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Dielectric of Various Materials

The dielectric constant (permittivity) is the amount of electrical energy stored in an insulator when an electrical field is imposed across it.  The dielectric constant is expressed in terms of a ratio to that in a vacuum or (1.000000).  All other factors being equal, greater permittivity of the dielectric gives greater capacitance; less permittivity of the dielectric gives less capacitance.

The following table lists the dielectric constants of various common materials:

 

Dielectric Constant (Permittivity)

Material Dielectric
Acrylic (Plexiglass)
 2.7 - 4.5
Acrylonitrile Butadiene Styrene (ABS)
2.87
Acetal resin (Delrin)
3.6
Air
1.000585
Alumina
 9.3 - 11.5
Asbestos
3.0 - 4.8
Bakelite
3.5-5.0
Beeswax
2.6- 3.0
Celluloid
3.3-11
Epoxy Resin (Cast )
  3.6
Formica
 3.6 - 6
FR-4
4.3 - 5.0
Mica
 5.4
Micarta
 3.2 - 5.5
Neoprene 
6-9
Nylon
4.0 - 5.0
Paper (clean)
 3.0
Paraffin Wax
2.1-2.5
Phenol resin
 4.9
Polyamide
2.5-2.6
Polycarbonate (Lexan®)
 2.9-3.0
Polyester film (Mylar)
2.8 - 4.5
Polyethylene
2.27-2.5
Polypropylene
2.25
Polystyrene
 2.4-2.6
Polyvinyl Chloride (PVC)
 2.8-3.4
Porcelain
5.1-6.0
Pyrex Glass
4.3 - 5.0
Quartz
4.2
Rubber Cement
2.7-2.9
Silicon
11.0 - 12.0
Silicone Oil
2.2-2.9
Silicone Rubber
3.2-9.8
Silk
2.5-3.5
Styrene (ABS)
2.8
Teflon (PTFE)
 2.1
Teflon (glass weave)
 2.2-2.8
Water (Distilled)
 76.5 - 80
Wax
2.4-6.5
Wood, Dry
2-6
Wood, Wet
10-30
 




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