Table 1. Formulations of Rubber Compound for Dielectric Materials

Ingredients	NR	NBR
Ingredients	PHR
NR (CV50)	100
NBR (KNB35L)		100
Stearin acid	1	1
ZnO	5	5
Carbon black (N330)	5	5
Antioxidant	1	1
Process Oil (A#2)	10	10
Blowing agent (OBSH)^*	7	7
Crosslinking agent (DCP)^**	2	2
Crosslinking Co-agent (PDM)^***	0.5	0.5

OBSH : 4,4 -Oxydienzenesulfonyl hydrazide
DCP : Dicumyl peroxide
PDM : N,N -m-phenylene dimaleimide