where
ε r = relative permittivity - or dielectric constant
ε = p ermittivity of s ubstance (C 2 /(N m 2 ))
ε 0 = p ermittivity of vacuum or free space (8.854187817 10 -12 C 2 /(N m 2 ))
Relative permittivity - ε r - and permittivity - ε - for some substances. Note that permittivity may change with temperature for most materials.
Product | Relative Permittivity - ε r - 10 -12 |
---|---|
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 (-191 o C) | 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 |
Body tissue | 8 |
Butane (30° F) | 1.4 |
Carbon dioxide (68° F) | 1.000921 |
Carbon disulfide | 2.6 |
Calcium | 3.0 |
Casting compound | 2.5 |
Caster oil | 4.7 |
Ceramic, MgNb 2 O 6 | 21 |
Ceramic, ZnNb 2 O 6 | 25 |
Ceramic, MgTa 2 O 6 | 28 |
Ceramic, ZnTa 2 O 6 | 38 |
Chlorine (32° F) | 2.0 |
Chloroform (68° F) | 4.8 |
Concrete | 4.5 |
Diamond | 5.5 - 10 |
Ebonite | 2.5 - 2.9 |
Epoxy Resin (Cast ) | 3.6 |
Ethanol (25 o C, 77° F) | 24.3 |
Ethyl Acetate (77° F) | 6.0 |
Ethyl Alcohol (77° F) | 24.3 |
Ethylene glycol | 37 |
Formamide (20 o C) | 84 |
Furfural | 42 |
R12 Dichlorodifluoromethane (70° F) | 2.4 |
Glass | 3.7 - 10 |
Glycerin, Liquid | 47-68 |
Glycerol (77° F) | 42.5 |
Granite | 7 - 9 |
Graphite | 10 - 15 |
Guttapercha | 4 |
Hard paper, laminated | 4.5 |
Hydrazine (20 o C) | 52 |
Hydrocyanic acid (21 o C) | 2.3 |
Hydrofluoric acid (0 o C) | 83.6 |
Hydrogen peroxide (25 o C) | 60 |
Ice (-2 o C) | 3.2 |
Isoprene (77° F) | 2.1 |
Insulation of high voltage cables | 4.2 |
Insulation of telephone cables | 1.5 |
Marble | 8 |
Methanol (20 o C)) | 33.6 |
Mica | 2.5 - 7 |
Mineral Oil (80° F) | 2.1 |
Mylar | 3.1 |
Neoprene | 6.7 |
Nitrogen (68° F) | 1.000580 |
Nylon | 4.0 - 5.0 |
Oil paper | 4 |
Olive oil | 3 |
Paper | 2.3 |
Paper, impregnated | 5 |
Paper, waxed | 2.5 |
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, XLPE | 2.2-2.4 |
Polyamide | 2.8 |
Polymide | 3.4 |
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 |
Sapphire | 8.9 - 11.1 |
Shellac | 3.5 |
Silica Sand | 2.5-3.5 |
Silicon | 11.0 - 12.0 |
Silicon dioxide | 3.9 |
Silicon oil | 2.2 - 2.8 |
Slate | 4 |
Sodium chloride | 5.6 |
Soft rubber | 2.5 |
Steatite | 6 |
Sulfur | 3.5 |
Sulfuric acid (20 o C) | 84 |
Polytetrafluoroethylene (PTFE) | 2 |
Teflon, PTFE | 2.1 |
Titanium dioxide | 86 - 173 |
Transformer oil, mineral | 2.2 |
Transformer oil, vegetable | 2.5 |
Turpentine | 2.2 |
Vacuum | 1 |
Vulcanized fibres | 2.5 |
Water 1) | 4 - 88 |
Wood, Dry | 2 - 6 |
1) Water - permittivity is 88 at 0 o C (32 o F) and drops with rising temperature. Permittivity is 80 at 20 o C (212 o F) and 55.3 at 100 o C (212 o F).
Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.
Capacitors and capacitance - charge and unit of charge.
Parallel and serial connected capacitor circuits.
The electric force acting on a point charge.
The dielectric strength of a material is the ability to the material to act as an insulator.
The electromagnetic spectrum with wavelengths and frequencies.
Electromagnetism and formation of magnetic fields.
Chemical resistance of Polyester to products like Acetic acid, Diesel oil and others.
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