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Chemical Name: Dioctyl Terephthalate
Common Names: DOTP, DEHT
CAS Number: 6422-86-2
Intended Use: Commonly used as a plasticizer in flexible PVC products, cabling, flooring, wall coverings, and synthetic leather.
Physical Hazards: Non-flammable under normal storage and use. Not expected to produce hazardous vapors at ambient temperature.
Health Hazards: Low toxicity in typical usage. Inhalation of mist, skin, or eye contact may cause irritation. No significant evidence points to carcinogenic risks after repeated exposure.
Environmental Hazards: Slight toxicity to aquatic life reported in some lab studies. Not rapidly biodegradable in soil or water, which brings concerns about long-term accumulation if accidentally released.
Substance: Dioctyl Terephthalate (purity typically exceeds 99 percent).
Impurities: Trace phthalates or related esters, generally less than 1 percent.
Additives: Some commercially available DOTP might contain antioxidants or stabilizers for product longevity, but these additives remain minor by weight.
Eye Contact: Flush affected eyes with water. Remove contact lenses if present.
Skin Contact: Wash thoroughly with soap and water. Remove contaminated clothing.
Inhalation: Move to fresh air. Seek medical attention if symptoms develop.
Ingestion: Rinse mouth. Seek medical attention if large amounts swallowed.
Suitable Extinguishing Media: Use foam, dry chemical, or carbon dioxide for fires involving DOTP.
Special Hazards: Heating may release potentially irritating or toxic fumes, such as carbon monoxide, carbon dioxide, and other organic compounds.
Protective Equipment: Firefighters should use standard protective equipment, including self-contained breathing apparatus, to avoid exposure to fumes.
Personal Safety: Use gloves and goggles during clean-up, especially if spill spreads over a large area.
Environmental Protection: Prevent entry into drains and watercourses. Notify authorities if significant environmental contamination occurs.
Cleanup Methods: Absorb liquid with sand or an inert material before transferring to containers for disposal. Clean the spill area with soap and water after solids removed.
Safe Handling: Minimize dust production. Handle in well-ventilated spaces. Avoid contact with skin, eyes, and clothing.
Storage: Store in tightly closed containers, in a cool and dry area, away from direct sunlight and incompatible chemicals like strong oxidizers.
Personal Hygiene: Wash hands after handling. Change contaminated clothing before relaunching regular activities.
Occupational Limits: No specific occupational exposure limits set in most jurisdictions, but monitoring airborne concentrations proves wise.
Engineering Controls: Install adequate ventilation, particularly in processing areas and during mixing or pouring.
PPE Recommendations: Gloves and eye protection to prevent direct contact, especially in bulk handling or where splashing may occur. Respiratory protection only needed in poorly ventilated areas where mist or vapor forms.
Appearance: Clear, colorless, oily liquid.
Odor: Faint, slightly sweet.
Melting Point: Below -40°C
Boiling Point: 385–400°C
Vapor Pressure: Very low at room temperature.
Solubility: Insoluble in water, miscible with most organic solvents.
Viscosity: Moderate oil-like flow at ambient temperatures.
Chemical Stability: Stable under normal storage and use conditions.
Reactivity: Reacts with strong oxidizers. Decomposes at temperatures above 400°C, forming hazardous combustion products.
Incompatible Materials: Strong acids, alkalis, and oxidizing substances.
Acute Toxicity: Shows low acute oral and dermal toxicity in animal testing.
Sensitization: Unlikely to cause allergy or sensitization.
Chronic Effects: Long-term studies report no significant health effects from repeated low-level exposure, but some concerns remain for misuse or massive ingestion.
Carcinogenicity/Mutagenicity: Neither IARC nor other authorities classify DOTP as a carcinogen; negative in bacterial mutagenicity assays.
Aquatic Toxicity: Exhibits very low toxicity to aquatic species in standard tests.
Persistence: Not readily biodegradable. Expected to remain in soils and sediments over long periods.
Bioaccumulation: Shows little tendency to build up in animal tissues based on log Kow measurements, but repeated releases into the environment can present problems for ecosystems.
Disposal Methods: Incinerate in an approved facility if local regulations allow. Avoid landfill unless waste cannot be recycled or incinerated.
Regulatory Compliance: Collect and manage wastes according to national, regional, and local regulations.
Packaging: Decontaminate empty containers before disposal or reuse.
UN Number and Shipping Name: Not classified as hazardous for transportation by major agencies.
Proper Shipping Practices: Use sealed containers or drums, secure loads to prevent movement and ensure labels clearly indicate contents for safe identification during transit.
Special Precautions: Avoid transport with incompatible materials, including strong oxidizers.
Classification: Not formally listed as hazardous under global chemical inventories, including TSCA, REACH, or the Canadian DSL.
Labeling: Manufacturers assign safe handling precautions based on workplace risk assessments, often marked for industrial use only.
Restrictions: Certain European and Asian jurisdictions continue to evaluate DOTP due to broader concerns about phthalate analogs; ongoing regulatory review highlights the importance of product stewardship and regular hazard updates.
