n-Hexane is a straight-chain alkane hydrocarbon solvent with chemical formula C6H14, molecular weight 86.18 g/mol, and CAS number 110-54-3. This colorless, volatile liquid with a characteristic hydrocarbon odor serves analytical laboratories, pharmaceutical testing, electronics manufacturing, and industrial extraction operations.

The solvent exists in multiple purity grades and forms. Grades range from ACS Reagent and HPLC (at least 95% to over 99.9% purity) through Technical/Industrial (85-95% purity), each targeting specific analytical, pharmaceutical, electronics, or industrial requirements. Forms split between pure n-hexane (the straight-chain isomer) and hexane mixtures containing multiple isomers and related C5-C7 alkanes.

This distinction between "n-Hexane" (singular, pure isomer) and "Hexanes" (plural, isomer mixture) matters significantly. Pure n-hexane delivers the highest specificity and reproducibility for precise analytical work. Hexane mixtures (typically 60%+ n-hexane content) cost less for extractions and general laboratory cleaning where exact isomer composition doesn't affect results.

Purity grade determines analytical reproducibility, regulatory compliance, and application suitability. ACS Reagent and HPLC grades provide Certificates of Analysis for analytical laboratories requiring reproducible results. HPLC-UV/Spectrophotometric grades optimize UV transparency with extremely low UV-absorbing impurities. USP grade meets United States Pharmacopeia analytical specifications for pharmaceutical testing. Semiconductor/Electronic grade provides ultra-high purity with minimal ionic and particulate contamination for cleanroom applications. Technical/Industrial grades offer cost-effective options for non-analytical applications.

Selection factors include: application type (analytical versus industrial), purity requirements, analytical reproducibility needs, UV transparency requirements, regulatory compliance (pharmaceutical testing), contamination sensitivity (electronics manufacturing), isomer specificity needs (pure n-hexane versus hexane mixture), and cost considerations.

Purity Grades & Standards

n-Hexane suppliers maintain distinct purity tiers, each addressing specific quality thresholds and documentation requirements.

ACS Reagent Grade

ACS Reagent grade achieves purity of at least 95%, typically reaching at least 99.9%. For hexane mixtures, specifications require at least 60% n-hexane content. This grade meets or exceeds American Chemical Society (ACS) specifications established for reagent chemicals.

Each batch ships with a Certificate of Analysis (COA) documenting compliance. This documentation guarantees ACS specification adherence, supporting laboratory quality programs and regulatory audits.

Analytical laboratories depend on ACS Reagent grade for chromatography, extraction procedures, and research requiring consistent, reproducible results. The controlled impurity profile ensures experimental outcomes reflect the system under study rather than solvent contamination.

HPLC Grade

HPLC grade surpasses 99.9% purity, with HPLC-specific formulations maintaining 95% n-hexane minimum. Manufacturing specifically targets High Performance Liquid Chromatography requirements, though HPLC grades typically also satisfy ACS reagent chemical specifications.

Low UV absorption characteristics prove critical for HPLC detection systems. Low residue and minimal impurities prevent interference with analytical separations. Low viscosity enables optimal flow through HPLC columns.

Chromatography applications, including HPLC analysis, liquid chromatography (LC), Ultra-High Performance Liquid Chromatography (UHPLC), analytical separations, and preparative separations, all deploy HPLC-grade. The specialized manufacturing justifies premium pricing for laboratories where chromatographic performance determines data quality.

HPLC-UV/Spectrophotometric Grade

HPLC-UV/Spectrophotometric grade exceeds 99.9% purity while optimizing UV transparency. Extremely low UV-absorbing impurities make this grade suitable for spectroscopy applications requiring UV detection.

UV-Visible spectrophotometry, spectroscopic analysis, and HPLC with UV detection demand this grade. Even trace UV-absorbing contaminants create false peaks or baseline drift that compromise analytical results. The additional purification removing UV-active impurities costs more but proves essential for UV-based detection methods.

USP Grade

USP grade satisfies analytical specifications of the United States Pharmacopeia. Purity exceeds 99.9%, often maintaining at least 60% n-hexane for hexane mixtures. This grade suits pharmaceutical analytical testing applications.

