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Product Name: Dichloromethane carries a reputation as a volatile, colorless liquid and falls into the organic solvent category, often called methylene chloride. Chemical Formula: CH2Cl2. Common Uses: Laboratories rely on it for high-performance liquid chromatography (HPLC), cleaning applications, and extraction processes. Appearance: Its clarity and volatility might obscure its dangerous side. Odor: The chloroform-like smell is strong enough to alarm trained noses.
Main Hazards: Breathing in fumes brings on drowsiness, dizziness, and headaches. Prolonged exposure can strike at the liver and central nervous system. Fire Hazard: Flammable atmospheres may arise quickly even though it resists catching fire under normal lab conditions. Contact Risk: It bites on skin and stings in eyes. Long-Term Risk: Prolonged or repeated contact may link to cancer, which makes proper handling vital. HMIS Ratings: Health: 2, Flammability: 1, Reactivity: 0 (may vary by source).
Main Ingredient: Dichloromethane at over 99%. Chemical Family: Halogenated hydrocarbon. CAS Number: 75-09-2. There are no notable impurities reported in analytical grade forms used for HPLC procedures. Its purity is a reminder that even a single chemical can cause a range of hazards when mishandled.
Inhalation: Rapid removal from exposure space, fresh air access, and monitoring for trouble breathing top the list. Skin Contact: Remove contaminated clothing, wash the skin with soap and water—a lab sink becomes a first defense. Eye Contact: Flood the eye with running water for at least 15 minutes, using an eyewash station if available. Ingestion: Medical help is needed without trying to induce vomiting. Everyone’s seen shocked faces around the emergency shower—you don’t forget it. Speed changes everything in these situations.
Suitable Extinguishing Media: Carbon dioxide, dry chemical powder, or foam. Fire Risk: Low risk of ignition, but decomposition can foster hazardous fumes like hydrogen chloride and phosgene. Protective Measures: Full firefighting gear and a supplied-air respirator make sense in smoky, vapor-rich situations. Special Notes: Water sprays help cool containers but spreading solvent pools with water causes bigger problems.
Personal Protection: Well-fitted gloves and goggles shield skin and eyes. Proper ventilation, such as a fume hood or open doors, slashes vapor buildup risk. Containment: Granular absorbents such as vermiculite or sand make cleanup easier. Clean-Up Procedure: Sweeping up material for waste disposal inside sealed, labeled containers. Avoidance: Any accidental release in a poorly ventilated room ramps up exposure risk.
Storage Conditions: Cool, dry locations away from direct sunlight and compatible chemicals put the mind at ease. Handling: Only open bottles in well-ventilated rooms or under a fume hood—no exceptions. Incompatibilities: High reactivity with strong oxidizers and active metals can lead to intense reaction or decomposition. Transport: Keep containers tightly closed and label them clearly. Even slight carelessness here brings big consequences.
Workplace Ventilation: Properly functioning fume hoods take priority for anyone working with volatile solvents. Adequate room air exchanges limit vapor accumulations. Protective Equipment: Well-sealed splash goggles, chemical-resistant gloves, and lab coats become standard regardless of experience level. Respiratory Protection: If vapor levels climb unexpectedly, cartridge respirators rated for organic vapors or supplied-air units keep lungs protected. Hygiene: Hand washing after handling prevents unintentional contact later in the day.
Appearance: A colorless, transparent liquid that catches the eye only through smell. Boiling Point: About 40°C (104°F), which means leaving it open to air works against good practice in every lab. Solubility: Miscible with many organic solvents but only slightly soluble in water. Density: Around 1.33 g/cm³—heavier than water. Vapor Pressure: High vapor pressure brings fast evaporation, adding to inhalation risk. Molecular Weight: 84.93 g/mol. Flash Point: None detectable (closed cup)—still, care is warranted.
Chemical Stability: Stable under recommended storage conditions, but heat or exposure to incompatible substances drives breakdown. Decomposition: Heat, ultraviolet light, or reaction with strong bases releases hazardous gases like phosgene, hydrogen chloride, and carbon monoxide. Reactive Incompatibilities: Avoid contact with aluminum, potassium, or sodium, plus potent oxidizers. Open flames or hot surfaces only add danger.
Routes of Entry: Vapor inhalation trumps all others for rapid onset of symptoms. Skin contact also absorbs a portion, so gloves are non-negotiable. Symptoms of Exposure: Headaches, dizziness, sleepiness, coughing, and nausea emerge quickly with high vapor. Long-term, liver and central nervous system damage may follow. Carcinogenicity: IARC classifies dichloromethane as possibly carcinogenic. Regular users at the bench care about these findings. Acute Toxicity: Short exposure stuns judgment and may trigger unconsciousness in high doses.
Aquatic Impact: Toxic to aquatic life, especially fish and invertebrates, if released in significant quantities. Persistence: Dichloromethane evaporates from water surfaces rapidly, but it can still cause harm before it dilutes. Air: The vapor doesn't last long in the atmosphere, as sunlight breaks it down into safer compounds over days, not weeks. Soil: Little soil mobility, but what does migrate may harm local organisms before it dissipates.
Waste Classification: Treated as hazardous waste under most local and federal guidelines. Recommended Disposal: Collect in tightly sealed, clearly marked containers for licensed hazardous waste handlers to incinerate or treat per local law. Lab Habits: Never pour leftovers down any drain. Mixing with incompatible wastes spells disaster. Regular compliance checks catch common mistakes before regulators do.
UN Number: Dichloromethane receives a hazardous classification for shipping and transport staff take special handling classes to get this right. Transport Labels: Toxic and environmentally hazardous substance labels ensure clarity at all points. Regulatory Guidance: Shipping the wrong way exposes organizations to fines and creates unnecessary danger on the road and in storage.
Workplace Regulations: OSHA, EU REACH, and similar frameworks restrict exposure to safe levels, insisting on monitoring and reporting for regular users. Environmental Controls: EPA and regional agencies lock down against accidental releases, so every organization keeps good records and training updated. HazCom: Clear labeling, safety training, and consistent updates on legislation form a strong backbone against unintentional exposure or release. Laboratories who skip diligence here find themselves facing steep penalties and internal risk.
