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ASTM D1305-16(2022)

Current Reaffirmation

Standard Specification for Electrical Insulating Paper and Paperboard—Sulfate (Kraft) Layer Type

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1.1 This specification covers electrical grade unsized, unbleached sulfate paper and paperboard for use as layer insulation in coils, transformers, and similar apparatus. Other applications include, but are not limited to, turn insulation, slot liners, wedges, phase insulation, and separator papers in stranded wire/cable constructions. Tissue for the manufacture of capacitors is not included in this specification. Other commonly used designations include:

1.1.1 Soft Coil Wrap,

1.1.2 Dense Coil Wrap,

1.1.3 Kraft Coil Insulation,

1.1.4 Dry-Finished Kraft, and

1.1.5 Water-Finished Kraft.

1.2 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.

1.3 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.


This specification covers electrically insulating, unbleached sulfate paper and paperboard used as layer insulation in coils, transformers, and other similar apparatus. The materials may also be used as turn insulation, slot liners, wedges, phase insulation, and separator papers in stranded wire/cable constructions. This specification does not include tissue for manufacture of capacitors. Other commonly used terms for the materials include soft coil wrap, dense coil wrap, kraft coil insulation, dry-finished kraft, and water-finished kraft. The materials covered in this specification are classified into four types according to density range and nominal thickness and should conform to the required values of ash content, alcohol-soluble material content, aqueous extract conductivity, water-soluble chloride content, fiber composition, moisture content, hydrogen ion concentration, pH, tensile strength, dielectric breakdown voltage, and conducting paths.


SDO ASTM: ASTM International
Document Number D1305
Publication Date May 1, 2022
Language en - English
Page Count 4
Revision Level 16(2022)
Supercedes
Committee D09.01
Publish Date Document Id Type View
Nov. 1, 2016 D1305-16 Revision
March 10, 1999 D1305-99 Revision
May 1, 2022 D1305-16R22 Reaffirmation
Oct. 1, 2009 D1305-99R09 Reaffirmation
March 10, 1999 D1305-99R04 Reaffirmation