Relative Permittivity - Dielectric Constant

Some common materials and relative permittivity

The dielectric constant - also called the relative permittivity - indicates how easily a material can become polarized by imposition of an electric field on an insulator.

Relative permittivity - ε - is the ratio of the permittivity of a substance to the permittivity of free space or vacuum. 

Relative permittivity for some common materials are indicated below:

MaterialDielectric Constant
- εr -
Acetaldehyde (41° F) 21.8
Acetic Acid (68° F) 6.2
Acetic Acid (36° F) 4.1
Acetone (77° F) 20.7
Acetone (127° F) 17.7
Acetone (32° F) 1.0159
Acetyl Acetone (68° F) 23.1
Acetyl Bromide (68° F) 16.5
Acetyl Chloride (68° F) 15.8
Acetyle Acetone (68° F) 25.0
Acetylene (32° F) 1.0217
Air (Dry) (68° F) 1.000536
Air, Liquid (-191oC) 1.4
Alcohol, Industrial 16-31
Alumina 9.3-11.5
Aluminum Bromide (212° F) 3.4
Aluminum Fluoride 2.2
Amber 2.8-2.9
Ammonia (-74° F) 25
Ammonia (-30° F) 22.0
Ammonia (40° F) 18.9
Ammonia (69° F) 16.5
Aniline (32° F) 7.8
Aniline (68° F) 7.3
Aniline (212° F) 5.5
Araldite 3.6
Argon (68° F) 1.000513
Bakelite 3.5-5.0
Benzene (68° F) 2.3
Butane (30° F) 1.4
Carbondioxide (68° F) 1.000921
Calcium 3.0
Casting compound 2.5
Caster oil 4.7
Chlorine (32° F) 2.0
Chloroform (68° F) 4.8
Ebonite 2.5-2.9
Epoxy Resin (Cast ) 3.6
Ethanol (77° F) 24.3
Ethyl Acetate (77° F) 6.0
Ethyl Alcohol (77° F) 24.3
Freon 12 (70° F) 2.4
Glass 3.7 - 10
Glycerin, Liquid 47-68
Glycerol (77° F) 42.5
Granite 7 - 9
Guttapercha 4
Hard paper, laminated 4.5
Ice (-2oC) 3.2
Isoprene (77° F) 2.1
Insulation of high voltage cables 4.2
Insulation of telephone cables 1.5
Marble 8
Mica 2.5 - 7
Mineral Oil (80° F) 2.1
Nitrogen (68° F) 1.000580
Nylon 4.0 - 5.0
Oil paper 4
Olive oil 3
Paper 2.3
Paper, impregnated 5
Paraffin oil 2.2
Paraffin Wax 2.1-2.5
Petroleum 2.2
Phenolic resin 8
Plexiglass 3.2
Polyester Resin 2.8 - 4.5
Polyethylene 2.2-2.4
Polyamide 2.8
Polypropylene 2.2
Polystyrene 3
Porcelain 5.0-7.0
Pressed board 4
Pyrex Glass 4.3 - 5.0
Quartz 4.5
Rubber 3.0
Salt 3.0 - 15.0
Shellac 3.5
Silica Sand 2.5-3.5
Silicon 11.0 - 12.0
Slate 4
Soft rubber 2.5
Steatite 6
Sulfur 3.5
Teflon, PTFE 2
Transformer oil, mineral 2.2
Transformer oil, vegetable 2.5
Turpentine 2.2
Vulcanized fibres 2.5
Water 4 - 88
Wood, Dry 2-6

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