Значение и использование

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, the test method may be used as one means of indicating relative thermal degradation of rigid insulating materials.

Область применения

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 D 619.

Note 2—This standard resembles IEC 60893-2, Specification for Rigid Industrial Laminated Sheets Based On Thermosetting Resins for Electrical Purpose, Methods of Tests.

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1.2 The test methods appear in the following sections:

TestSectionsASTM Test MethodAcetone extractable matter 83 to 84D 494Arc resistance47 D 495Ash56 to 60 ...Bonding strength49 to 54...Burning rate and flame resistance61 to 75...Compressive strength25 D 695Conditioning4 D 6054Dissipation factor34 to 40D 669Dielectric strength28 to 33D 149Expansion (linear thermal)76D 696Flexural properties12 to 24D 790Hardness (Rockwell)55 D 785Insulation resistance and resistivity41 to 46D 257Permittivity34 to 40D 150Resistance to impact26 D 256Tensile properties7 to 11D 638Thickness5 to 6D 374Tracking resistance48 D 2132Warp or twist77 to 82...Water absorption27 D 570

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 31.1 and 61.5.