|
|
|
|
|
| |
| Material |
@ temp |
Relative permittivity
εr
(aka Dielectric constant k)
under 1 kHz
|
Dielectric
strength
V/m |
| Air (1 atm) |
20°C |
1.00059 |
3 x 106 |
| Air (100 atm) |
20°C |
1.0548 |
|
| Ammonia |
-80°C |
26 |
|
| Ammonia |
-40°C |
22 |
|
| Ammonia |
0°C |
20 |
|
| Ammonia |
20°C |
17 |
|
| Asphalt |
20°C |
3-5 |
|
| Barium strontium titanate |
20°C |
500 |
|
| Benzene |
20°C |
2.284-2.285 |
|
| Calcium copper titanate |
20°C |
>250,000 |
|
| Carbon disulfide |
20°C |
2.6 |
|
| Coal |
20°C |
4-5 |
|
| Concrete |
20°C |
4.5-30 |
|
| Cyclohexane |
20°C |
2.0243 |
|
| Diamond |
20°C |
5.5-10 |
|
| Diester (oil) |
20°C |
3.4-4.3 |
|
| Dolomite |
20°C |
6.8-8 |
|
| Ethylene glycol |
20°C |
37 |
|
| Formamide |
20°C |
84.0 |
|
| Gasses (1 atm) |
|
1.00xx |
|
| Germanium |
20°C |
16 |
|
| Glass |
20°C |
5-10 |
|
| Glass, Pyrex |
20°C |
5 (3.7-10) |
14 x 106 |
| Glycerin |
15°C |
56 |
|
| Glycerin |
20°C |
42.5 |
|
| Graphite |
20°C |
10-15 |
|
| Granite |
20°C |
5-8 |
|
| Hexane |
20°C |
1.8865 |
|
| Hydrocarbon lubrication oils |
room temp. |
2.1-2.4 |
|
| Hydrocyanic acid |
0 - 21 °C |
158 - 2.3 |
|
| Hydrofluoric acid |
0°C |
83.6 |
|
| Lead zirconate titanate |
20°C |
500-6000 |
|
| Limestone |
20°C |
7-9 |
|
| Metals |
|
infinite |
|
| Methanol |
20°C |
30 |
|
| Mica |
20°C |
3-6 |
|
| Mylar |
20°C |
3.1 |
|
| Neoprene |
20°C |
6.7 |
12 x 106 |
| Oil |
20°C |
4 |
12 x 106 |
| PAG (oil) |
20°C |
6.6-7.3 |
|
| PAO (oil) |
20°C |
2.1-2.4 |
|
| Paper |
20°C |
3.7-3.85 |
15 x 106 |
| Paraffin |
20°C |
2.2 |
10 x 106 |
| Petroleum |
20°C |
2 |
|
| Phosphate Ester (oil) |
20°C |
6.0-7.1 |
|
| Plexiglas |
20°C |
3.40 |
|
| Polyethylene XLPE |
20°C |
2.25 |
|
| Polyimide |
20°C |
3.4 |
|
| Polyol Ester PAG (oil) |
20°C |
4.6-4.8 |
|
| Polypropylene |
20°C |
2.2-2.36 |
|
| Polystyrene |
20°C |
2.4-2.7 |
24 x 106 |
| Polyvinyl chloride |
20°C |
3.18 |
|
| Porcelain |
20°C |
6-8 |
5 x 106 |
| PVC, Epoxy, Polyesters |
20°C |
3 |
|
| Quartz |
20°C |
4.3 |
8 x 106 |
| Rubber |
20°C |
7 |
|
| Rubber, neoprene |
20°C |
6.7 |
12 x 106 |
| Salt |
20°C |
3-15 |
|
| Sand |
20°C |
3-5 |
|
| Sapphire |
20°C |
8.9-11.1 (anisotropic) |
|
| Shellac |
20°C |
2.0-3.8 |
|
| Silicon |
20°C |
11.68 |
|
| Silicon dioxide |
20°C |
3.9-4.5 |
|
| Silicon nitride |
20°C |
7-8 (polycrystalline, 1MHz) |
|
| Silicone rubber |
20°C |
3.2-9.8 |
|
| Silicone varnish |
20°C |
2.8-3.3 |
|
| Strontium titanate |
20°C |
300-310 |
8 x 106 |
| Styrene resin |
20°C |
2.3-3.4 |
|
| sugar |
20°C |
3.0 |
|
| sugar (granulated) |
20°C |
1.5-2.2 |
|
| Sulfur |
20°C |
3.4 |
|
| Sulfuric acid |
20-25 °C |
84 -100 |
|
| Teflon |
20°C |
2.1 |
|
| Teflon PCTFE |
20°C |
2.3-2.8 |
|
| Teflon PTFE |
20°C |
2.0-2.1 |
|
| Titanium dioxide (rutile) |
20°C |
173 perp
86 para |
|
| Vacuum |
20°C |
1.0000 |
|
| Vaseline |
20°C |
2.2-2.9 |
|
| Vinyl (plastic) |
20°C |
2-4 |
50 x 106 |
| Water |
0°C |
87.9 |
|
| Water (liquid) |
20°C |
80-81 |
|
| Water |
100°C |
55.5 |
|
| Water |
200°C |
34.5 |
|
| Wax |
20°C |
2.4-6.5 |
|
| Wood (dry) |
20°C |
2.0-7 |
|
| Wood (pressed board) |
20°C |
2.0-2.6 |
|
| Wood (wet) |
20°C |
10-30 |
|
| xylene |
20°C |
2.4 |
|
Figure 10.65 Dielectric Constants of Various Materials [Turck Proximity Sensors Guide]
http://engineeronadisk.com/V2/book_implementation/engineeronadisk-93.html#pgfId-872506
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