ASTM-D7895 Standard Test Method for Thermal Endurance of Coating Powders Used for Powder Coating Insulation Systems

ASTM-D7895 - 2019 EDITION - CURRENT
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Standard Test Method for Thermal Endurance of Coating Powders Used for Powder Coating Insulation Systems
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Scope

1.1 This test method provides a procedure for evaluating thermal endurance of coating powders by determining the length of aging time at selected elevated temperatures required to achieve dielectric breakdown at room temperature at a pre-determined proof voltage. Thermal endurance is expressed in terms of a temperature index.

1.2 This test method is applicable to insulating powders used over a substrate material of steel.

1.3 Units—The values stated in either SI units or inch-pound units are to be regarded separately as standard. The values stated in each system are not necessarily exact equivalents; therefore, each system shall be used independently of the other. Combining values from the two systems is likely to result in non-conformance with the standard.

1.4 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 Section 7.

Significance and Use

5.1 A major factor affecting the life of insulating materials is thermal degradation. It is possible that other factors, such as moisture and vibration, will cause failures after the material has been weakened by thermal degradation.

5.2 Electrical insulation is effective in electrical equipment only as long as it retains its physical and electrical integrity. The following are potential indicators of thermal degradation: weight change, porosity, crazing, and generally a reduction in flexibility. Thermal degradation is usually accompanied by an ultimate reduction in dielectric breakdown.

5.3 This test method is useful in determining the thermal endurance of coating powders applied over a steel substrate material.

Keywords

dielectric breakdown voltage; integral bus bar; powder coating; temperature index; thermal endurance; thermal endurance graph; thermal life; thermal life curve;; ICS Number Code 29.060.10 (Wires); 29.080.01 (Insulation in general); 87.040 (Paints and varnishes)

To find similar documents by ASTM Volume:

10.02 (Electrical Insulation (II): D2518 - latest)

To find similar documents by classification:

29.060.10 (Wires Including electric rods, busbars, etc.)

29.080.01 (Electrical insulation in general)

87.040 (Paints and varnishes Including coating powders, paint coatings and protective paint systems)

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Document Number

ASTM-D7895_D7895M-19

Revision Level

2019 EDITION

Status

Current

Modification Type

New

Publication Date

Nov. 1, 2019

Document Type

Test Method

Page Count

6 pages

Committee Number

D09.01