n-Heptane

C₇H₁₆
CAS Number 142-82-5
UN1206 (gas)

Molecule
Properties
Safety & Compatibility
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Liquid / Gas Volumes

Calculate the volume or mass of a quantity of gas or liquid

Liquid Phase

At boiling point at 1.013 bar

m³ (Volume)

kg (Mass)

Gas Phase

In standard conditions (1.013 bar, 15°C)

m³ (Volume)

kg (Mass)

Physical Properties

Download the set of data (XLS - 85.13 KB)

General Properties
Solid Phase
Liquid Phase
Gas Phase

Molecule phase diagram showing the transition phases between solid, liquid and gas as a function of temperature and pressure

Pressure (bar)

- Molar mass 100.202 g/mol
- Content in dry air /
Critical Point
- Temperature 267.05 °C
- Pressure 27.4 bar
- Density 234.12 kg/m³
Triple Point
- Temperature -90.60 °C
- Pressure 1.827E-6 bar

Pressure 1.013 bar

Latent heat of fusion (at melting point)	140.217 kJ/kg
Melting point	- 90.58 °C

Pressure 1.013 bar

Boiling point	98.38 °C
Latent heat of vaporization (at boiling point)	316.887 kJ/kg
Liquid density (at boiling point)	614.219 kg/m³

Pressure 1.013 bar

0 °C
15 °C
25 °C

Gas density (at boiling point)

3.47 kg/m³

Applications

Examples of uses of this molecule in Industry and Healthcare

Safety & Compatibility

Major Hazards
Material Compatibility

GHS02

Flammable

GHS08

Serious health hazard

GHS09

Hazardous to the environment

Autoignition Temperature, Flammability Limits & Flash Point

Europe (according to EN1839 for Limits and EN 14522 for autoignition temperature)

Autoignition temperature (Chemsafe)	220 °C
Lower flammability limit (IEC 80079-20-1)	0.84 vol%
Upper flammability limit (IEC 80079-20-1)	6.7 vol%

US (according to ASTM E681 for Limits and ASTM E659 for autoignition temperature)

Autoignition temperature (NFPA 325)	204 °C
Flash point (NPFA 325)	- 4 °C
Lower flammability limit (NFPA 325)	1.05 vol%
Upper flammability limit (NFPA 325)	6.7 vol%

Threshold of toxicity

ILV-8h EU (at Patm and 293.15 K)	2085 mg/m³ or 500 ppm
PEL USA OSHA (vol)	500 ppm
VLEP 8h France (at Patm and 293.15 K)	1668 mg/m³ or 400 ppm
VLEP CT France (at Patm and 293.15 K)	2085 mg/m³ or 500 ppm

Odor

Gasoline

Metals

Aluminium	No data
Brass	No data
Monel	No data
Copper	No data
Ferritic Steel	No data
Stainless steel	No data
Zinc	No data
Titanium	No data

Plastics

Polytetrafluoroethylene	No data
Polychlorotrifluoroethylene	No data
Polyvinylidene fluoride	No data
Polyvinyl chloride	No data
Ethylene tetrafluoroethylene	No data
Polycarbonate	No data
Polyamide	No data
Polypropylene	No data

Elastomers

Butyl (isobutene- isoprene) rubber	No data
Nitrile rubber	No data
Chloroprene	No data
Chlorofluorocarbons	No data
Silicone	No data
Perfluoroelastomers	No data
Fluoroelastomers	No data
Neoprene	No data
Polyurethane	No data
Ethylene-Propylene	No data

Lubricants

Hydrocarbon based lubricant	No data
Fluorocarbon based lubricant	No data

Materials compatibility

Recommendations : Air Liquide has gathered data on the compatibility of gases with materials to assist you in evaluating which materials to use for a gas system. Although the information has been compiled from what Air Liquide believes are reliable sources (International Standards: Compatibility of cylinder and valve materials with gas content; Part 1- Metallic materials: ISO11114-1 (March 2012), Part 2 - Non-metallic materials: ISO11114-2 (April 2013), it must be used with extreme caution and engineering judgement. No raw data such as these can cover all conditions of concentration, temperature, humidity, impurities and aeration. It is therefore recommended that this table is only used to identify possible materials for applications at high pressure and ambient temperature. Extensive investigation and testing under the specific conditions of use need to be carried out to validate a material selection for a given application. Contact the regional Air Liquide team for expertise service.

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More information

Heptane is one of the 9 isomers C7H16 or a derivative of these molecules that comprises 7 atoms of carbon. In greek, "ἑπτά" (epta) means "seven".