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Common Name: P-Dichlorobenzene
Chemical Name: 1,4-Dichlorobenzene
CAS Number: 106-46-7
Appearance: White crystalline solid with a strong, distinctive odor that lingers.
Common Uses: Ingredient in mothballs, deodorizer for garbage and restrooms, sometimes in pest control products.
Potential Health Risks: Breathing in dust or fumes can cause headache, dizziness, irritation to nose and throat. Skin contact may trigger rash or redness, eyes may sting if particles make contact.
Environmental Concerns: This chemical is toxic to aquatic life. It doesn’t break down quickly in nature, so releases can build up over time and hurt wildlife.
Fire Hazard: Dust particles can catch fire in the air, making even a small spill risky in places where sparks fly or flames are present.
Main Component: 1,4-Dichlorobenzene forms the bulk of what’s found in mothballs and solid air fresheners sold for home and business use.
Concentration: Nearly pure in most consumer products, meaning safety warnings shouldn’t be ignored.
Inhalation: Get into fresh air right away. People feeling dizzy or short of breath after breathing fumes should seek help without delay.
Skin Contact: Wash with plenty of water and mild soap. Avoid rubbing skin raw. Remove any contaminated clothing.
Eye Contact: Rinse eyes gently but thoroughly with water, holding eyelids open for several minutes. Medical attention is best if irritation continues.
Ingestion: Spitting out or rinsing mouth helps, but calling for medical advice is always wise—never try to make someone vomit.
Suitable Extinguishing Media: Use dry chemical, carbon dioxide, or foam to knock down flames quickly.
Specific Dangers: Burning p-dichlorobenzene releases toxic fumes, including hydrogen chloride, which makes firefighting teams bring protective gear.
Precautions: Fire crews tackle blazes from upwind to avoid smoke and fumes.
Precautions for People: Wear gloves and goggles. Those cleaning up should avoid breathing dust and keep unnecessary folks out of the area.
Clean-Up Methods: Scoop spilled crystals into a sealed container. Sweep traces using wet methods to avoid raising more dust. Try to avoid letting product scatter or wash into drains.
Environmental Protection: Don’t let spillages reach soil, water, or storm sewers. Even small spills can build up in the environment.
Handling: Keep containers closed tight. Use with good ventilation. Don’t eat, drink, or smoke around this chemical.
Storage: Store in a cool, dry, well-ventilated space. Avoid direct sunlight and any ignition sources. Lock storage where kids or pets can’t get in.
Ventilation: Open windows, use exhaust fans, or work outside if possible. Avoid breathing dust.
Personal Protection: Wear chemical-resistant gloves, goggles, and long sleeves. Respirators are necessary when ventilation can’t keep the air clear.
Exposure Limits: OSHA recommends limits for workplace air. Chronic exposure adds up, so even low levels should get respect.
Physical State: Solid
Color: White
Odor: Sharp, mothball-like
Melting Point: About 53°C (127°F)
Boiling Point: Around 174°C (345°F)
Vapor Pressure: Moderate at room temperature, so crystals can fill a room with vapors surprisingly fast.
Solubility: Doesn’t mix well with water, easier with organic solvents.
Chemical Stability: Stable when kept sealed and dry.
Conditions to Avoid: Open flames, strong oxidizers, high heat or direct sunlight.
Hazardous Products: Burns give off smoke and corrosive hydrogen chloride gas.
Routes of Entry: Fumes get inhaled, crystals touch skin, products sometimes get swallowed by kids or pets.
Short-Term Effects: Fumes irritate eyes, nose, throat. Headaches and nausea come up after short exposure.
Long-Term Effects: Prolonged or repeated exposure links with liver and kidney problems. Workers in plants handling p-dichlorobenzene show higher risks.
Suspected Carcinogen: Studies suggest there’s a cancer risk after long exposure, enough for some agencies to flag it for extra caution.
Aquatic Impact: Fish and small organisms suffer harm at very low concentrations.
Persistence: Breaks down slowly in soil and water, so contamination lingers.
Bioaccumulation: Builds up in the tissues of animals, moving up the food chain. Regular spills or dumping only increase the danger.
Safe Disposal: Material shouldn’t go down household drains or with regular trash. Use hazardous waste programs which accept toxic chemicals.
Container Management: Rinse empty containers thoroughly, treat rinse water as hazardous. Send to approved incinerators or waste sites. Don’t reuse containers for food or drink.
Transport Regulations: Many countries consider this substance regulated for road, rail, and sea. There are rules about labeling, packaging, and quantity per shipment.
Packing Instructions: Leak-proof, sealed containers made of material that doesn’t react with strong chemicals. Trucks and railcars keep the chemical away from food and animal feeds.
Agency Oversight: The US Environmental Protection Agency (EPA), Occupational Safety and Health Administration (OSHA), and international bodies regulate occupational exposure, labeling, and safe disposal.
Workplace Controls: Laws define how much p-dichlorobenzene can be present in the air on the job. Employers must provide information and protective gear, plus training on safe handling.
Consumer Sales: Some countries restrict or ban the use of mothballs containing this chemical indoors, citing risks to children and pets.
Labeling: Strict rules say products and containers must show hazard warnings and handling instructions.
