ASTM D229

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.

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 D 619.

1.2 The test methods appear in the following sections:

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.

2. Referenced Documents

D149 Test Method for Dielectric Breakdown Voltage and Dielectric Strength of Solid Electrical Insulating Materials at Commercial Power Frequencies
D150 Test Methods for AC Loss Characteristics and Permittivity (Dielectric Constant) of Solid Electrical Insulation
D1674 Methods of Testing Polymerizable Embedding Compounds Used for Electrical Insulation
D1711 Terminology Relating to Electrical Insulation
D1825 Practice for Etching and Cleaning Copper-Clad Electrical Insulating Materials and Thermosetting Laminates for Electrical Testing
D2132 Test Method for Dust-and-Fog Tracking and Erosion Resistance of Electrical Insulating Materials
D2303 Test Methods for Liquid-Contaminant, Inclined-Plane Tracking and Erosion of Insulating Materials
D256 Test Methods for Determining the Izod Pendulum Impact Resistance of Plastics
D257 Test Methods for DC Resistance or Conductance of Insulating Materials
D3487 Specification for Mineral Insulating Oil Used in Electrical Apparatus
D374 Test Methods for Thickness of Solid Electrical Insulation
D494 Test Method for Acetone Extraction of Phenolic Molded or Laminated Products
D495 Test Method for High-Voltage, Low-Current, Dry Arc Resistance of Solid Electrical Insulation
D5032 Practice for Maintaining Constant Relative Humidity by Means of Aqueous Glycerin Solutions
D570 Test Method for Water Absorption of Plastics
D6054 Practice for Conditioning Electrical Insulating Materials for Testing
D617 Test Method for Punching Quality of Phenolic Laminated Sheets
D619 Test Methods for Vulcanized Fibre Used for Electrical Insulation
D638 Test Method for Tensile Properties of Plastics
D669 Test Method for Dissipation Factor and Permittivity Parallel with Laminations of Laminated Sheet and Plate Materials
D695 Test Method for Compressive Properties of Rigid Plastics
D696 Test Method for Coefficient of Linear Thermal Expansion of Plastics Between 30C and 30C With a Vitreous Silica Dilatometer
D785 Test Method for Rockwell Hardness of Plastics and Electrical Insulating Materials
D790 Test Methods for Flexural Properties of Unreinforced and Reinforced Plastics and Electrical Insulating Materials
D792 Test Methods for Density and Specific Gravity (Relative Density) of Plastics by Displacement
D883 Terminology Relating to Plastics
E197 Specification for Enclosures and Servicing Units for Tests Above and Below Room Temperature
IEC 60893-2 Specification for Rigid Industrial Laminated Sheets Based on Thermosetting Resins for Electrical Purpose, Methods of Tests

Index Terms

ac breakdown voltage; arc resistance; ash content; bond strength; compressive strength; dissipation factor; elastic modulus; flame resistance; flexural strength; hard rubber; impact resistance; insulation resistance; permittivity; printed wiring boards; resistivity; rigid plates; rigid sheets; Rockwell hardness; solvent extractible; spacers; surface resistance; surface resistivity; tensile strength; terminal boards; thermal expansion; thermosetting laminate; thickness; tracking resistance; twist; voltage barriers; volume resistivity; warp; water absorption; ICS Number Code 29.035.01

Citing ASTM Standards

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