TABLE OF CONTENTS Values are relative dielectric constants (relative permittivities). As indicated by er=1.00000 for a vacuum, all values are relative to a vacuum.
[Multiply by e0=8.8542 10 12 F/m (permittivity of free space) to obtain absolute permittivity.]
| Substance | Dielectric Constant k (relative) | Dielectric Strength (V/mil) | Max Temp ( F) |
|---|---|---|---|
| ABS (plastic) | 2.4 3.8 | 410 | 140 |
| Air | 1.00054 | 30 70 | |
| Alumina | 8.1 9.5 | ||
| Aluminum Silicate | 5.3 5.5 | ||
| Bakelite | 3.7 | ||
| Bakelite (mica filled) | 4.7 | 325 375 | |
| Beeswax (yellow) | 2.7 | ||
| Beryllium oxide | 6.7 | ||
| Butyl Rubber | 2.4 | ||
| Diamond | 5.5 10 | ||
| Delrin (acetyl resin) | 3.7 | 500 | 180 |
| Enamel | 5.1 | 450 | |
| Epoxy glass PCB | 5.2 | 700 | |
| Formica XX | 4.00 | ||
| Fused quartz | 3.8 | ||
| Fused silica (glass) | 3.8 | ||
| Germanium | 16 | ||
| Glass | 4 10 | ||
| Gutta-percha | 2.6 | ||
| Halowax oil | 4.8 | ||
| Kapton Type 100 | 3.9 | 7400 | 500 |
| Type 150 | 2.9 | 4400 | |
| Kel-F | 2.6 | ||
| Lexan | 2.96 | 400 | 275 |
| Lucite | 2.8 | ||
| Mica | 4.5 8.0 | 3800 5600 | |
| Mica, Ruby | 5.4 | ||
| Micarta 254 | 3.4 5.4 | ||
| Mylar | 3.2 | 7000 | 250 |
| Neoprene | 6 9 | 600 | |
| Neoprene rubber | 6.7 | ||
| Nomex | 800 | 450 | |
| Nylon | 3.2 5 | 400 | 280 |
| Oil (mineral, squibb) | 2.7 | 200 | |
| Paper (bond) | 3.0 | 200 | |
| Paraffin | 2 3 | ||
| Phenolica (glass-filled) | 5 7 | ||
| Phenolics (cellulose-filled) | 4 15 | ||
| Phenolics (mica-filled) | 4.7 7.5 | ||
| Plexiglass | 2.2 3.4 | 450 990 | |
| Polyethylene LDPE/HDPE | 2.3 | 450 1200 | 170 |
| Polyamide | 2.5 2.6 | ||
| Polypropylene | 2.2 | 500 | 250 |
| Polystyrene | 2.5 2.6 | 500 |
