6.1 This characteristic is useful for specification purposes and has utility as a quality control parameter.

1.1 These test methods cover the evaluation of the characteristics of glass-bonded, natural, or synthetic mica materials intended for use as electrical insulation.

1.2 Glass bonded mica materials are commercially available in both injection molded and compression molded types. These test methods are applicable to both types except for tensile strength methods. (See Section 41.)

1.3 The test methods appear in the following sections:

Test Method

Section

ASTM Test Method

Arc Resistance

57 – 59

D495

Compressive Strength

33 – 35

D695

Conditioning

5

D618

Dielectric Strength

48 – 51

D149

Dissipation Factor

43 – 47

D150 and D2149

Heat Distortion Temperature

24 – 29

D648

Impact Resistance

36 – 39

D256

Modulus of Rupture

30 – 32

D790 and C674

Permittivity

43 – 47

D150 and D2149

Porosity

13 – 16

D116

Resistivity, Volume and Surface

52 – 56

D257

Rockwell Hardness

10 – 12

D785

Specific Gravity

 6 – 9

D792

Specimens

4

Tensile Strength

40 – 42

D638 and D651

Terminology

3

D1711

Thermal Conductivity

17 – 19

C177 and E1225

Thermal Expansion

20 – 23

E228 and E289

Thickness

49 and 54

D374

1.4 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.

1.5 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 and health practices and determine the applicability of regulatory limitations prior to use. See also Sections 45, 49, 54, and 58.