n-Heptane
- C7H16
- CAS Number 142-82-5
- UN1206 (gas)
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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
Gas Phase
In standard conditions (1.013 bar, 15°C)
Physical Properties
Molecule phase diagram showing the transition phases between solid, liquid and gas as a function of temperature and pressure
-
- 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 |
Applications
Examples of uses of this molecule in Industry and Healthcare
Safety & 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.
Learn More
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".