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Chemical Name: 1,2-Dimethoxyethane
Synonyms: Glyme, Ethylene Glycol Dimethyl Ether
CAS Number: 110-71-4
Molecular Formula: C4H10O2
Appearance: Clear, colorless liquid with a slightly sweet smell
Uses: Often appears as a solvent in labs, battery electrolytes, and high-tech manufacturing because it dissolves both ionic and organic compounds. Each time I’ve come across it, its low viscosity and high volatility made it a go-to in organometallic syntheses or during tricky separations in chromatography. These traits also signal to keep a sharp eye out—ease of handling can sometimes hide real dangers.
GHS Classification: Flammable liquid (Category 2), Harmful through inhalation, ingestion, and skin absorption, Reproductive toxicity (Category 1B)
Hazard Statements: Highly flammable, risk of serious health effects, eye and skin irritation, possible reproductive harm. This stuff evaporates in a flash and its vapors can build up before you realize it, especially without solid ventilation.
Physical Hazards: Vapor forms explosive mixtures; static discharge can spark a fire.
Health Hazards: Headaches, drowsiness, dizziness, even narcosis if concentration climbs. It is a reminder that what you can’t see can, in fact, be the biggest hazard in the room.
Environmental Hazards: Potential for groundwater and aquatic toxicity. I’ve seen peers struggle with appropriate disposal, as traces readily move through soil and water, complicating cleanup.
Ingredient: 1,2-Dimethoxyethane
Concentration: Typically above 99% in lab-grade samples
Impurities: Trace glycol ethers possible, depending on manufacturing quality, though reputable suppliers reduce these risks with rigorous QC testing.
Inhalation: Move to fresh air. Serious reactions call for oxygen or medical attention. Even in my own teaching years, I’ve seen students suddenly become short of breath if they spent a little too long pipetting.
Skin Contact: Wash thoroughly with soap and water. Remove contaminated clothing.
Eye Contact: Rinse under gentle flowing water for at least 15 minutes. Get checked by a doctor.
Ingestion: Rinse mouth. Never induce vomiting. Call for help straight away; the risk of central nervous system depression is real, based on animal studies and human case reports.
Suitable Extinguishers: Alcohol-resistant foam, carbon dioxide, dry powder.
Specific Hazards: Gives off toxic gases like carbon monoxide and formaldehyde during a fire.
Protective Equipment: Full turnout gear plus SCBA required for responders.
Firefighting Tactics: Use water spray to cool containers but avoid direct water jets. I remember one incident in a university lab—a small spill vaporized, floated to an ignition source, and flames shot up to the ceiling tiles. Only quick work with the right extinguisher prevented a disaster.
Personal Precautions: Evacuate non-essential staff, provide adequate ventilation, avoid breathing the mists or vapors.
Spill Response: Absorb with non-combustible materials like sand or vermiculite. Shovel into suitable container for disposal.
Environmental Precautions: Don’t let this get into drains or public waterways—cleanup must follow strict procedures. Having participated in post-spill investigations, it’s clear the sooner teams act, the less groundwater trouble later.
Handling: Use only in fume hoods or with local exhaust. Keep away from sparks, open flames, heat.
Storage: Store in tightly sealed containers, in cool, well-ventilated areas, away from incompatible chemicals like oxidizers or strong acids.
Special Advice: Ground and bond containers during transfer. Over the years, a recurring lesson has been that static discharge from poorly bonded containers can ignite vapors in a split second.
Engineering Controls: Strong, consistent ventilation—local exhaust best for small lab spaces.
Personal Protective Equipment: Nitrile gloves, chemical splash goggles, flame-resistant lab coats.
Respiratory Protection: NIOSH-approved respirators where airborne levels go above safe workplace thresholds.
Work Practices: No eating, drinking, or smoking in work area—seems obvious, but lapses still happen all too often, turning a minor risk into major exposure.
Appearance: Clear, colorless liquid
Odor: Mild, ether-like
Boiling Point: About 85°C
Melting Point: -58°C
Vapor Pressure: High at room temperature
Density: Around 0.87 g/cm³
Solubility: Fully miscible with water
Flash Point: Approximately 3°C (closed cup)
Explosive Limits: Lower 1.5%, Upper 16% by volume in air
Viscosity: Low, which means it spreads quickly if spilled, making containment a challenge.
Chemical Stability: Stable under normal storage but breaks down under heat or light.
Reactivity: Reacts violently with oxidizers—peroxides can build over time in partly used bottles.
Conditions to Avoid: Open flame, hot surfaces, static discharge.
Incompatible Materials: Chlorine, nitric acid, other strong oxidizers.
Hazardous Decomposition: Fires or decomposition can release carbon monoxide, carbon dioxide, and traces of formaldehyde.
Acute Effects: Drowsiness, dizziness, nausea, narcosis with high vapor concentration. Skin contact can dry or redden exposed areas.
Chronic Effects: Reproductive toxicity seen in animal models, which is why regulatory agencies warn against prolonged, unprotected exposure.
Exposure Routes: Inhalation, skin absorption, mouth.
Symptoms of Overexposure: Nausea, fatigue, headaches, confusion, respiratory irritation.
Long-Term Risks: Industry workers may see problems with kidney, liver functions, reproductive health over time. Evidence gathered from chemical plant case studies shows these risks are more than statistical outliers.
Aquatic Toxicity: Harmful to aquatic life; movement in groundwater presents ongoing risks.
Persistence and Degradability: Degrades in environment, but persistence varies by location and concentration.
Bioaccumulation: Low bioaccumulation expected in wildlife, but wastewater treatment facilities lack robust methods for removal.
Soil Mobility: Moves readily through soil, threatening drinking water if spills go unchecked.
Precautions: Good lab practice means not letting a drop go to the sink—collect all waste, label, and dispose properly, every time.
Disposal Methods: Send for incineration through licensed chemical waste companies—landfill is never appropriate.
Container Disposal: Triple rinse, deface labels, and puncture before disposal as hazardous waste.
Hazardous Waste Number: Regulated as hazardous under EPA and similar agencies.
Best Practices: Never pour this down the drain—local water treatment cannot cope. Having spent time consulting with environmental health teams, I’ve seen the headaches mismanaged disposal creates for both the facility and the surrounding ecosystem.
UN Number: 1165
Transport Hazard Class: 3 (flammable liquid)
Packing Group: II
Environmental Hazards in Transit: Flammable, risk of spillage, emergency response plans needed for road, rail, sea. Shipments require compliant labeling and documentation.
Precautions: Secured, vented packaging; emergency info supplied to handlers. I’ve watched shipments delayed due to small mistakes in paperwork—regulatory compliance isn’t just bureaucracy, it’s how transit accidents get avoided.
Classified as Hazardous: By OSHA, EU REACH, and other agencies
Workplace Exposure Limits: Vary by country, often around 25 ppm over 8 hours
Additional Labeling: GHS symbols for flammability and toxicity must feature on all containers.
SARA, TSCA, REACH: All maintain strict reporting and recordkeeping—failure to comply leads to enforcement actions, penalties, and reputational headaches.
Worker Training: Annual hazardous chemical training and awareness policies required, reflecting the fact that repeated exposure incidents come from knowledge gaps more than equipment failures.
