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.

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.