ASTM D3394: Standard Test Methods for Sampling and Testing Electrical Insulating Board

These test methods cover the sampling and testing of electrical insulating boards. These boards are porous, usually fibrous sheets used for dielectric and structural purposes in electrical apparatus.

These test methods are not intended for testing vulcanized fibre or molded laminated sheets.

These test methods are applicable to board materials having a nominal thickness of at least 0.030 in. (0.76 mm).

NOTE 1—For materials thinner than 0.030 in. (0.76 mm) see Test Methods D202.

The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

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

aqueous extract characteristics pH

ash content

compressibility

conditioning

conductivity

degree of polymerization

dielectric strength

dimensions

electrical insulating board density

impulse dielectric strength

moisture content

oil absorption

shrinkage

tensile properties