Pharmaceutical analysis, USP method testing, and drug analysis require USP grade for regulatory compliance. Pharmaceutical quality control laboratories use USP grade when testing methods specify it, ensuring results satisfy FDA expectations.

High Purity Grade

High-purity grade maintains 95% n-hexane minimum. This high-quality solvent serves specialized applications not demanding ACS specifications but requiring better quality than technical grades.

Extractions, general laboratory use, and cleaning operations benefit from High Purity grade's balance between quality and cost. Laboratories seeking good solvent performance without ACS certification overhead find High Purity grade economical.

Semiconductor/Electronic Grade

Semiconductor/Electronic grade achieves ultra-high purity for electronics manufacturing. Minimal ionic and particulate contamination distinguishes this grade. Controlled impurity specifications for critical applications prevent defects in semiconductor processing.

Semiconductor manufacturing, electronics cleaning, and cleanroom applications demand contamination levels measured in parts per billion. The extensive purification and testing required for Semiconductor/Electronic grade creates premium pricing justified by preventing expensive defects in electronic component production.

Technical/Industrial Grade

Technical/Industrial grade delivers 85-95% purity typically. Lower purity standards permit higher impurity levels and other alkane content. This cost-effective option serves non-analytical applications where trace impurities don't compromise function.

Industrial solvents, degreasers, extraction (non-food), and cleaning agents deploy Technical/Industrial grade. Large-volume industrial users achieve substantial savings versus reagent grades when analytical precision isn't required.

Lab Grade

Lab-grade maintains purity suitable for educational purposes. Lower purity than reagent grade, with exact impurity levels potentially unknown. This grade isn't suitable for food, drug, or analytical applications where precision matters.

Teaching laboratories, demonstrations, and preliminary experiments use lab-grade equipment. Educational budgets benefit from reduced costs when introducing students to laboratory techniques not requiring analytical-grade solvents.

Common Commercial Forms

Beyond purity grades, n-hexane appears in two distinct forms based on isomer composition.

n-Hexane (Pure)

Pure n-hexane contains only the straight-chain hexane isomer. Purity ranges from 95% to over 99.9% depending on grade. This form delivers the highest specificity and most reproducible results.

Precise analytical work and research requiring specific isomers demand pure n-hexane. When experimental procedures specify n-hexane or when reproducibility across laboratories matters, the pure form eliminates variability from changing isomer ratios.

Cost runs higher than hexane mixtures, but analytical applications justify this premium through enhanced reproducibility and method transferability.

Hexanes (Mixture)

Hexanes (plural) contain multiple hexane isomers, including n-hexane, 2-methylpentane, 3-methylpentane, and others. Mixtures also include smaller proportions of C5, C6, and C7 alkanes. Typical n-hexane content reaches 60%+ in high-grade mixtures.

Lower cost than pure n-hexane makes mixtures attractive for extractions, general laboratory cleaning, and industrial applications where exact isomer composition doesn't affect outcomes. The mixed isomers provide adequate solvent properties for many purposes at reduced expense.

Extraction procedures not requiring specific isomer ratios, general cleaning operations, and industrial processes commonly deploy hexane mixtures. Volume users achieve significant savings without compromising functional performance.

Physical & Chemical Properties

Physical Characteristics

n-Hexane appears as a clear, colorless liquid with a characteristic hydrocarbon odor. Density reaches 0.663 g/mL at 25°C typically. The boiling point measures 68.7°C for pure n-hexane, varying for hexane mixtures based on isomer composition.

Flash point of -23.00°C indicates a highly flammable character. This low flash point demands stringent fire prevention measures during storage and handling. Vapor pressure varies with temperature and composition, affecting evaporation rates and vapor exposure risks.

Chemical Properties

n-Hexane functions as an excellent solvent for nonpolar substances. Immiscible with water, it miscibly combines with most organic solvents. Highly volatile character enables rapid evaporation after use.

Chemical stability under normal conditions prevents unwanted reactions during storage. Non-corrosive to most metals, n-hexane works with standard laboratory and industrial equipment without special material requirements.

Applications by Type

Analytical Chemistry (ACS, HPLC, HPLC-UV Grades)

High Performance Liquid Chromatography (HPLC) and Ultra-High Performance Liquid Chromatography (UHPLC) rely on HPLC-grade mobile phase preparation. Gas chromatography applications employ ACS Reagent or HPLC grade. Spectrophotometry and UV-Visible analysis demand HPLC-UV grade for UV transparency.

