Heptane S

Cas Number


Other Names


The formula

H3C(CH2)5CH3 or C7H16


n-Heptane is the straight-chain alkane. When used as a test fuel component in anti-knock test engines, a 100% heptane fuel is the zero point of the octane rating scale (the 100 point is a 100% iso-octane). Octane number equates to the anti-knock qualities of a comparison mixture of heptane and isooctane which is expressed as the percentage of isooctane in heptane and is listed on pumps for gasoline (petrol) dispensed globally

Physical and Chemical Properties
Physical state and appearance Colourless liquid
Molar mass 100.21 g·mol−1
Odor Petrolic
Density 0.6795 g cm−3[3]
Melting Point −90.549[3] °C (−130.988 °F; 182.601 K)
Boiling point 98.38[3] °C (209.08 °F; 371.53 K)
Solubility in water 0.0003% (20 °C)[4]

1. HEPTANE S is widely applied in laboratories as a non-polar solvent. As a liquid, it is ideal for transport and storage. In the grease spot test, HEPTANE S is used to dissolve an oil spot to show the previous presence of organic compounds on a stained paper. This is done by shaking the stained paper in a HEPTANE S solution for about half a minute.

2. Aqueous bromine may be distinguished from aqueous iodine by its appearance after extraction into HEPTANE S . In water, both bromine and iodine appear brown. However, iodine turns purple when dissolved in HEPTANE S , whereas the bromine solution remains brown.

3. HEPTANE S is commercially available as mixed isomers for use in paints and coatings, as the rubber cement solvent "Bestine", the outdoor stove fuel "Powerfuel" by Primus, as pure n-HEPTANE S for research and development and pharmaceutical manufacturing and as a minor component of gasoline.