Relative Permittivity
Reference data and engineering information about relative permittivity for miscellaneous applications.
relativepermittivity
Overview
Engineering reference data for Relative Permittivity in miscellaneous.
Key Formulas
Unit Conversion
Multiply by conversion factor.
Linear Interpolation
Estimate between two known points.
Percentage
Part as fraction of whole.
Variables
| Symbol | Description | Unit |
|---|---|---|
| Input value | — | |
| Output value | — | |
| Conversion factor | — |
94 rows
Material | Relative Permittivity (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 |
| Air (Dry) (68°F) | 1.000536 |
| Air, Liquid (-191 oC) | 1.4 |
| Alumina | 9.3-11.5 |
| Aluminum Bromide (212°F) | 3.4 |
| Aluminum Fluoride | 2.2 |
| Ammonia (-74°F) | 25 |
| Ammonia (69°F) | 16.5 |
| Aniline (68°F) | 7.3 |
| Bakelite | 3.5-5.0 |
| Benzene (68°F) | 2.3 |
| Carbon dioxide (68°F) | 1.000921 |
| Ceramic, MgNb2O6 | 21 |
| Ceramic, ZnNb2O6 | 25 |
| Ceramic, MgTa2O6 | 28 |
| Ceramic, ZnTa2O6 | 38 |
| Chloroform (68°F) | 4.8 |
| Concrete | 4.5 |
| Diamond | 5.5 - 10 |
| Ebonite | 2.5 - 2.9 |
| Epoxy Resin (Cast) | 3.6 |
| Ethanol (25 oC, 77°F) | 24.3 |
| Ethylene glycol | 37 |
| Formamide (20 oC) | 84 |
| Formica | 4.6 - 4.9 |
| Furfural | 42 |
| R12 Dichlorodifluoromethane (70°F) | 2.4 |
| Glass | 3.7 - 10 |
| Glass, Pyrex | 4.8 |
| Glycerin, Liquid | 47-68 |
| Glycerol (77°F) | 42.5 |
| Granite | 7 - 9 |
| Graphite | 10 - 15 |
| Ice (-2 oC) | 3.2 |
| Isoprene (77°F) | 2.1 |
| Insulation of high voltage cables | 4.2 |
| Insulation of telephone cables | 1.5 |
| Marble | 8 |
| Methanol (20 oC) | 33.6 |
| Mica | 2.5 - 7 |
| Mineral Oil (80°F) | 2.1 |
| Mylar | 3.1 |
| Neoprene | 6.7 |
| Nylon | 4.0 - 5.0 |
| Oil paper | 4 |
| 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 |
| Pyrex Glass | 4.3 - 5.0 |
| Quartz | 4.5 |
| Rubber | 3 |
| 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 oC) | 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 | 4 - 88 |
| Wood, Dry | 2 - 6 |
Source: engineeringtoolbox.com
Temperature Dependence
The relative permittivity of a material is not a constant and can vary significantly with temperature. This is especially true for polar materials like water. For example, water's permittivity is approximately *88 at 0°C (32°F), dropping to *80 at 20°C (68°F) and further decreasing to *55.3 at 100°C (212°F). When selecting a dielectric material for an application, its permittivity value must be considered at the operating temperature.