n-Pentane is a simple organic compound belonging to the alkane family. It has the chemical formula C5H12 and a straight-chain structure, CH3–CH2–CH2–CH2–CH3. The two terminal carbon atoms each carry three hydrogen atoms, while the three internal carbon atoms each carry two. n-Pentane is one of the three structural isomers of pentane, alongside isopentane and neopentane, which have more branched structures.
n-Pentane is a colorless liquid at room temperature and atmospheric pressure, with a characteristic gasoline-like odor. It is highly flammable and volatile, meaning that it evaporates readily and its vapors can ignite easily. It is practically insoluble in water but soluble in many organic solvents. With a boiling point of approximately 36°C and a melting point of approximately −130°C, it is suitable for applications requiring rapid evaporation or low-temperature performance.
Solvent and Industrial Applications
n-Pentane is used as a solvent, a physical blowing agent, and a component of petroleum-derived fuels. As a solvent, it can dissolve nonpolar substances such as oils, fats, and waxes, making it useful in extraction and chemical processing.
Different applications require different purity levels. n-Pentane, 99% is available for laboratory, chromatography, precision extraction, and specialty solvent applications where tighter impurity control is important. For general industrial solvent use and foam production, n-Pentane, 95% offers an alternative for bulk industrial requirements.
One of the main industrial applications of n-Pentane is as a physical blowing agent in foam production. Its low boiling point allows it to vaporize during processing, helping create the cellular structure of the foam. It is used in expandable polystyrene (EPS) and in selected polyurethane (PU) foam formulations.
For EPS production, n-Pentane / Isopentane Blends combine the two pentane isomers in different proportions to meet specific processing requirements. The available range includes standard n-pentane/isopentane ratios from 10/90 to 90/10.
Related options for PU foam applications include Cyclopentane / n-Pentane Blends and Cyclopentane / Isopentane Blends. These are separate product families from the n-pentane/isopentane blends offered for EPS applications.
Health, Environmental, and Safety Considerations
Although n-Pentane is useful in many industrial processes, it requires careful handling. Exposure to high vapor concentrations can cause symptoms such as headache, dizziness, drowsiness, nausea, and impaired coordination. Its high flammability also creates a significant fire hazard, particularly where vapors can accumulate.
n-Pentane should be stored in a cool, well-ventilated area away from heat, sparks, open flames, and other ignition sources. Containers should remain tightly closed, and handling procedures should follow the applicable Safety Data Sheet (SDS) and local regulations. Spills and waste should be managed appropriately to prevent uncontrolled release into the environment.