n-heptane is a colorless, volatile liquid with a low boiling point and mild odor. It's a non-polar solvent with high volatility and low solubility in water.n-heptane is a very good solvent for non-polar substances, fats and oils. Especially in the pharmaceutical industry, it is used as an inert solvent, for purification, recrystallization and washing of active pharmaceutical ingredients (API).