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Chemical Name: Heptabromodiphenyl Ether
Common Use: Used in flame retardant applications by industries working with electronics, textiles, plastics, and foam.
Appearance: Fine white to off-white powder. Not noticeably volatile at room temperature.
Odor: Very faint, sometimes practically odorless.
Solubility: Does not dissolve well in water. Tends to linger in soil and sediments when released.
CAS Number: 36483-60-0
Molecular Formula: C12H3Br7O
Classification: Regarded as hazardous based on toxicity data. Suspected developmental toxin. Persistent Organic Pollutant (POP) as cited under the Stockholm Convention.
Routes of Exposure: Inhalation of dust, skin contact, ingestion through contaminated hands or environments.
Potential Health Effects: May affect thyroid and liver function in repeated or high exposures. Children may face high risk due to sensitivity and contaminated household dust.
Physical Hazards: No explosive risk documented, but fine powder can form a dust cloud causing respiratory tract irritation.
Environmental Impact: Bioaccumulation in wildlife and long-term persistence pose a threat to aquatic and terrestrial organisms.
Heptabromodiphenyl Ether Content: Contains up to 100% PBDE congener mixture focused on the hepta isomer.
Related Contaminants: Technical grade usually mixes with other polybrominated diphenyl ethers, like penta and octa forms in smaller amounts.
Impurities: Trace levels of brominated dibenzofurans have been observed in technical product runs.
Inhalation: Go outside for fresh air. Respiratory symptoms may need medical assessment; persistent coughing warrants a medical check.
Skin Contact: Remove exposed clothing. Wash skin thoroughly with soap and water. Watch out for rashes or irritation.
Eye Contact: Rinse thoroughly with water. Remove contacts if safe and easy. Seek further help if pain or irritation doesn't fade.
Ingestion: Rinse mouth with water. Seek immediate care—swallowing even small amounts can be risky.
Medical Attention: Doctors handle exposure symptomatically—there’s no known antidote.
Suitable Extinguishing Media: Use water spray, foam, CO2, or dry chemical as needed around other burning materials.
Hazardous Decomposition Products: Fumes may release hydrogen bromide, carbon monoxide, carbon dioxide, and potentially dioxins.
Protective Measures: Firefighters wear full protective gear and a self-contained breathing apparatus. Runoff water should not enter drains and watercourses.
Special Considerations: Thermal breakdown can be toxic. Stay upwind to avoid inhaling fumes.
Spill Response: Wear proper protection—gloves, goggles, dust mask or respirator. Avoid producing airborne dust.
Containment: Scoop up material. Place into a secure, sealable container for disposal.
Environmental Precautions: Do not allow product or dust to enter the environment—soil, drains, or waterways.
Clean-up: Use wet methods or HEPA-filter vacuum for residue. Avoid sweeping which stirs up dust.
Handling: Use only with proper ventilation. Handle in ways to avoid producing dust clouds. Wear gloves to avoid skin contact.
Storage: Store in a cool, dry, well-ventilated spot, sealed tightly and away from sunlight. Keep far from strong oxidizers, acids, and incompatible chemicals.
Precautions: Keep containers clearly labeled. Limit access to trained handlers only.
Engineering Controls: Local exhaust and dust extraction work well in reducing airborne concentrations.
Respiratory Protection: If dust levels rise above safe limits, a particulate respirator becomes necessary.
Eye Protection: Safety goggles or face shield recommended.
Skin Protection: Gloves, lab coat or apron for routine handling.
Hygiene: Wash hands and face thoroughly after handling and before eating, drinking, or smoking.
Occupational Limits: No OSHA or ACGIH exposure limits established for this specific compound, but general dust exposure limits apply.
Form: Crystalline or powdery solid.
Melting Point: Varies by isomer, typically above 125°C.
Boiling Point: Decomposes on heating.
Solubility: Practically insoluble in water, more soluble in organic solvents.
Vapor Pressure: Very low at room temperature.
Stability in Sunlight: Tends to persist without breaking down quickly.
Odor Threshold: Not established due to faint odor.
Chemical Stability: Stable in bulk at room temperature.
Incompatibilities: Strong acids and bases, oxidizing agents can break down the substance.
Decomposition: Heat, flame, or strong UV causes release of toxic fumes, especially brominated dioxins.
Polymerization: Not known to self-react or polymerize.
Corrosiveness: Negligible in normal handling scenarios.
Acute Toxicity: Considered low for single exposures but repeated or prolonged exposures raise bigger concerns.
Chronic Effects: Animal studies link long-term exposure to changes in the liver and endocrine system. Evidence raises red flags for human health due to persistent, accumulative traits.
Sensitization: May cause skin or respiratory irritation, regular contact raises sensitivity.
Mutagenicity and Carcinogenicity: Research flags developmental and neurodevelopmental risks; data on cancer risk remains incomplete but suggests caution.
Special Populations: Pregnant women, children, and those with compromised thyroid function face higher risk.
Environmental Persistence: Lingers for years in soil, sediment, and water. Doesn’t break down easily.
Bioaccumulation: Builds up in fish, aquatic animals, predators—high levels have been found in Arctic mammals, birds, and global food webs.
Toxicity to Wildlife: Harms reproductive and thyroid function in mammals, birds, and amphibians.
Mobility: Moderately mobile in the environment, mostly sticks to particles that settle out of water.
Long-Term Risks: Ongoing contamination from legacy use remains a challenge for regulators and scientists.
Waste Handling: Treat this substance as hazardous waste—never throw down the drain, into soil, or in regular trash.
Destruction: High-temperature incineration at approved facilities is safest. Landfilling risks leaching, so not favored.
Environmental Law: Regulations often restrict use and disposal in many countries, with international controls pushing for phase-out and better safeguards.
UN Classification: Not routinely assigned a hazard number unless mixed with more dangerous chemicals.
Packing Requirements: Secure, sealed containers marked for hazardous substances in shipment.
Regulated Routes: Many locations require specific labeling, documentation, and restricted routes for large volumes.
Spill Response During Transport: Teams handling transport spills must use protective equipment. Road, port, and rail agencies usually have extra guidance.
Regulatory Status: Covered under major safety and environmental laws in North America, Europe, and Asia. Stockholm Convention gives global framework on PBDEs; many forms banned or heavily restricted.
Labeling Rules: Hazard communication requires clear warning about the reproductive and developmental effects, fire and explosion risk remains comparatively low.
Worker Protection: Employers in many industries must offer training, PPE, exposure monitoring, and medical surveillance.
Public Health Consideration: Environmental agencies monitor PBDEs in ecosystems and food supplies, with ongoing efforts to reduce legacy contamination.