Thin-layer chromatography, extraction procedures requiring high purity, calibration standards preparation, method validation and development, and quantitative and qualitative analysis all depend on these high-purity grades. Analytical reproducibility demands justify premium pricing for laboratories generating regulatory or research data.

Laboratory & Research (ACS, Reagent, High Purity Grades)

Organic synthesis operations deploy these grades as a non-polar solvent for reactions. Chemical extractions pull compounds from complex matrices. Recrystallization purifies compounds through controlled precipitation.

Equipment and glassware cleaning removes residues between experiments. Sample preparation incorporates n-hexane extracting analytes. Titrations occasionally employ it. Precise analytical procedures demand the reproducible solvent quality these grades provide.

Industrial & Extraction (Technical/Industrial Grade)

Seed and vegetable oil extraction operations identify n-hexane as the solvent of choice for edible oil extraction. The food industry accepts n-hexane specifically (not hexane mixtures) for this application based on safety evaluations and established practice.

Textiles manufacturing, glue formulations, and degreaser formulations deploy Technical/Industrial grade. Industrial cleaning applications, paint thinners, and adhesive removal benefit from cost-effective solvent properties. General-purpose industrial solvent applications consume large volumes, where Technical/Industrial grade provides adequate performance.

Electronics & Semiconductor (Semiconductor/Electronic Grade)

Semiconductor wafer cleaning demands ultra-pure solvents, preventing contamination affecting circuit function. Electronics component cleaning and printed circuit board (PCB) manufacturing require similar purity levels.

Cleanroom applications and precision electronics assembly use Semiconductor/Electronic grade exclusively. Removal of flux and residues from electronic assemblies prevents failures from contamination. The controlled ionic and particulate specifications justify premium costs through defect prevention.

Specialized Solvent Applications

Non-polar solvent requirements for water-sensitive processes favor n-hexane. Solvent applications for polymers and resins leverage their solubility characteristics. Extraction of natural products and purification processes benefit from its selective dissolving capabilities.

Regulatory & Safety Classifications

DOT Classification

Department of Transportation classifies n-hexane as UN1208, Hexanes, Class 3 (flammable liquid), Packing Group II. This classification triggers hazmat shipping protocols. Hazmat fees typically apply to shipments regardless of quantity or grade.

Shipping Restrictions

Shipping restrictions limit container sizes. Largest individual container via UPS/FedEx Ground reaches 20 L maximum. UPS Air permits only 1 L. FedEx Air allows 2.5 L (may vary by specific product). One-quart containers may qualify as "Limited Quantity" and bypass hazmat rules for ground shipping.

These restrictions complicate logistics. Ground shipping takes longer, and air service options face severe limitations. Procurement planning must account for extended delivery times.

Health & Safety Hazards

Highly flammable character (flash point -23°C) creates fire and explosion risks. Harmful if inhaled, with vapor inhalation causing central nervous system depression. May cause respiratory irritation.

Prolonged exposure may cause nerve damage — a serious chronic health concern for workers with repeated exposure. Skin irritant with prolonged contact. Eye irritant. Harmful to aquatic life, creating environmental hazards from spills or improper disposal.

Occupational Exposure Limits

OSHA PEL (Permissible Exposure Limit), NIOSH REL (Recommended Exposure Limit), and ACGIH TLV (Threshold Limit Value) establish exposure limits protecting workers. Compliance requires proper ventilation and personal protective equipment. Exposure monitoring may be required in occupational settings with regular n-hexane use.

How to Choose the Right Type

For Analytical Procedures and Research

Deploy ACS Reagent Grade. High purity requirements and reproducibility demands mandate ACS specifications. Documentation supporting quality programs and regulatory compliance justifies reagent-grade costs.

For Liquid Chromatography

Deploy HPLC Grade for mobile phase preparation and analytical separations. Low UV absorption ensures detection system performance. Minimal impurities prevent interference with separations.

For UV Detection and Spectrophotometry

Deploy HPLC-UV/Spectrophotometric Grade. UV-Visible analysis and applications requiring lowest UV-absorbing impurities for accurate detection demand this grade. UV transparency proves critical for baseline stability and peak detection.

