Page 581 - Engineering Electromagnetics, 8th Edition

APPENDIX C Material Constants 563

Table C.1 and /

r
Material r /

Air 1.0005
Alcohol, ethyl 25 0.1
Aluminum oxide 8.8 0.000 6
Amber 2.7 0.002
Bakelite 4.74 0.022
Barium titanate 1200 0.013
Carbon dioxide 1.001
Ferrite (NiZn) 12.4 0.000 25
Germanium 16
Glass 4–7 0.002
Ice 4.2 0.05
Mica 5.4 0.000 6
Neoprene 6.6 0.011
Nylon 3.5 0.02
Paper 3 0.008
Plexiglas 3.45 0.03
Polyethylene 2.26 0.000 2
Polypropylene 2.25 0.000 3
Polystyrene 2.56 0.000 05
Porcelain (dry process) 6 0.014
Pyranol 4.4 0.000 5
Pyrex glass 4 0.000 6
Quartz (fused) 3.8 0.000 75
Rubber 2.5–3 0.002
Silica or SiO 2 (fused) 3.8 0.000 75
Silicon 11.8
Snow 3.3 0.5
Sodium chloride 5.9 0.000 1
Soil (dry) 2.8 0.05
Steatite 5.8 0.003
Styrofoam 1.03 0.000 1
Teflon 2.1 0.000 3
Titanium dioxide 100 0.001 5
Water (distilled) 80 0.04
Water (sea) 4
Water (dehydrated) 1 0
Wood (dry) 1.5–4 0.01