Hi All, Picked up some 6mm delrin sheet at a rally today (thanks Mike). Does anyone know if this is ok to use for a rotor on a spark gap?. The black isn't carbon as the stand off voltage is 50 kv in according to the RS catalog. It seems to be slightly less strong than tufnol so I was thinking of using two sheets stuck together. As anyone used this material for a gap.? cheers bob golding