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Chemical Name: 1,3-Butanediol CAS Number: 107-88-0 Aliases: Butane-1,3-diol Appearance: Colorless liquid Odor: Sweet-ish, faint Uses: Intermediate in plastics, solvents, flavors Personal experience in chemical stocks shows most bottles arrive tightly sealed, barcoded, and flash a familiar warning to not treat them as just another glycol. Once you’ve had one bottle’s top off, that faintly sweet vapor lingers, and it’s clear you’re not handling just some household alcohol.
GHS Classification: Not officially classified as hazardous, but may cause irritation to eyes and skin Acute Health Hazards: Eye redness, mild skin discomfort Signal Word: None required by GHS standards Long-Term Hazards: Data suggests little chronic toxicity, though inhaling large volumes of vapor or mist leads to coughing or drowsiness Direct handling always gets my hands itchy unless gloves are on. Policy is to keep away from eyes and try not to breathe in deep near pouring lines. Incidents aren’t dramatic, but mistakes easily leave the skin singing or eyes watering.
Component: 1,3-Butanediol Concentration: 98% or higher Impurities: 2% water or trace glycols in technical grades Mixing isn’t typical, so you’re almost always dealing with a single-ingredient bulk liquid. No surprise formulas. That simplification keeps risk management focused.
Eye Contact: Rinse cautiously with water for several minutes Skin Contact: Wash with plenty of soap and water Inhalation: Move to fresh air if feeling dizzy Ingestion: Rinse mouth, seek medical help if large amounts are consumed On the bench, small splashes demand fast, almost reflexive rinses in the eye wash or under tap water. You learn quick about irritants—no one likes running to the safety shower, but those happen if you skip gloves.
Suitable Extinguishing Media: Alcohol-resistant foam, dry chemical, carbon dioxide Fire Hazards: Vapors form combustible mixtures with air above 96°C Additional Info: Expect toxic fumes under fire conditions Hot plates and open flames in labs always carry that tension—this isn’t as volatile as diethyl ether, but at high temps, vapors do combust. Several fire drills centered on glycol flammability show why you never cut corners when storing around ignition sources.
Personal Precautions: Wear gloves and safety goggles Environmental Precautions: Prevent spills from reaching drains and sewers Cleanup Methods: Absorb with inert material and dispose according to local regs Remembering the day a one-liter bottle cracked made it clear—containment depends on quick action. Nothing feels routine about scrambling for soda ash and squeegees, especially aware that sewers aren’t the place for these liquids.
Handling: Keep containers tightly closed; avoid inhaling vapors; use only with adequate ventilation Storage: Store in a cool, dry, well-ventilated area away from oxidizers In real life, storage rules get debated but always end up strict—good ventilation and no crowded shelves. Rooms used by my team flagged for glycols got extra airflow and well-marked shelves. If you cut corners and let bottles sit warm or open, stuff gets sticky, stinky, and riskier.
Exposure Limits: None officially published Engineering Controls: Fume hood or local exhaust recommended Personal Protection: Nitrile gloves, safety goggles, lab coats Monitoring: Not standard, but some sites use VOC meters Wearing gloves becomes as automatic as grabbing a pen. Some think fume hoods are overkill, but air feels cleaner, headaches fewer. A shared sense of security in solid PPE, regardless of hyped-up formal limits, keeps everyone at ease.
Physical State: Liquid Color: Clear, colorless Odor: Faintly sweet Melting Point: -50°C Boiling Point: About 205°C Density: 1.004 g/cm³ at 25°C Solubility: Completely miscible with water Vapor Pressure: Very low at room temp In a lab, the stuff pours like syrup, refuses to freeze in any real cold, and stubbornly resists boiling off. That slow-bubbling property makes it both useful on the benchtop and annoying to clean up.
Chemical Stability: Stable under normal conditions Incompatible Materials: Strong oxidizers, acids Hazardous Decomposition: Carbon monoxide, carbon dioxide under burning Mixing with acids leads to messes and sometimes releases pungent fumes. Accidents are rare but memorable—storage far away from nitric or sulfuric acids became a no-brainer in our group.
Acute Oral Toxicity: Moderate (LD50 in rats about 16 g/kg) Inhalation: Little hazard at room temp Skin/Eye: May cause mild irritation Long-Term Exposure: No known carcinogenicity After reading up, it’s clear issues come from drinking or splashing—not from faint exposure. It’s still not wise to treat it like water, especially with small kids around or on shared equipment.
Biodegradability: Readily biodegradable Aquatic Toxicity: Low toxicity reported for fish and algae Persistence: Does not bioaccumulate Community labs tend to worry more about accidental releases than long-term ecosystem harm. Piping out down the sink is never sanctioned, especially with municipal wastewater rules getting tighter every year.
Waste Handling: Dispose as hazardous chemical waste Disposal Methods: Incinerate or send to licensed treatment facilities Special Notes: Do not pour down household drains or into sewers Once municipal authorities made it clear: glycol drains straight to water supplies if unchecked, so labeling every container and keeping disposal logs becomes a habit.
UN Number: Not classified as hazardous for transport Packing: Sealed containers, well-cushioned, upright Shipping: No special hazard class used for ground transport Getting shipments isn’t stressful for staff, which keeps breakage rare, though our experience saw damaged packaging infrequently causing more paperwork and cleanup than immediate danger.
Regulation: Present on chemical inventory lists (US TSCA, EU REACH) Labeling: No specific hazard label mandates Workplace Rules: Standard safeguards as with other glycols My deep dive into compliance found most oversight just matches standard glycol rules, but successful laboratory safety strikes the balance between regulatory compliance and actual hands-on vigilance.
