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.

1.2 The test methods appear in the following sections:

TestSectionsASTM
Test
Method Acetone extractable matter83 to 84D 494 Arc resistance47 D 495 Ash56 to 60 ... Bonding strength49 to 54... Burning rate and flame resistance61 to 75... Compressive strength25 D 695 Conditioning 4 D 6054 Dissipation factor34 to 40D 669 Dielectric strength28 to 33D 149 Expansion (linear thermal)76D 696 Flexural properties12 to 24D 790 Hardness (Rockwell)55 D 785 Insulation resistance and resistivity41 to 46D 257 Permittivity34 to 40D 150 Resistance to impact26 D 256 Tensile properties 7 to 11D 638 Thickness 5 to 6D 374 Tracking resistance48 D 2132 Warp or twist77 to 82... Water absorption27 D 570

1.3 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.

1.4 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 1.6.

1.6 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.

17.1 This test method covers the determination of flexural properties at elevated temperature, and as a function of time of exposure to elevated temperature.