Significance and Use
19.1 Apparent density affects the dielectric and physical characteristics of insulating board and is a factor in the economics of its use in apparatus. This test is useful for specification, design, and quality control purposes.
Scope
1.1 These 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.
1.2 These test methods are not intended for testing vulcanized fibre or molded laminated sheets.
1.3 These 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.
1.4 The 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
1.5 The 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.
1.6 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 consult and establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.7 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.