【国外标准】 Standard Test Methods for Rigid Sheet and Plate Materials Used for Electrical Insulation

18.1 This test method provides useful engineering information for evaluating the mechanical behavior of rigid electrical insulation at elevated temperature. When the proper exposure and test temperatures are chosen, depending on the material and end-use operating temperature, use the test method as one means of indicating relative thermal degradation of rigid insulating materials.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 They are generally used as terminal boards, spacers, voltage barriers, and circuit boards.1.2 Use Test Methods D619 (withdrawn) or Specification D710 for tests applying to vulcanized fibre.1.3 Some of the test methods contained in this standard are similar to those contained in IEC 60893-2, which applies to rigid industrial laminated sheets based on thermosetting resins for electrical purposes.1.4 The test methods appear in the following sections:Test Sections ASTM TestMethodAcetone extractable matter 82 to 83 D494Arc resistance 47 D495Ash 56 to 60 ...Bonding strength 49 to 54 ...Flammability methods I and II 61 to 74 ...Coefficient of linear thermal expansion 76 D696Compressive strength 25 D695Conditioning  4 D6054Dissipation factor 34 to 40 D669Dielectric strength 28 to 33 D149Expansion (linear thermal) 75 D696Flexural properties 12 to 24 D790Hardness (Rockwell) 55 D785Insulation resistance and resistivity 41 to 46 D257Permittivity 34 to 40 D150Resistance to impact 26 D256Tensile properties  7 to 11 D638Thickness  5 to 6 D374Tracking resistance 48 D2132Warp or twist 76 to 81 ...Water absorption 27 D5701.5 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.1.6 This is a fire-test-response standard. See Sections 61 through 74, which are the procedures for assessing ignitability and burning time under specific test conditions1.7 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific precautionary statements are given in 31.1 and 1.8.1.8 This standard measures and describes the response of materials, products, or assemblies to heat and flame under controlled conditions, but does not by itself incorporate all factors required for fire hazard or fire risk assessment of the materials, products, or assemblies under actual fire conditions.1.9 Fire testing is inherently hazardous. Adequate safeguards for personnel and property shall be employed in conducting these tests.1.10 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.