1. Scope

1.1 This test method provides procedures for evaluating the thermal endurance of rigid electrical insulating materials. Dielectric strength, flexural strength, or water absorption are determined at room temperature after aging for increasing periods of time in air at selected-elevated temperatures. A thermal-endurance graph is plotted using a selected end point at each aging temperature. A means is described for determining a temperature index by extrapolation of the thermal endurance graph to a selected time.

1.2 This test method is most applicable to rigid electrical insulation such as supports, spacers, voltage barriers, coil forms, terminal boards, circuit boards and enclosures for many types of application where retention of the selected property after heat aging is important.

1.3 When dielectric strength is used as the aging criterion, this test method may also be used for some thin sheet (flexible) materials, which become rigid with thermal aging, but is not intended to replace Test Method D 1830 for those materials which must retain a degree of flexibility in use.

1.4 This test method is not applicable to ceramics, glass, or similar inorganic materials.

1.5 The values stated in metric units are to be regarded as standard. Other units (in parentheses) are provided for information.

1.6 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. A specific warning statement is given in 10.3.4.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies

D229 Test Methods for Rigid Sheet and Plate Materials Used for Electrical Insulation

D570 Test Method for Water Absorption of Plastics

D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials

D1830 Test Method for Thermal Endurance of Flexible Sheet Materials Used for Electrical Insulation by the Curved Electrode Method

D5423 Specification for Forced-Convection Laboratory Ovens for Evaluation of Electrical Insulation

Keywords

a-c breakdown voltage; flexural strength; heat aging; rigid plates; rigid sheets; thermal endurance; thermosetting laminates; water absorption; Electrical field strength; Electrical insulating plastics; Electrical insulating solids; Flexural testing--electrical insulating materials; Ovens; Thermal analysis (TA)--electrical insulation; Water absorption--electrical insulating materials;

ICS Code

ICS Number Code 29.035.01 (Insulating materials in general)

DOI: 10.1520/D2304-97R02

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