6/13/01 - HC


				Dielectric
				Strength	Required thickness
Dielectric 	Constant	kV/mm		mm		inch
air		1.00054		3		6.663069	0.262326
polystrene	2.6		24		0.320513	0.01261
Paper		3.5		16		0.357143	0.014061
pyrex		4.7		14		0.303951	0.011967
PPS-(ryton)	3		21.25984	0.31358		0.012346
Kapton 18-1a	4		91.86352	0.054429	0.002143
Kynar		9		62.99213	0.035278	0.001389

18-1a is one of the lower quality Kapton tapes with respect to the dielectric



Required thickness is calculated by

d= 20 kV / (Dielectric strength * dielectric constant)