PN E04431 ArkusZ02-1974 Electric insulating materials Methods of testing for the resi- stance to the action of chemical agresive atmospheres Test for the resistance to the action of the humide atmosphere containing sulphur dioxide
1974PN E04431 ArkusZ02-1974 Electric insulating materials Methods of testing for the resi- stance to the action of chemical agresive atmospheres Test for the resistance to the action of the humide atmosphere containing sulphur dioxide