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Chemical Name: 4-Chloro-1-Butanol
Synonyms: 4-Chlorobutanol, 1-Butanol, 4-chloro-
CAS Number: 928-51-8
Experts know this colorless to pale yellow liquid by its faint, pungent odor and persistent greasy feel. In my experience working with specialty chemicals, a compound’s identification goes beyond a technical label—a clear name and number help reduce mix-ups in busy labs or workshops. Accidental substitution can escalate risk quickly, especially with chemicals that react unpredictably with others in storage.
Acute Hazards: Causes serious eye and skin irritation; moderate respiratory irritant when inhaled
Long-Term Hazards: Potential to damage central nervous system or liver after prolonged exposure
Flammability: May burn but not easily ignited under normal conditions
Anyone who’s opened a bottle of this stuff without knowing the risks learns quickly why hazard labels and signage matter. Skin tingling or redness from a single splash shows just how crucial it is to keep unnecessary contact at bay. Even after years of handling lab solvents, folks often underestimate the cumulative effects low-level exposure causes over time, and forgetting that has ended a few researchers’ careers early.
Main Ingredient: 4-Chloro-1-Butanol (C4H9ClO), concentration above 95% in technical and laboratory grades
Impurities hover around 2% or less, with minor chlorinated byproducts or residual water present during manufacturing. Even these residue levels can shape the hazards chemists and custodians face; small percentages go a long way with potent chemicals.
Inhalation: Move person to fresh air, keep at rest; seek immediate medical care if symptoms like coughing or dizziness persist
Skin Contact: Wash with generous amounts of water and soap; remove contaminated clothing to halt absorption
Eye Contact: Rinse eyes thoroughly with water for several minutes; medical evaluation is wise if burning or redness continues
Ingestion: Rinse mouth, do not induce vomiting; consult a toxicology professional quickly
Even small exposure can make throats or skin sting. During one of my first internships, I watched a co-worker ignore a spill, only to end up red-faced and breathless. It reinforced how delays in rinsing and reporting make situations spiral. Quick action and open communication matter just as much as any fancy equipment.
Suitable Extinguishing Media: Foam, dry powder, carbon dioxide
Specific Hazards: Emits corrosive fumes (hydrogen chloride among them) when burning
Protective Equipment: Full protective suit and self-contained breathing apparatus recommended for responders
If you’ve ever witnessed a chemical fire, panic spreads fastest when folks don’t recognize which extinguishers to grab. Using water on the wrong burning solvent has made fires worse—preparation and clear procedures, drummed into every safety briefing, pay off here.
Personal Precautions: Evacuate non-essential personnel; secure area and ventilate
Spill Containment: Absorb with inert material (like sand); collect residues for disposal
Environmental Precautions: Prevent runoff into drains or soil
Spills inside poorly ventilated labs put folks at risk for headaches and worse. I once saw a minor leak swell into a cleanup nightmare after someone tried mopping it up with rags. Absorbents work better and reduce skin contact. Quick reporting keeps small problems from turning into full-scale evacuations.
Handling: Always wear gloves, splash goggles, lab coat; avoid breathing vapors or eating near work areas
Storage: Keep in cool, well-ventilated spaces; use containers designed for organic chemicals with tight seals
Shortcuts invite trouble. People who prop open lids or leave bottles unlabeled endanger others without thinking twice. In chaotic workspaces, everybody benefits from putting safety gear at arm’s reach and labelling the heck out of everything. Simple habits form the foundation of real safety.
Engineering Controls: Fume hoods or local exhaust ventilation needed
Hand Protection: Chemical-resistant gloves (nitrile or neoprene work well)
Eye Protection: Safety goggles
Skin and Body Protection: Lab coat or apron, closed footwear
Respiratory Protection: Organic vapor respirator if ventilation isn't available
Working late one night, I ran out of gloves and foolishly kept handling glassware. It didn’t take long for my hands to itch; since then, running out of PPE means pausing the job, not pressing on. Well-designed ventilation and investing in spare gear save health, time, and money every season.
Form: Liquid
Color: Colorless to pale yellow
Odor: Pungent, slightly sweet
Melting Point: Near -30°C
Boiling Point: Around 174°C
Solubility: Miscible with most organic solvents, moderately soluble in water
Physical properties set expectations about handling; a high boiling point reveals it won’t evaporate quickly, but a low melting point means leaks stay liquid even in cold rooms. Folk wisdom says: know your chemical’s behavior before you ever open the cap. That way, you’re not surprised by a slippery floor or unexpected fumes.
Chemical Stability: Stable in sealed containers under recommended storage
Incompatible Materials: Strong oxidizers, acids, bases
Possibility of Hazardous Reactions: Violent reactions possible with incompatible materials, releases toxic gases when decomposed
Every chemist dreads accidental mixing. A colleague once stored this alcohol near an open acid cabinet—a careless decision that resulted in awkward calls to facility management. Keeping records, double-checking labels, and reviewing compatibility charts makes sure that minor forgetfulness doesn't lead to hazardous events.
Routes of Exposure: Skin, eyes, inhalation, ingestion
Acute Effects: Severe irritation, nausea, respiratory distress, potential damage to mucous membranes
Chronic Effects: Evidence points to liver and central nervous system toxicity with repeated exposure
Toxicology doesn’t just concern full-time researchers. Custodians, students, and lab visitors suffer most from chronic low-level exposure. Eyes opened after a friend’s odd headaches were traced back to trace chemical vapor; what you don’t see or smell still packs a punch. Long-term studies urge regular training and, above all, a culture where people feel free to speak up if they feel off.
Aquatic Toxicity: Harmful to fish and aquatic life in moderate concentrations
Persistence and Degradability: Not truly persistent but can linger long enough to cause environmental harm
Bioaccumulation: Low potential reported but not enough data exists
Disposal mistakes spill out of labs and into streams. My own area saw two fish die-offs linked to improper chemical dumping. Teaching staff about environmental risk and auditing disposal routes pays dividends for public health and a clean conscience. One careless pour can ruin a small ecosystem.
Methods: Incinerate at licensed chemical waste facility; never pour down drain
Packaging: Use UN-approved containers, label as hazardous
Most people who cut corners with chemical disposal never see the fallout. I remember a lab veteran who recycled solvent bottles instead of using waste containers; the discovery ended in a slap on the wrist, but the risk to sanitation workers was real. Following waste rules protects essential workers and the wider environment; shortcuts aren't worth the small savings.
UN Number: 2810 (toxic liquid, organic, n.o.s.)
Transport Hazard Class: 6.1
Packing Group: III (moderate hazard)
Long commutes with hazardous packages mean extra vigilance. I’ve seen bottles bounce in the back of university vans on rough roads; secure strapping and secondary containment convert risky cargoes into routine shipments. Every driver and handler deserves clear labels and upfront training for emergencies, not just a line on a manifest.
Applicable Laws: Regulated as a toxic chemical in many regions
Labeling Requirements: Signal words (DANGER), hazard pictograms on all primary containers
Worker Protections: Strict exposure limits and regular medical monitoring in some jurisdictions
Too many assume regulators just produce paperwork. Real inspections catch lapses before someone gets hurt. Regular reviews and updates—it all adds a layer of protection that can make the difference between safety and serious incidents. I encourage teams to see these requirements not as burdens, but as shared responsibility for keeping friends and coworkers out of harm’s way.
