1.1These test methods cover the sampling and testing of electrical insulating boards. These boards are porous, usually fibrous sheets used for dielectric and structural purposes in electrical apparatus.
1.2These test methods are not intended for testing vulcanized fibre or molded laminated sheets.
1.3These test methods are applicable to board materials having a nominal thickness of at least 0.030 in. (0.76 mm).
Note 1:For materials thinner than 0.030 in. (0.76 mm) see Test Methods D202.
1.4The test methods appear in the following sections:
| Sections | ASTM Method Reference | |
| Apparent Density | 18 - 23 | |
| Aqueous Extract Characteristics | 36 - 42 | D202 |
| Ash Content | 43 - 46 | T 413 |
| Compatibility with Dielectric Liquids | 47 - 52 | D664, D877, D924, D971, D974, D1169, D1500, D1816, D3455, D3487 |
| Compressibility | 79 - 85 | |
| Conditioning | 11 | D685 |
| Degree of Polymerization | 86 - 89 | D4243 |
| Dielectric Strength in Air | 53 - 59 | D149 |
| Dielectric Strength in Oil | 60 - 65 | D149, D2413, D3426 |
| Dimensions of Sheets | 12 - 17 | |
| Moisture Content | 31 - 35 | D644 |
| Oil Absorption | 72 - 78 | |
| Reports | 10 | |
| Sampling | 6 - 9 | D3636 |
| Shrinkage | 24 - 30 | D644 |
| Tensile Properties | 66 - 71 | D202 |
1.5The values stated in inch-pound units are to be regarded as standard. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.
1.6This 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 consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
ASTM D3394-16 History
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