, mist, vapors, spray. Wear protective gloves, eye protection. Wash hands thoroughly after handling. Contaminated work clothing should not be allowed out of the workplace. If on skin: Wash with plenty of water
Chemical Name: Trans-2-hexenal propylene glycol acetal
CAS Number: 67674-46-8
Concentration: 95–99% by weight
Impurities: Traces of hexanal, propylene glycol, residual solvents typical for production
Stabilizers or Additives: None reported in standard commercial product
Inhalation: Remove to fresh air promptly. Provide oxygen or artificial respiration if breathing is difficult. Seek medical attention in case of continued symptoms
Skin Contact: Remove contaminated clothing. Wash affected area with soap and plenty of water. Watch for delayed skin reactions
Eye Contact: Immediately flush with water for at least 15 minutes, lifting upper and lower eyelids. Remove contact lenses if present and easy to do
Ingestion: Rinse mouth thoroughly. Do not induce vomiting unless medical personnel direct it. Call a poison center or physician
Symptoms: Burning sensation, redness, rash, tearing, coughing, headache possible after exposure
Suitable Extinguishing Media: Use water spray, alcohol-resistant foam, dry chemical, or carbon dioxide
Unsuitable Media: Direct water jet, which might spread burning material
Fire Hazards: Vapors may form explosive mixtures with air. Gives off irritating or toxic fumes, including carbon monoxide and carbon dioxide
Protective Equipment for Firefighters: Wear positive-pressure self-contained breathing apparatus and full protective gear
Special Precautions: Cool containers exposed to fire with water spray. Evacuate area and prevent runoff from entering drains or water sources
Personal Precautions: Avoid breathing vapors. Wear gloves, goggles, and protective clothing. Provide adequate ventilation
Environmental Precautions: Prevent from entering soil, sewers, and waterways. Notify authorities if contamination occurs
Spill Cleanup Methods: Absorb with inert material such as sand or vermiculite. Transfer to a chemical waste container. Wash area with water, ventilate
Disposal of Contaminated Material: Dispose of in accordance with local, regional, and national regulations. Label and seal waste containers thoroughly
Handling: Minimize contact with skin and eyes. Use only in well-ventilated areas. Keep container tightly closed. Avoid inhaling mist or vapor
Storage Conditions: Store in a cool, dry, well-ventilated area. Keep containers away from heat, sparks, flame, and direct sunlight. Do not store near acids or oxidizers
Packaging Materials: Use corrosion-resistant containers with secure lids. Check containers regularly for leaks
Exposure Limits: No specific occupational exposure limit set by OSHA, ACGIH, or other bodies
Engineering Controls: Use local exhaust ventilation, eye wash stations, and safety showers. Maintain airborne concentrations below nuisance levels
Personal Protective Equipment: Chemical-resistant gloves, laboratory coat, chemical splash goggles, respirator in case of inadequate ventilation
Hygiene Measures: Wash hands after handling. Do not eat, drink, or smoke in work areas. Remove contaminated clothing immediately on contact
Appearance: Colorless to pale yellow, clear liquid
Odor: Green, vegetable-like, characteristic of trans-2-hexenal derivatives
Odor Threshold: Detectable at low concentrations
pH: Not applicable (neutral organic compound)
Melting Point/Freezing Point: Below –30°C
Boiling Point: About 220°C
Flash Point: 93°C (closed cup)
Evaporation Rate: Slow at room temperature
Flammability: Combustible liquid
Vapor Pressure: Low at 20°C
Solubility: Slightly soluble in water, soluble in ethanol and most organic solvents
Partition Coefficient (log Kow): Estimated 2.5–3.0
Decomposition Temperature: >200°C
Viscosity: Low
Chemical Stability: Stable under recommended storage conditions
Reactivity: Unreactive under normal handling; reacts with strong oxidizers, acids
Conditions to Avoid: Heat, flames, ignition sources, prolonged exposure to air or light
Incompatible Materials: Strong acids, alkalis, oxidizing agents
Hazardous Decomposition Products: Carbon monoxide, carbon dioxide, possibly acrolein and formaldehyde under fire or severe heating
Acute Toxicity: Oral LD₅₀ (rat): estimated 3000 mg/kg; inhalation and skin toxicity low
Skin Corrosion/Irritation: Causes moderate skin irritation, may cause sensitization in some individuals
Serious Eye Damage/Irritation: Produces moderate to severe eye irritation
Respiratory or Skin Sensitization: Potential for allergic reaction on repeated or prolonged contact
Genotoxicity: No evidence of mutagenicity in standard tests
Carcinogenicity: Not classified as carcinogenic by IARC, NTP, or OSHA
Reproductive Toxicity: Toxicity data lacking; not suspected to impair fertility or development according to available information
Other Health Effects: Data gap for chronic exposure
Ecotoxicity: Toxic to aquatic life with long-lasting effects (estimated EC₅₀ <100 mg/L for aquatic organisms)
Persistence and Degradability: Readily biodegradable in the environment, but by-products may pose risk
Bioaccumulative Potential: Moderate (log Kow 2.5–3.0), may accumulate in aquatic organisms
Mobility in Soil: Low mobility expected in soil; volatile loss from surface
Other Adverse Effects: No reported ozone depletion, but run-off can disrupt biological wastewater treatment
Waste Treatment Methods: Burn in licensed chemical incinerator with afterburner and scrubber
Contaminated Packaging: Treat as hazardous chemical waste. Triple rinse and puncture before disposal if regulations allow
Regulatory Requirements: Follow all state, federal, and local regulations. Do not dispose of into environment, drains, or surface water
Recycling/Reuse Potential: Not recommended for consumer reuse; industrial processes should capture residues for professional waste treatment
UN Number: 1993
Proper Shipping Name: Flammable liquid, n.o.s. (contains trans-2-hexenal propylene glycol acetal)
Transport Hazard Class: 3 (Flammable Liquids)
Packing Group: III
Environmental Hazards: Marine pollutant (IMDG code applies for transport by sea)
Transport Labels: Flammable liquid symbol, marine pollutant label for ocean freight
Special Precautions: Secure containers upright, avoid temperature extremes, carry emergency spill containment kits on transport vehicles
US EPA Status: Not listed as a hazardous air pollutant; subject to reporting for releases over 1000 lbs under CERCLA
TSCA Inventory: Listed
REACH Registration (EU): Covered under intermediate use; safety reports required for volume thresholds
OSHA: General workplace controls for flammable liquids
Other Regulations: SARA 311/312: Fire hazard, acute health hazard. Not subject to specific state restrictions, but local handling and storage codes may apply
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