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Chemical Name: Dioctylphthalate
Synonyms: Di(2-ethylhexyl) phthalate, DEHP
CAS Number: 117-81-7
Formula: C24H38O4
Appearance: Clear, colorless to slightly pale viscous liquid
Odor: Slight, sometimes described as faintly aromatic or oily
Common Uses: Plasticizer in flexible PVC, adhesives, paints, and sealants; present in some children’s toys, flooring, cables, and coated fabrics
Health Risks: Dioctylphthalate can impact reproductive health. Experiments have shown it can lower fertility in animal studies and may cause developmental abnormalities when exposure is high or prolonged. Some agencies classify it as a possible human carcinogen. There are concerns about long-term exposure leading to hormone disruption.
Physical Hazards: The liquid is combustible under high temperatures, and vapor formation in poorly ventilated environments boosts fire danger. It usually doesn’t explode on its own, but mixing with other chemicals could change that risk.
Environmental Hazards: This chemical lingers in the environment and builds up in wildlife. Aquatic organisms are sensitive to relatively low concentrations, so unmanaged spills near water are a real problem.
Main Ingredient: 99% or higher Dioctylphthalate (CAS: 117-81-7)
Impurities: Typical batches can contain trace amounts of isomers or incomplete esterification products, but these do not usually contribute significantly to overall risk compared to the main component.
Inhalation: Migraines, dizziness, sore throat, and breathing trouble can happen after inhaling strong vapors. Leaving the area for fresh air helps; persistent symptoms need medical attention.
Skin Contact: Prolonged exposure causes irritation, mild redness, or drying. Washing exposed skin with warm water and soap works best. Removing contaminated clothing makes a big difference.
Eye Contact: If this liquid gets in your eyes, you’ll feel stinging and redness. Flush eyes with clean running water—don’t rub—and see a doctor if the pain persists.
Ingestion: Swallowing large volumes leads to stomach upset, diarrhea, or more severe symptoms in high doses. Demanding emergency care makes more sense than waiting things out.
Suitable Extinguishers: Carbon dioxide, dry chemicals, or alcohol-resistant foams put out most fires involving Dioctylphthalate. Water mist works if nothing else is available, but straight water streams are less reliable.
Special Dangers: Burning creates noxious gases—think carbon monoxide and phthalic anhydride—so staying upwind and wearing breathing gear is crucial for anyone fighting these fires. Spilled material near heat sources brings up the temperature and raises risk.
Protective Gear: Full protective suits, gloves, and self-contained breathing apparatus help keep responders from breathing or absorbing toxic fumes during firefighting.
Personal Protection: Rubber gloves, eye protection, and chemical-resistant boots keep exposure in check. Limiting unprotected access keeps bystanders safe.
Containment: Absorbent materials like sand, earth, or vermiculite work for small spills. Preventing runoff into drains and waterways matters more in outdoor settings.
Cleanup: Shovel or scoop solid residues and contaminated absorbents into sealed metal or plastic drums for disposal, following up with detergent and plenty of water for the final clean.
Ventilation: Boosting airflow minimizes inhalation risk after a spill, and sharp odors mean it’s time to air out the area.
Handling Precautions: Any open transfer requires gloves and goggles. Mechanical ventilation inside workplaces keeps air concentrations low and limits headaches and nausea. Never eat or smoke near product handling areas.
Storage Requirements: Store in tightly sealed containers away from heat, sparks, open flame, or direct sunlight. A cool, dry, well-ventilated environment slows breakdown and reduces accident risk. Keep away from strong acids, bases, and oxidizers that might trigger dangerous reactions.
Bulk Storage: Outdoor containment berms or dedicated spill basins keep big leaks under control in warehouses.
Occupational Limits: Agencies like OSHA and NIOSH have set recommended exposure limits. The Permissible Exposure Limit for Dioctylphthalate commonly stands at 5 mg/m3 for an 8-hour time weighted average.
Engineering Controls: Local exhaust ventilation, fume hoods, or enclosed transfer lines cut back airborne concentrations.
