Hexane is a colorless, highly volatile, and flammable liquid hydrocarbon that quietly powers some of the largest manufacturing and food-processing industries in the world. From extracting cooking oil out of soybeans to formulating fast-drying adhesives and cleaning electronic components, n-hexane and hexane blends are the workhorse non-polar solvents of modern industry. For buyers sourcing hexane in bulk, understanding its grades, properties, and handling requirements is essential.
What Is Hexane?
Hexane is a six-carbon alkane (C6H14) — a straight-chain, saturated hydrocarbon belonging to the same family as propane, butane, and pentane. There are several structural isomers of hexane, but the most commercially important is n-hexane, the straight-chain isomer. “Commercial hexane” typically refers to a fraction distilled from crude oil or natural gas condensate containing primarily n-hexane along with smaller amounts of methylcyclopentane, 3-methylpentane, and other C6 hydrocarbons.
Hexane’s combination of low boiling point, non-polar character, and chemical inertness makes it ideal as an extraction and reaction solvent — you can dissolve oils, waxes, and resins in it, then evaporate it cleanly to recover the target product.
Key Physical and Chemical Properties of Hexane
- Chemical formula: C6H14
- Molecular weight: 86.18 g/mol
- Appearance: Clear, colorless liquid
- Odor: Mild, gasoline-like
- Boiling point (n-hexane): 68.7 °C (155.7 °F)
- Melting point: -95 °C (-139 °F)
- Density: 0.659 g/cm³ at 20 °C
- Flash point: -22 °C (-7.6 °F) — extremely flammable
- Autoignition temperature: 225 °C (437 °F)
- Vapor pressure: 17.6 kPa at 20 °C
- Solubility in water: Practically insoluble (~9.5 mg/L)
- Dipole moment: ~0 D (non-polar)
Hexane is lighter than water and floats. Its vapors are heavier than air and can travel along the ground to ignition sources, which is why static control, grounding, and ventilation are non-negotiable when handling it.
Major Industrial Uses of Hexane
1. Vegetable Oil and Botanical Extraction
By volume, the single largest use of hexane worldwide is the extraction of edible oils from oilseeds — soybeans, canola, sunflower, cottonseed, peanut, and corn germ. Hexane selectively dissolves the oil from crushed seeds; the solution is then heated to evaporate the hexane, leaving behind crude vegetable oil. The recovered hexane is condensed and reused. Hexane is also used to extract botanical oils, flavors, and active ingredients in pharmaceutical and nutraceutical manufacturing.
2. Adhesives, Sealants, and Coatings
Hexane is a primary solvent in fast-drying contact cements, rubber cements, leatherworking adhesives, footwear adhesives, and many spray formulations. Its low boiling point lets adhesives tack quickly without long drying times.
3. Industrial and Electronic Cleaning
Hexane removes greases, oils, waxes, and tars from metal parts, circuit boards, and tooling. It evaporates cleanly without residue, making it useful in precision cleaning operations and as a degreaser in manufacturing lines.
4. Laboratory Solvent and Reaction Medium
In chemistry labs, hexane is the non-polar solvent of choice for column chromatography, recrystallization, and as a reaction medium where water-sensitive chemistry must run in a strictly non-polar environment. HPLC-grade and reagent-grade hexane are specified for analytical work.
5. Polymerization and Polyolefin Production
Hexane is used as a reaction medium and diluent in the manufacture of polyethylene and polypropylene, particularly in slurry-phase polymerization processes.
Hexane Grades and Specifications
- Commercial / Technical Hexane — typically 50–80% n-hexane with other C6 isomers; the workhorse grade for oil extraction and adhesives.
- Food Grade (Extraction Solvent) Hexane — meets FDA 21 CFR 173.270 specifications for use in vegetable oil extraction, with controlled benzene and aromatic content.
- n-Hexane 95%+ — higher-purity grade used where consistent solvent behavior is required.
- HPLC Grade / Spectroscopic Grade — >99% n-hexane with very low UV absorbance and residue, for chromatography and instrumental analysis.
- ACS Reagent Grade — meets American Chemical Society purity specifications for laboratory use.
Specifying the correct grade matters. Food-grade hexane in adhesives is a waste of money; commercial hexane in HPLC will destroy your column and your data.
Health, Safety, and Regulatory Notes
Hexane is more than just flammable — chronic inhalation exposure is a documented neurotoxin. The metabolite 2,5-hexanedione damages peripheral nerves, causing the classic “hexane neuropathy” — numbness, weakness, and motor deficits in the hands and feet that develop after months of exposure. Acute inhalation can cause dizziness, headache, nausea, and CNS depression.
- OSHA PEL: 500 ppm (8-hour TWA) — currently under review, with NIOSH recommending 50 ppm.
- ACGIH TLV: 50 ppm (8-hour TWA).
- Flammability: Class IB flammable liquid (NFPA). Extremely flammable; vapors form explosive mixtures with air.
- Hazard pictograms: GHS02 (flammable), GHS07 (irritant), GHS08 (health hazard), GHS09 (aquatic toxicity).
Storage and Handling
- Store in tightly closed, properly labeled containers in a cool, well-ventilated, fire-rated area away from oxidizers and ignition sources.
- Ground and bond all transfer equipment — hexane readily accumulates static electricity during transfer.
- Use local exhaust ventilation; install vapor monitors and explosion-proof electrical equipment in storage and dispensing areas.
- Provide chemical-resistant gloves (Viton, nitrile for short contact), splash goggles, and respiratory protection where vapors may exceed exposure limits.
- Use dry chemical, CO2, alcohol-resistant foam, or water spray for fire suppression. Straight water streams will spread a hexane fire.
- Hexane is a marine pollutant and DOT Hazard Class 3 (Flammable Liquid), UN1208 — ship and store per hazmat regulations.
Buying Hexane in Bulk
RightPath Industries supplies hexane in drums, totes, and tanker quantities, with documentation, COAs, and grade-specific spec sheets included. When evaluating a hexane supplier, confirm the following before placing an order:
- Exact grade and isomer breakdown (n-hexane content, aromatic content, benzene level).
- Certificate of Analysis tied to each lot.
- Packaging options (drum, IDC tote, tanker) and lead time.
- DOT/IMDG hazmat shipping documentation and emergency response support.
- Recovery/recycle program availability if your process generates spent hexane.
Key Takeaways
- Hexane (C6H14) is a non-polar, highly flammable C6 hydrocarbon — the workhorse extraction and cleaning solvent for vegetable oil, adhesives, electronics cleaning, and lab work.
- Commercial vs. food-grade vs. HPLC-grade hexane differ significantly in purity and price; match the grade to your application.
- Hexane is acutely flammable and chronically neurotoxic. Treat exposure limits, ventilation, and grounding as non-negotiable.
- Bulk hexane ships as DOT Hazard Class 3 UN1208 and requires proper hazmat documentation and emergency response planning.
- Sourcing decisions should focus on grade specification, lot-level COAs, and recovery/recycle support — not just unit price.
RightPath Industries supplies bulk hexane and a broad range of industrial solvents, glycols, and specialty chemicals. Contact our team for quotes, specs, and lead times.