Dielectric Constants of common Liquids

Common fluids and dielectric constants or permittivities

The Dielectric Constant, or permittivity - ε - is a dimensionless constant that indicates how easy a material can be polarized by imposition of an electric field on an insulating material. The constant is

  • the ratio between the actual material ability to carry an alternating current to the ability of vacuum to carry the current

The dielectric constant can be expressed as

ε = εs / ε0                                                       (1)

where

ε = the dielectric constant

εs = the static permittivity of the material

ε0 = vacuum permittivity

The Dielectric Constant of common fluids are indicated in the table below. The Dielectric Constant is in general influenced by 

  • temperature
  • moisture levels
  • electrical frequency
  • part thickness
FluidTemperature
(oF)
Dielectric Constant
ε -
Acetal 77 3.8
Acetaldehyde 15
Acetamide 170 59.2
Acetic Acid 68 6.2
Acetone 77 20.7
Acetophenone 18
Acetyl bromid 16.2
Acetyl chloride 15.9
Acetylacetone 23
Acetylene dibromide 7.2
Acetylene tetrabromide 5.6
Aconite acid ester 6.3
Adipic Acid 1.8
Aerosile 1.0
Aether 4.0
Air (at STP, for 0.9 MHz)) 1.00058986 ± 0.00000050
Alcohol, allyl 20.6
Alcohol, cetyl 140 3.6
Alcohol, diacetone 18.2
Alcohol, ethyl (ethanol) 77 24.3
Alcohol, methyl (methanol) 68 33.1
Alcohol, propyl 68 21.8
Allyl chloride 8.2
Allyl iodide 6.1
Aluminum bromide 212 3.4
Ammonia 15
Ammonia solution 25% 31.6
Amyl amine 4.5
Aniline 68 7.3
Anisole 4.5
Antimony hydride 1.8
Argon 1.5
Arsine 2.1
Arsole 2.3
Azoxybenzene 97 5.2
Benzene 68 2.3
Bromine 68 3.1
Butane 30 1.4
Butanoic acid 3.0
Caproic acid 160 2.6
Caprylic acid 2.5
Carbon disulfide   2.64
Carbon tetrachloride 68 2.23
Castor Oil 60 4.7
Chlorine, chlor fluid 32 2.0
Chlor benzene 5.7
Chloroform 68 4.8
Coconut oil, refined 2.9
Cotton seed oil   3.1
Cresol 63 10.6
Cumene 68 2.4
Decane 68 2.0
Diesel oil, fuel 2.1
Dodecane 68 2.0
Ether 68 4.3
Ethylamine 70 6.3
Ethylene glycol 68 37.0
Fish oil 2.6
Fluorbenzene 6.4
Trichlorofluoromethane refrigerant R-11 77 2.0
Dichlorodifluoromethane refrigerant R-12 77 2.0
Chlorodifluoromethane refrigerant R-22 77 2.0
Furan 77 3.0
Furfural 68 42.0
Gasoline, gas 70 2.0
Glycerine   47-68
Glycerol 77 42.5
Glycerol water 37
Glycol 37
Heptane 68 1.9
Hexane -130 2.0
Hexanol 77 13.3
Hydrazine 68 52.0
Iodine 11.1
Isopropanol 18
Jet fuel 70 1.7
Kerosene 70 1.8
Linoleic Acid 32 2.6-2.9
Linseed Oil   3.2-3.5
Mercury (vapor) 298 1.00074
Methane -280 1.7
Napthalene 68 2.5
Octane 68 2.0
Oil 2
Olive Oil 68 3.1
Oxygen -315 1.51
Palmitic Acid 160 2.3
Palm seed oil 1.8
Paraffin 1.6
Pentane 68 1.8
Phenol 50 4.3
Pentanol 14.8
Phosgene 32 4.7
Phosphorus liquid 3.9
Pinene 68 2.7
Propane 32 1.6
Propanol, propyl alcohol 2.2
Propylene   11.9
Propylether 3.3
Pyridine 68 1.12
Resorcinol   3.2
Stearic Acid 160 2.3
Styrene 77 2.4
Terpinene 70 2.7
Toluene   2.0-2.4
Transformer oil 2.1
Turpentine (wood), white spirit 68 2.2
Vacuum (by definition) 1
Vinegar 24
Water 68 80.4
Water 680 10
Water, demineralised 29.3
Water, heavy 78.3
Water - oil emulsion 24
Wine 25

Typical dielectric values for some common plastic materials are indicated below:

Plastic MaterialDielectric Constant
ε -
Acetal 3.7 - 3.9
Acrylic 2.1 - 3.9
ABS 2.9 - 3.4
Nylon 6/6 3.1 - 8.3
Polycarbonate 2.9 - 3.8
Polyester, TP 3.0 - 4.5
Polypropylene 2.3 - 2.9
Polysulfone 2.7 - 3.8
PPO, Modified 2.4 - 3.1
Polyphenylene sulfide 2.9 - 4.5
Polyacrylate 2.6 - 3.1
Liquid Crystal 3.7 - 10

Related Topics

  • Material Properties - Material properties for gases, fluids and solids - densities, specific heats, viscosities and more

Related Documents

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