For Pharmaceutical Analytical Testing

Deploy a USP Grade satisfying USP method compliance requirements. Pharmaceutical quality control and drug analysis demand pharmacopeial-grade solvents for regulatory acceptance.

For General Laboratory Work with Reasonable Purity Needs

Deploy High Purity (95%) Grade providing a good quality solvent without ACS specifications. Cost-effectiveness matters when ACS documentation isn't required but quality exceeding technical grade is desired.

For Electronics Manufacturing and Cleanrooms

Deploy Semiconductor/Electronic Grade. Ultra-low contamination requirements for semiconductor processing and precision cleaning justify premium costs through defect prevention.

For Industrial Applications and Large-Volume Use

Deploy Technical/Industrial Grade for industrial extractions (non-food), degreasing operations, and applications where cost is primary concern and high analytical purity isn't required.

For n-Hexane (Pure) vs. Hexanes (Mixture)

Deploy n-Hexane (pure) when analytical precision is required, a specific isomer is needed for reproducibility, research applications demand it, or method development specifies it.

Deploy Hexanes (mixture) when extraction efficiency matters more than isomer specificity, lower cost is a priority, general laboratory cleaning applications, industrial uses, and specific isomer composition isn't critical.

Storage & Handling

Storage Requirements

Store in tightly sealed containers compatible with hydrocarbons (glass, HDPE, metal). Maintain cool, well-ventilated storage areas. Keep away from heat, sparks, and open flames. Store away from oxidizing agents. Protect from direct sunlight. Ground containers during transfer to prevent static electricity buildup.

Safety Equipment & Personal Protective Equipment

Chemical-resistant gloves (nitrile recommended). Safety goggles or a face shield. Lab coat or protective clothing. Utilize well-ventilated areas or fume hoods. Respiratory protection if ventilation proves inadequate. Fire extinguisher readily available (Class B for flammable liquids). Grounding equipment for transfer operations.

Handling Precautions

Highly flammable character demands keeping away from all ignition sources. Use only non-sparking tools. Prevent vapor accumulation in work areas. Avoid breathing vapors or mist. Avoid skin and eye contact. Do not eat, drink, or smoke in work areas. Wash your hands thoroughly after handling. Deploy appropriate engineering controls (ventilation systems, fume hoods).

Spill Response

Eliminate all ignition sources immediately. Evacuate the area if necessary. Ventilate the area thoroughly. Contain spill preventing spread. Absorb with inert material (sand, vermiculite). Place in the appropriate waste container. Do not flush to the sewer. Follow institutional spill response procedures.

Environmental Considerations

Harmful to aquatic life. Do not release to the environment. Dispose of through a licensed waste disposal contractor. Follow local, state, and federal regulations for disposal.

Key Takeaways

n-Hexane exists in multiple purity grades spanning ACS Reagent and HPLC (at least 95% to over 99.9%) through Technical/Industrial (85-95%), each serving distinct analytical, pharmaceutical, electronics, or industrial requirements. Forms split between pure n-hexane (straight-chain isomer providing the highest specificity) and hexane mixtures (multiple isomers at lower cost).

ACS Reagent grade delivers reproducible results for analytical laboratories with Certificates of Analysis. HPLC grade optimizes chromatography performance. HPLC-UV/Spectrophotometric grade minimizes UV-absorbing impurities for spectroscopic work. USP grade satisfies pharmaceutical testing requirements. Semiconductor/Electronic grade achieves ultra-high purity for cleanroom applications. Technical/Industrial grade provides a cost-effective solvent for non-analytical uses.

Pure n-hexane suits precise analytical work requiring a specific isomer. Hexane mixtures (typically 60%+ n-hexane) offer economy for extractions and cleaning where isomer composition doesn't affect results.

Highly flammable character (flash point -23°C) demands strict fire prevention. Harmful if inhaled, with chronic exposure potentially causing nerve damage. Requires proper ventilation, personal protective equipment, and exposure monitoring. Shipping restrictions limit container sizes and create hazmat fees.

Selection depends on application type (analytical versus industrial), purity requirements, reproducibility needs, UV transparency demands, regulatory compliance requirements, contamination sensitivity, isomer specificity needs, and cost constraints. Partner with qualified suppliers providing appropriate grade certifications, Certificates of Analysis, and safety documentation.

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