Relative Permittivity Chart
For a discussion on permittivity and capacitance, see our lesson on capacitors.
Approximate relative permittivities at room temperature unless otherwise specified
| Material | εr |
| Air (1 atm) | 1.00058986 |
| Air (100 atm) | 1.0548 |
| Acetaldehyde | 21.8 (41°F) |
| Acetic Acid | 6.2 |
| Acetone | 20.7 (77°F) |
| Acetyl Acetone | 23.1 |
| Acetyl Bromide | 16.5 |
| Acetyl Chloride | 15.8 |
| Acetylene | 1.0217 (32°F) |
| Alcohol | 16-31 |
| Aluminum fluoride | 2.2 |
| Aluminum oxide (alumina) | 9.3-11.5 |
| Amber | 2.8-2.9 |
| Ammonia | 17 |
| Aniline | 7.3 |
| Argon | 1.000513 |
| Bakelite | 3.5-5 |
| Barium strontium titanate | 500 |
| Barium titanate | 1200 |
| Benzene | 2.3 |
| Body tissue | 8 |
| Butane | 1.4 (30°F) |
| Calcium copper titanate | >250,000 |
| Carbon disulfide | 2.6 |
| Carbon dioxide | 1.000921 |
| Calcium | 3.0 |
| Casting compound | 2.5 |
| Caster oil | 4.7 |
| Chlorine | 2.0 (32°F) |
| Chloroform | 4.8 |
| Concrete | 4.5 |
| Diamond | 5.5-10 |
| Ebonite | 2.5-2.9 |
| Electroactive polymers | 2-12 |
| Epoxy resin | 3.6 |
| Ethanol | 24.3 |
| Ethyl acetate | 6 |
| Ethyl alcohol | 24.3 |
| Ethylene glycol | 37 |
| Formamide | 84 |
| Furfural | 42 |
| Gallium Arsenide | 12.4 |
| Glass | 3.7-10 |
| Glycerin | 47-68 |
| Glycerol | 47 |
| Granite | 7-9 |
| Graphite | 10-15 |
| Guttapercha | 4 |
| Hard paper (laminated) | 4.5 |
| Hydrazine | 52 |
| Hydrocyanic Acid | 2.3 |
| Hydrofluoric Acid | 83.6 (0 C) |
| Hydrogen peroxide | 60 (-25 C) |
| Ice | 3.2 (-2°C) |
| Isoprene | 2.1 (77°F) |
| Lead zirconate titanate | 500-6000 |
| Marble | 8 |
| Methanol | 30 |
| Mica | 3-6 |
| Mineral Oil | 2.1 (80°F) |
| Mylar | 3.1 |
| Neoprene | 6.7 |
| Nitrogen | 1.000580 |
| Nylon | 4-5 |
| Oil paper | 4 |
| Olive oil | 3 |
| Paper | 1.4 |
| 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 | 2.25 |
| Polyamide | 2.8 |
| Polyimide | 3.4 |
| Polypropylene | 2.2-2.36 |
| Polystyrene | 2.4-2.7 |
| Polytetrafluoroethylene (PTFE/Teflon) | 2.1 |
| Porcelain | 5-7 |
| Pressed board | 4 |
| Pyrex | 4.7 |
| Quartz | 4.5 |
| Rubber | 7 |
| Salt | 3-15 |
| Sapphire | 8.9-11.1 |
| Shellac | 3.5 |
| Silica sand | 2.5-3.5 |
| Silicon | 11.68 |
| Silicon dioxide | 3.9 |
| Silicon oil | 2.2-2.8 |
| Silicon nitride | 7-8 |
| Silicon rubber | 2.9-4 |
| Slate | 4 |
| Sodium Chloride | 5.6 |
| Soft rubber | 2.5 |
| Steatite | 6 |
| Strontium titanate | 310 |
| Sulfur | 3.5 |
| Sulfuric acid | 84-100 |
| Titanium dioxide | 86-173 |
| Transformer oil (mineral) | 2.2 |
| Transformer oil (vegetable) | 2.5 |
| Turpentine | 2.2 |
| Vacuum | 1 |
| Vulcanized fibers | 2.5 |
| Water | 80.2 |
| Wood (dry) | 2-6 |