1. Scope 1.1 These test methods cover procedures for testing rigid electrical insulation normally manufactured in flat sheet or plate form. They are generally used as terminal boards, spacers, voltage barriers, and circuit boards. Note 1-For tests applying to vulcanized fibre reference should be made to Test Methods D619. 1.2 The test methods appear in the following sections: ASTM Test Test Sections Method Acetone extractable matter 83 to 84 D494 Arc resistance 47 D495 Ash 56 to 60 Bonding strength 49 to 54 Burning rate and flame resistance 61 to 75 Compressive strength 25 D695 Conditioning 4 D618 Dissipation factor 34 to 40 D669 Dielectric strength 28 to 33 D149 Expansion (linear thermal) 76 D696 Flexural properties 12 to 24 D790 Hardness (Rockwell) 55 D785 Insulation resistance and resistivity 41 to 46 D257 Permittivity 34 to 40 D150 Resistance to impact 26 D256 Tensile properties 7 to 11 D638 Thickness 5 to 6 D374 Tracking resistance 48 D2132 Warp or twist 77 to 82 Water absorption 27 D570 1.3 The values stated in inch-pound units are to be regarded as the standard. The metric equivalents of inch-pound units given in these test methods may be approximate. 1.4 This is a fire-test-response standard. See Sections 61 through 75, which are the procedures for burning rate and flame resistance. 1.5 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 establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in Note 5 and 61.5.