Standard Practice for Preparation of Insulating Paper and Board Impregnated with a Liquid Dielectric

1.1 These test methods cover the preparation and electrical testing of insulating paper and board impregnated with a liquid dielectric. They provide for measuring dissipation factor (power factor), permittivity (dielectric constant), and dielectric strength. Where these methods state only "paper," the same procedure shall apply to board.

1.2 These test methods have been found practicable for papers having nominal thickness of 0.05 mm (2 mil) and above. They have been used successfully for insulating board as thick as 6 mm (1/4 in.) when care is taken to assure the specimen geometry necessary for valid measurement of dielectric properties. Suitable geometry depends on the electrode system used. Rigid solid opposing electrodes require flat specimens that have essentially parallel surfaces.

1.3 The values stated in SI units are to be regarded as the standard.

1.4 This standard does not purport to address all of the safety problems, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. >