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Common Name: Diethyl Phthalate Chemical Formula: C12H14O4 Appearance: Clear, colorless, oily liquid Odor: Faint, aromatic, sometimes described as mild and sweet Uses: Plastics manufacturing, fragrance carrier in personal care products, denaturant in alcohol, solvent in pesticide formulations
Global Harmonized System (GHS): This chemical’s hazards usually relate to irritation. Contact with eyes or prolonged skin exposure often leads to discomfort. Some workers report mild allergic reactions or skin rashes on repeated contact. Inhalation of vapors may cause headaches or slight respiratory irritation in confined or poorly ventilated spaces, especially if exposed for several hours without breaks. Environmental problems seem limited in most developed country use cases, yet aquatic environments run a bigger risk. Routes of Exposure: Eyes, skin, inhalation, accidental ingestion Main Health Risks: Eye and skin irritation, potential for allergic reactions, mild central nervous system effects in rare prolonged exposures Environmental Risk: Harmful to aquatic life if large volumes reach rivers or lakes
Main Component: Diethyl Phthalate Chemical Purity: Most samples used in industrial practice reach above 98% purity, so impurities are usually low Contaminants: Trace amounts of related phthalates sometimes identified, though not always quantified
Eye Contact: Gently rinse eyes with plenty of water for at least 15 minutes, holding eyelids open. If pain or redness persists after flushing, seek medical attention. Skin Contact: Remove any contaminated clothing and wash affected areas vigorously with soap and water. Lingering irritation or rash deserves a doctor’s visit. Inhalation: Move affected person to fresh air. Supportive care like rest and fluids usually suffices, but anyone who feels faint or struggles to breathe should visit emergency care. Ingestion: Rinse mouth thoroughly with water. Do not induce vomiting. Get medical advice if larger amounts are swallowed or if symptoms develop.
Extinguishing Media: Use foam, dry chemical, or carbon dioxide extinguishers. Avoid water unless you can make a fine spray or fog. Hazardous Combustion Products: Burning diethyl phthalate gives off carbon monoxide, carbon dioxide, and phthalic anhydride fumes. Smoke can turn acrid. Firefighter Protection: Chemical-resistant suit and self-contained breathing apparatus are best, as the heavy vapor can overwhelm basic protective gear.
Personal Protection: Wear safety goggles and chemically resistant gloves. In larger spills, a respirator rated for organic vapors prevents exposure to heavy concentrations. Containment: Dike spill to prevent escape into drains or watercourses. Absorb small quantities with sand or commercial absorbents. Cleanup: Scoop up liquid and collect in tightly sealed, labeled steel or HDPE containers. Wipe remaining residue with damp cloths or detergent. Make sure everything used in cleanup ends up in chemical waste, not standard trash.
Handling Practices: Use only with local exhaust ventilation. Avoid open flames or sparks nearby, since the liquid vapor ignites at high enough concentrations. Skin and eye contact should be minimized by wearing long sleeves and goggles. Storage Conditions: Store in a cool, dry, well-ventilated area. Keep containers tightly closed. Separate from acids, oxidizers, strong bases, and food or feed products. Store on secondary containment like trays or basins to manage leaks.
Workplace Limits: Occupational exposure guidelines for diethyl phthalate remain less stringent than those of many solvents, but prudent management keeps airborne concentrations low by using fume hoods and extractor fans. Engineering Controls: Ventilation systems with regular filter maintenance improve air quality and keep exposure below nuisance levels. Personal Protection: Employees working with the chemical often opt for chemical-resistant gloves made from nitrile or neoprene, tightly fitted goggles or face shields, and lab coats or aprons. Respirators rated for organic vapors become important when large volumes are decanted or mixed.
Physical State: Liquid at room temperature Boiling Point: Around 298°C Melting Point: -40°C Vapor Pressure: Very low at room temperature Solubility: Limited water solubility, but wets glass and most surfaces easily. Dissolves well in organic solvents like alcohols or ethers. Density: About 1.12 g/cm³ Odor Threshold: Noticeable only at higher concentrations Flash Point: Approximately 161°C (closed cup method reported in industry guides)
Chemical Stability: Stable under most storage and use conditions Incompatible Materials: Strong oxidizing agents, concentrated strong acids, and some bases cause unwanted reactions Hazardous Reactions: Under fire conditions or strong chemical mixing, hazardous decomposition creates irritating or toxic fumes Polymerization: Does not polymerize under typical industrial or lab conditions
Acute Effects: Eyes and skin show mild to moderate irritation on direct contact. Systemic toxicity remains low, though larger ingestions can cause upset stomach, mild headaches, or, rarely, nervous system symptoms. Chronic Effects: Daily workers sometimes complain about eczema-like rashes or dryness. Some studies raise concerns about long-term exposure to certain phthalates, but scientific debate continues about human relevance at workplace levels. Sensitization: Rare cases of allergic-type reactions have been documented, usually in people with repeated, unprotected exposure over months or years. Exposure Studies: Animal studies sometimes link high doses to reproductive or developmental issues, but direct translation to short-term human exposure remains uncertain.
Aquatic Toxicity: Documented toxicity to fish and invertebrates rises at moderate and high concentrations, especially where spills enter still or slow-moving bodies of water. Bioaccumulation: Some studies show it concentrates moderately in aquatic organisms, though less than heavier phthalates. Degradation: Slow to break down in cold, low-light environments. Sunlight and certain bacteria speed up natural decomposition, yet some residues persist in sediments. Soil Migration: Generally sticks to soils and sediments rather than leaching rapidly to groundwater.
Waste Handling: All liquid waste, contaminated rags, or absorbents require disposal as hazardous chemical waste, not through municipal sewers or landfills Incineration: Approved industrial incinerators break down this chemical effectively Recycling: Some industrial sites recover and reprocess diethyl phthalate, but most smaller users rely on authorized waste firms Avoidance: Prevent the material and any containers from reaching water courses or uncontrolled landfills
UN Number: Not always classified as hazardous for transport under common UN standards, but local regulations can apply Packing Group: Usually falls outside high-risk categories due to moderate hazard profile, but large containers need secure, leak-proof packaging Shipping Name: Most transport documents simply state “Diethyl Phthalate” Transport Modes: Bulk movement via drum, IBC, or tanker, with secondary containment required during road, rail, or sea transport
Labeling Requirements: Regulations ask for chemical name, hazard pictograms warning about eye/skin irritation, and strong advice against environmental release Workplace Controls: Occupational safety agencies in several jurisdictions place exposure limits on phthalates, though specific numbers for diethyl phthalate differ across regions Consumer Legislation: Personal care and cosmetic product restrictions have followed evolving toxicology studies, especially in children’s products Environmental Regulation: Several countries include diethyl phthalate in monitoring rules for industrial discharges due to aquatic toxicity concerns