Personal Protection: Nitrile gloves, safety goggles, long-sleeved clothing, and, if airborne vapor gets high, half-mask respirators with organic vapor cartridges. Workers should receive training on proper personal protective equipment use and how to decontaminate after exposure.
Hygiene Steps: Washing hands and forearms thoroughly before eating or drinking and after handling the material curbs accidental ingestion.
State: Clear, oily liquid at room temperature
Melting Point: -46°C
Boiling Point: About 386°C at 760 mmHg
Flash Point: Ranges from 213–227°C, depending on purity
Solubility: Insoluble in water, mixes well with most common organic solvents
Density: About 0.98 g/cm3 at 20°C
Vapor Pressure: Low, under standard conditions
Odor Threshold: Noticeable at high concentrations
Viscosity: Thick compared to water, which explains the slow spreading during spills
Status: Dioctylphthalate holds up well in ordinary storage. Browning or breakdown usually reflects long-term sunlight exposure or extreme heating.
Hazardous Reactions: Strong acids or bases, powerful oxidizers like nitric acid or chromates, can trigger breakdown that gives off toxic fumes and smoke.
Byproducts: High heat decomposition leads to release of phthalic anhydride, carbon monoxide, and smaller hydrocarbons.
Polymerization: Not known to polymerize on its own.
Acute Effects: Swallowing or inhaling large quantities can make you nauseated or cause diarrhea, dizziness, or headaches. Short-term skin or eye exposure typically irritates but rarely leads to severe damage.
Chronic Effects: Years of research point toward hormone and reproductive system impacts. Kidney and liver damage surfaced in animal studies but is rare in documented workplace exposure with proper safety controls.
Cancer Status: The International Agency for Research on Cancer lists Dioctylphthalate as possibly carcinogenic to humans, though the link remains less clear at normal environmental exposure levels.
Sensitivity: Some allergic reactions show up in people who handle the material daily, but these tend to be mild skin rashes or irritation.
Environmental Impact: Dioctylphthalate lingers for years in sediment and soil. It moves up the food chain and concentrates in fish and birds. Aquarium studies have shown that the chemical disrupts endocrine systems at levels found in polluted waterways.
Degradation: Sunlight and soil bacteria eventually break it down, but the process moves slowly. Once in groundwater, removal becomes much more difficult.
Wildlife Danger: Algae, invertebrates, and some fish suffer stunted growth or reproductive problems, triggering concern for fisheries and natural habitats sharing water with point sources of discharge.
Green Alternatives: Research continues into safer plasticizers, but changing manufacturing at scale still faces resistance from cost and performance constraints.
Disposal Options: Any contaminated absorbents, clothing, or equipment should be treated as hazardous waste. Specialized facilities incinerate the material at high temperatures to destroy the chemical fully. Landfills may accept small quantities only after solidification and approval.
Rules: National and local laws dictate reporting and transport for hazardous waste, which means proper documentation, labeling, and manifest tracking.
Reuse: Reclaiming and recycling Dioctylphthalate is rare due to the risk of contamination and long-term safety concerns.
UN Number: Typically not classified as dangerous for carriage under most regulations,
Packing Group: Not usually assigned for routine shipments
Labeling: “Environmentally hazardous” warnings often appear on bulk shipments. Most shipments need tight-sealing drums or containers that keep contents from spilling out during transport.
Spill Response: Written instructions for drivers and handlers help everyone act fast during accidents. Communication with local authorities matters if highways or populated areas stand near the transport route.
Global Rules: Dioctylphthalate faces restricted uses in children’s toys and consumer goods in the United States, Canada, and most of Europe. The EU’s REACH program lists it as a substance of very high concern.
Labeling and Disclosure: Most regions demand clear warning labels for containers and place workplace air monitoring rules to limit exposure. Safety Data Sheets are required by law in manufacturing, storage, and shipping sites.
Worker Protection: Labor and public health agencies regulate exposure through industrial hygiene standards and inspect companies for compliance. Community Right to Know laws give residents and emergency responders access to information on nearby storage sites.
Alternatives and Substitution: Companies may phase out Dioctylphthalate where possible, using bio-based or less toxic plasticizers. Market pressure from large buyers and regulators provides an incentive for switching to safer options over time.
