4-10
Figure 4-6.—Coaxial line.
Table 4-1.—Dielectric Constants of Materials
Material
Dielectric
constant
(Approx.)
Material
Dielectric
constant
(Approx.)
Air
1.0
Lucite
2.5
Amber
2.6-2.7
Mica (electrical)
4.0-9.0
Asbestos Fiber
3.1-4.8
Mica (clear India)
7.5
Bakelite (asbestos base)
5.0-22
Mica (filled phenolic)
4.2-5.2
Bakelite (mica filled)
4.5-4.8
Micaglass (titanium dioxide)
9.0-9.3
Barium Titanate
100-1250
Micarta
3.2-5.5
Beeswax
2.4-2.8
Mycalex
7.3-9.3
Cambric (varnished)
4.0
Neoprene
4.0-6.7
Carbon Tetrachloride
2.17
Nylon
3.4-22.4
Celluloid
4.0
Paper (dry)
1.5-3.0
Cellulose Acetate
2.9-4.5
Paper (coated)
2.5-4.0
Durite
4.7-5.1
Paraffin (solid)
2.0-3.0
Ebonite
2.7
Plexiglas
2.6-3.5
Epoxy Resin
3.4-3.7
Polycarbonate
2.9-3.2
Ethyl Alcohol (absolute)
6.5-25
Polyethylene
2.5
Fiber
5.0
Polyimide
3.4-3.5
Formica
3.6-6.0
Polystyrene
2.4-3.0
Glass (electrical)
3.8-14.5
Porcelain (dry process)
5.0-6.5
Glass (photographic)
7.5
Porcelain (wet process)
5.8-6.5
Glass (Pyrex)
4.6-5.0
Quartz
5.0
Glass (window)
7.6
Quartz (fused)
3.78
Gutta Percha
2.4-2.6
Rubber (hard)
2.0-4.0
Isolantite
6.1
Ruby Mica
5.4
Selenium (amorphous)
6.0
Styrofoam
1.03
Shellac (natural)
2.9-3.9
Teflon
2.1
Silicone (glass) (molding)
3.2-4.7
Titanium Dioxide
100
Silicone (glass) (laminate)
3.7-4.3
Vaseline
2.16
Slate
7.0
Vinylite
2.7-7.5
Soil (dry)
2.4-2.9
Water (distilled)
34-78
Steatite (ceramic)
5.2-6.3
Waxes, mineral
2.2-2.3
Stearite (low loss)
4.4
Wood (dry)
1.4-2.9
