1.1These 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.
1.2These 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.
1.3The test methods appear as follows:
| Procedure | Section | |
| | | |
| Compressive strength | 6 | C773 |
| Dielectric strength | 13 | D618, D149 |
| Elastic properties | 8 | C623 |
| Electrical resistivity | 15 | D618, D257, D1829 |
| Flexural strength | 7 | C674, F417 |
| Hardness | 9 | C730, E18 |
| Porosity | 5 | C373 |
| Relative permittivity and dissipation factor | 14 | D150, D2149, D2520 |
| Specific gravity | 4 | C20, C329, F77 |
| Thermal conductivity | 10 | C177, C408 |
| Thermal expansion | 12 | C539, E288 |
| Thermal shock resistance | 11 | |
1.4This 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 precaution statements are given in 11.3, 13.5, and 15.3.