Dielectric Constant of some common Liquids
Common fluids and their dielectric constant or permittivity
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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 liquids and fluids are indicated in the table below:
| Fluid | Temperature (oF) |
Dielectric Constant - k - |
| Acetic Acid | 68 | 6.2 |
| Acetone | 77 | 20.7 |
| Alcohol, ethyl (ethanol) | 77 | 24.3 |
| Alcohol, methyl (methanol) | 68 | 33.1 |
| Alcohol, propyl | 68 | 21.8 |
| Ammonia (aqua) | 68 | 16.5 |
| Aniline | 68 | 7.3 |
| Benzene | 68 | 2.3 |
| Bromine | 68 | 3.1 |
| Butane | 30 | 1.4 |
| Caproic acid | 160 | 2.6 |
| Carbon disulfide | 2.64 | |
| Carbon tetrachloride | 68 | 2.23 |
| Castor Oil | 60 | 4.7 |
| Chlorine | 32 | 2.0 |
| Chloroform | 68 | 4.8 |
| Cotton seed oil | 3.1 | |
| Cresol | 63 | 10.6 |
| Cumene | 68 | 2.4 |
| Decane | 68 | 2.0 |
| Dodecane | 68 | 2.0 |
| Ether | 68 | 4.3 |
| Ethylamine | 70 | 6.3 |
| Ethylene glycol | 68 | 37.0 |
| Fluorine (freon) refrigerant R-11 | 77 | 2.0 |
| Fluorine refrigerant R-12 | 77 | 2.0 |
| Fluorine refrigerant R-22 | 77 | 2.0 |
| Furan | 77 | 3.0 |
| Furfural | 68 | 42.0 |
| Gasoline | 70 | 2.0 |
| Glycerine | 47-68 | |
| Glycerol | 77 | 42.5 |
| Heptane | 68 | 1.9 |
| Hexane | -130 | 2.0 |
| Hexanol | 77 | 13.3 |
| Hydrazine | 68 | 52.0 |
| Jet fuel | 70 | 1.7 |
| Kerosene | 70 | 1.8 |
| Linoleic Acid | 32 | 2.6-2.9 |
| Linseed Oil | 3.2-3.5 | |
| Mercury | 298 | 1.00074 |
| Methane | -280 | 1.7 |
| Napthalene | 68 | 2.5 |
| Octane | 68 | 2.0 |
| Olive Oil | 68 | 3.1 |
| Oxygen | -315 | 1.51 |
| Palmitic Acid | 160 | 2.3 |
| Pentane | 68 | 1.8 |
| Phenol | 50 | 4.3 |
| Phosgene | 32 | 4.7 |
| Pinene | 68 | 2.7 |
| Propane | 32 | 1.6 |
| Propylene | 11.9 | |
| 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 | |
| Turpentine (wood) | 68 | 2.2 |
| Water | 68 | 80.4 |
Typical dielectric values for some common plastic materials are indicated below:
| Plastic Material | Dielectric Constant |
| 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 |
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