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Chemical Name: Methylcyclohexanol
Chemical Family: Cycloalkanols
Common Uses: Solvent, intermediate in pharmaceutical and fragrance production, sometimes found in plasticizers and pesticides
Appearance: Colorless to pale yellow liquid, distinct odor reminiscent of menthol and hydrocarbons
Molecular Formula: C7H14O
CAS Number: 25639-42-3
State: Liquid under normal conditions
Odor Threshold: Detected at relatively low concentrations due to a strong, penetrating smell
Synonyms: 1-Methylcyclohexanol, para-Methylcyclohexanol, mixed isomers
Solubility: Moderately soluble in water, fully miscible in many organic solvents
Main Risks: Flammable liquid, irritating to eyes, skin, and respiratory tract, may cause dizziness or drowsiness if inhaled at higher levels
Chronic Exposure: Prolonged, repeated skin contact can lead to dermatitis
Inhalation: Vapors may aggravate respiratory conditions
Ingestion: Nausea, headache, and abdominal pain are common; larger amounts can depress the central nervous system
OSHA Classification: Recognized as hazardous under the OSHA Hazard Communication Standard
NFPA Ratings: Health: 2, Flammability: 2, Reactivity: 0
Environmental Hazards: Hazardous to aquatic life if released in significant amounts
Main Component: Methylcyclohexanol (typically over 98%)
Isomers: 2-Methylcyclohexanol, 3-Methylcyclohexanol, 4-Methylcyclohexanol—all vary slightly in physical and toxicological properties
Common Impurities: Trace cyclohexanol, cyclohexanone
Purity: Technical grade and higher usually offer high purity with minimal contaminants
Eye Contact: Rinse carefully with water for several minutes, seek medical attention if irritation continues
Skin Contact: Remove contaminated clothing, wash thoroughly with soap and water, pay attention to persistent redness or rash
Inhalation: Move outdoors or to fresh air, observe for coughing or labored breathing, see a doctor if symptoms persist
Ingestion: Do not induce vomiting, rinse mouth, seek medical attention immediately, especially if quantity was significant
Experience: Prompt, thorough rinsing and getting fresh air work wonders for mild exposures, but medical backup should always be nearby if symptoms escalate
Suitable Extinguishing Media: Carbon dioxide, dry chemical, foam, avoid using water in jet form
Special Hazards: Vapors can form explosive mixtures with air, closed containers may rupture if heated
Protective Equipment: Full firefighting gear, self-contained breathing apparatus
Combustion By-Products: Can release hazardous gases like carbon monoxide and carbon dioxide
Firefighting Strategy: Cool containers with plenty of water spray, keep away from run-off and drains
Lessons Learned: Most chemical fires that escalate quickly result from overlooked vapor hazards, not just open flames
Spill Response: Evacuate area, ventilate well, eliminate all ignition sources
Personal Protection: Wear gloves, goggles, chemical resistant clothing
Containment: Use inert absorbent material such as sand or earth
Disposal: Collect residue for disposal in accordance with local regulations
Environmental Precaution: Prevent entry into drains, waterways, or soil
Cleanup Insight: Early containment cuts spread, shrinks cleanup, and limits health risk—once vapors hit the air, headaches and irritation become noticeable within minutes
Handling Guidance: Work in well-ventilated areas, avoid contact with eyes and skin, keep away from sparks and open flame
Storage Conditions: Store in cool, dry, well-ventilated spaces, tightly closed containers, keep away from incompatible materials like strong oxidizers
Bulk Storage: Use grounded containers to avoid static discharge
Labeling: Always label containers clearly to prevent mix-ups
Personal Responsibility: Handlers who respect PPE and don’t try shortcuts see fewer accidents and less downtime
Engineering Controls: Local exhaust ventilation, fume hoods in enclosed spaces
Respiratory Protection: Respirators for high vapor areas or during spill cleanup
Eye Protection: Chemical-resistant goggles or face shield
Skin Protection: Impermeable gloves, long sleeves, lab coats
Workplace Practices: Wash hands after handling, keep food and drink away from work area
Monitoring: Regular air quality checks keep surprises at bay, especially in older labs using open containers
Appearance: Clear to pale yellow viscous liquid
Odor: Strong, sweet, menthol-like
Boiling Point: Approximately 170 – 180 °C (varies with isomer)
Melting Point: Ranges from -10 to 33 °C depending on isomer
Flash Point: 77 °C (closed cup), raises flammability concerns
Vapor Density: Heavier than air, can accumulate in low spots
Solubility: Moderate in water; freely mixes with alcohol, ether, and most organic solvents
Viscosity: Noticeably thicker than water
Other Info: Easily mistaken for less hazardous alcohols—always double-check labelling before use
Chemical Stability: Stable under normal temperatures and pressures, sensitive to strong acids and oxidizers
Conditions to Avoid: Open flames, high heat, source of static electricity
Incompatibility: Strong oxidizing agents like chromates and peroxides
Decomposition: Hazardous fumes under fire or strong acid/base conditions
Lived Experience: Most spills come from people refilling containers near heat sources or not grounding for static—small mistakes, large risks
Routes of Entry: Absorption through skin, inhalation of vapors, accidental ingestion
Acute Symptoms: Eye irritation, stinging, skin redness, dizziness, drowsiness, cough, nausea
Chronic Effects: Skin dryness and cracking, possible effects on liver with heavy or repeated exposures
LD50: Moderately toxic by oral and dermal routes in animal studies
Long-Term: No solid evidence for carcinogenicity, mutagenicity, or reproductive toxicity in humans
Personal Take: Minor exposures mostly irritate, but complacency can lead to cumulative problems—vigilance and education make all the difference
Aquatic Toxicity: Harmful to fish and invertebrates at high concentrations
Persistence: Moderately persistent; slowly broken down by microorganisms
Bioaccumulation: Not expected to build up in typical environmental conditions
Wastewater Impact: Keep out of sewer systems to protect local water supplies
Practical Experience: Proper disposal and secondary containment protect both wildlife and neighbors, especially near sensitive streams and lakes
Best Methods: Incinerate at licensed facility under controlled conditions, solids can go to hazardous waste landfill if allowed
Do Not: Pour into sinks, storm drains, or natural bodies of water
Lab Practice: Bottle up residues, label properly, schedule regular hazardous waste pickups
Waste Minimization: Only purchase and open what you can use—unused surplus leads to more headaches and disposal costs
Shipping Name: Methylcyclohexanol
Hazard Class: Flammable liquid (classification may differ by region)
Packing Group: III or as required by regulations
Labeling: Flammable liquid, keep upright, avoid impact
Special Considerations: Inspect containers for leaks or damage before and after transit
Firsthand Lesson: Secure closures, clear labels, and driver training avoid most transport mishaps—most spills stem from loose caps or knocked-over drums
OSHA: Covered under Hazard Communication Standard
EPA: Listed as hazardous according to certain federal and state laws when in waste streams
TSCA: Listed in Toxic Substances Control Act Inventory
Workplace Exposure Limit: Not always formally established, but typical safe levels follow general alcohol exposure guidelines
Other Regulations: International trade and movement may require proper hazard documentation and permits
