Page 144 - Physics - XII

Appendix - II : Dielectric ConstantsDielectric Constants
Appendix - II :
of Some Common
of Some Common
Materials (at 20
Materials (at 20°°C)C)

S. No. Material Frequency (Hz) Dielectric Constant

1. Amber 10 6 2.8

2. Amber 3 × 10 9 2.6
3. Soda glass 10 6 7.5
4. Fused quartz 10 to 10 8 3.8
3
5. Liquid paraffi n (Medical Grade) 10 3 2.2
6. Transformer oil (Class B) 10 3 2.2

7. Marble 10 6 8
8. Sand (dry) 10 6 3

9. Sandstone 10 6 10
10. Paper (oil impregnated condenser tissue) 10 3 2.3

11. Mica 10 to 10 8 5.4 to 7
3
12. Epoxy resin (e.g., Araldite) 10 6 3.3
13. Cellulose Acetate 10 6 3.5

14. Vinyl Acetate (Plasticised) 10 6 4
15. Vinyl Chloride (P.V.C.) 10 6 4

16. Ebonite (Pure) 10 6 3
17. Rubber (Vulcanised soft) 10 6 3.2

18. Rubber, Synthetic 10 6 2.5
19. Paraffi n wax 10 6 2.2

20. Sulphur 3 × 10 9 3.4
21. Walnut wood (dry) 10 7 2.0
22. Walnut (17% moisture) 10 7 5

23. Vacuum any 1.00000
24. Air Upto 3 × 10 9 1.00054

25. Porcelain 10 6 5.5
26. Barium titanate 10 6 1200

27. Rutile groups 10 to 10 9 40 to 80
6
27. Water 10 9 80

28. Water 10 10 64

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