Significance and Use
3.1 For any given ceramic composition, one or more of the properties covered herein may be of more importance for a given insulating application than the other properties. Thus, it may be appropriate that selected properties be specified for testing these ceramic materials.
3.2 Pertinent statements of the significance of individual properties may be found in the sections pertaining to such properties.
Scope
1.1 These test methods outline procedures for testing samples of vitrified ceramic materials that are to be used as electrical insulation. Where specified limits are mentioned herein, they shall not be interpreted as specification limits for completed insulators.
1.2 These test methods are intended to apply to unglazed specimens, but they may be equally suited for testing glazed specimens. The report section shall indicate whether glazed or unglazed specimens were tested.
1.3 The test methods appear as follows:
Section
Test Method
Related
Standard(s)
6
Compressive Strength
C773
13
Dielectric Strength
D618, D149
8
Elastic Properties
C623
15
Electrical Resistivity
D618, D257, D1829
7
Flexural Strength
C674, F417
9
Hardness
C730, E18
5
Porosity
C373
14
Relative Permittivity and Dissipation
Factor
D150, D2149, D2520
4
Specific Gravity
C20, C329, F77
10
Thermal Conductivity
C177, C408
12
Thermal Expansion
C539, E288
11
Thermal Shock Resistance
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. Specific warning statements are given in 11.3, 13.5, and 15.3.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
