Neopentane

C₅H₁₂
CAS Number 463-82-1
UN2044 (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 - 74.85 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 72.149 g/mol
- Content in dry air /
Critical Point
- Temperature 160.65 °C
- Pressure 31.96 bar
- Density 235.01 kg/m³
Triple Point
- Temperature -16.55 °C
- Pressure 3.54E-1 bar

Pressure 1.013 bar

Latent heat of fusion (at melting point)	43.6 kJ/kg
Melting point	- 16.55 °C

Pressure 1.013 bar

Boiling point	9.5 °C
Latent heat of vaporization (at boiling point)	315.692 kJ/kg
Liquid density (at boiling point)	601.172 kg/m³

Pressure 1.013 bar

0 °C
15 °C
25 °C

Gas density (at boiling point)	3.255 kg/m³
Vapor pressure	7.117E-1 bar

Compressibility factor Z	9.5839E-1
Cp/Cv ratio γ	1.0919
Gas density	3.1839 kg/m³
Gas/(liquid at boiling point) equivalent	188.87 vol/vol
Heat capacity Cp	1.6695 kJ/(kg.K)
Heat capacity Cv	1.529 kJ/(kg.K)
Specific volume	3.141E-1 m³/kg
Thermal conductivity	15.525 mW/(m.K)
Vapor pressure	1.231 bar
Viscosity	7.0232E-5 Po

Compressibility factor Z	9.6308E-1
Cp/Cv ratio γ	1.0869
Gas density	3.0621 kg/m³
Gas/(liquid at boiling point) equivalent	196.38 vol/vol
Heat capacity Cp	1.7147 kJ/(kg.K)
Heat capacity Cv	1.5777 kJ/(kg.K)
Specific volume	3.266E-1 m³/kg
Thermal conductivity	16.528 mW/(m.K)
Vapor pressure	1.715 bar
Viscosity	7.2589E-5 Po

Applications

Examples of uses of this molecule in Industry and Healthcare

Safety & Compatibility

Major Hazards
Material Compatibility

GHS02

Flammable

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)	450 °C
Lower flammability limit (IEC 80079-20-1)	1.3 vol%
Upper flammability limit (IEC 80079-20-1)	7.5 vol%

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

Autoignition temperature (NFPA 325)	450 °C
Lower flammability limit (NFPA 325)	1.4 vol%
Upper flammability limit (NFPA 325)	7.5 vol%

Threshold of toxicity

ILV-8h EU (at Patm and 293.15 K)	3000 mg/m³ or 1000 ppm
VLEP 8h France (at Patm and 293.15 K)	3000 mg/m³ or 1000 ppm

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	Satisfactory
Polychlorotrifluoroethylene	Satisfactory
Polyvinylidene fluoride	Satisfactory
Polyvinyl chloride	Satisfactory
Ethylene tetrafluoroethylene	No data
Polycarbonate	No data
Polyamide	Satisfactory
Polypropylene	significant swelling Not recommended

Elastomers

Butyl (isobutene- isoprene) rubber	significant swelling Not recommended
Nitrile rubber	Satisfactory
Chloroprene	Satisfactory
Chlorofluorocarbons	No data
Silicone	significant swelling Not recommended
Perfluoroelastomers	Satisfactory
Fluoroelastomers	Satisfactory
Neoprene	No data
Polyurethane	No data
Ethylene-Propylene	significant swelling Not recommended

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

Neopentane, also called 2,2-dimethylpropane, is a double-branched-chain alkane with five carbon atoms. Neopentane is an extremely flammable gas at room temperature and pressure which can condense into a highly volatile liquid on a cold day, in an ice bath, or when compressed to a higher pressure.