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ASTM D 374
Thickness of Solid Electrical Insulation
ASTM D 374 Caliper covers the determination of the thickness of several types of solid electrical insulating materials employing recommended techniques. The values, stated in inch-pound units, are the standard for reporting.
Some electrical properties, such as dielectric strength, vary with the thickness of the material. Determination of certain properties, such as relative permittivity (dielectric constant) and volume resistivity, usually require a knowledge of the thickness. Design and construction of electrical machinery require that the thickness of insulation be known.
IPS performs Test Method A on plastic sheet and film with a machinist micrometer.
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