ASTM D1305-16(2022)

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.
Designation:D1305 −16 (Reapproved 2022)
Standard Specification for
Electrical Insulating Paper and Paperboard—Sulfate (Kraft)
Layer Type
This standard is issued under the fixed designation D1305; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 3. Terminology
3.1 Definitions—For definitions of terms used in this
1.1 This specification covers electrical grade unsized, un-
standard, refer to Terminology D1711.
bleached sulfate paper and paperboard for use as layer insula-
tion in coils, transformers, and similar apparatus. Other appli-
4. Classification
cations include, but are not limited to, turn insulation, slot
4.1 Four types of paper and paperboard are covered by this
liners, wedges, phase insulation, and separator papers in
stranded wire/cable constructions. Tissue for the manufacture specification, as shown in Table 1. The material is available in
sheets, pads, or rolls.
of capacitors is not included in this specification. Other
commonly used designations include:
5. Ordering Information
1.1.1 Soft Coil Wrap,
5.1 Orders shall specify the type, including whether water
1.1.2 Dense Coil Wrap,
finish or not (see Note 1), nominal thickness, form, width,
1.1.3 Kraft Coil Insulation,
length (for sheets), nominal outside diameter, and core inside
1.1.4 Dry-Finished Kraft, and
diameter (for rolls).
1.1.5 Water-Finished Kraft.
NOTE 1—Water finish is not available with certain combinations of
1.2 The values stated in inch-pound units are to be regarded
Kraft type and thickness. In general, water finish is restricted to paper and
as standard. The values given in parentheses are mathematical
paperboard in the higher density ranges, that is, Types III and IV.
conversions to SI units that are provided for information only
6. Materials
and are not considered standard.
6.1 Thematerialshallbenaturalunbleachedsulfatepaperor
1.3 This international standard was developed in accor-
paperboard, free of dyes, pigments, fillers, or sizing. It is
dance with internationally recognized principles on standard-
furnished either with water-finish or without.
ization established in the Decision on Principles for the
Development of International Standards, Guides and Recom-
7. Detail Requirements
mendations issued by the World Trade Organization Technical
7.1 The material shall conform to the chemical, physical,
Barriers to Trade (TBT) Committee.
andelectricalrequirementsspecifiedinTables1-4,whentested
in accordance with the methods prescribed in Section 11.
2. Referenced Documents
2.1 ASTM Standards: 8. Interpretation of Numerical Requirements
D202 Test Methods for Sampling and Testing Untreated
8.1 Unless otherwise stated, all specified limits in this
Paper Used for Electrical Insulation
specification apply to the average of determinations applicable
D1711 Terminology Relating to Electrical Insulation
to a sample as defined.
9. Workmanship, Finish, and Appearance
This specification is under the jurisdiction of ASTM Committee D09 on
9.1 The material shall be uniform in thickness, density,
Electrical and Electronic Insulating Materials and is the direct responsibility of
formation, and texture. The material shall be as free of welts,
Subcommittee D09.01 on Electrical Insulating Products.
wrinkles,creases,holes,slimespots,stains,shives,weakspots,
Current edition approved May 1, 2022. Published May 2022. Originally
blisters, tears, cuts, and other defects; and from resin, dirt,
approved in 1954. Last previous edition approved in 2016 as D1305 – 16. DOI:
9910.1520/D1305-16R22.
carbon, rubber, metal particles, corrosive substances, or other
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
foreign material, as consistent with good manufacturing pro-
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
cesses and in keeping with the requirements of this specifica-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. tion.Rollsandpadsshallbecompactlywound.Splicesshallbe
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D1305−16 (2022)
TABLE 1 Types of Untreated Kraft Insulating Tissue, Paper, and
protectorstoensureagainstedgedamage.Thematerialshallbe
Paperboard
packed in moisture-proof wrappers, boxes, or cartons so
Type Density Range, Nominal Thickness,
constructed as to ensure acceptance by common or other
g/cm mil (µm)
carriers for safe transportation at the lowest rate to the point of
I less than 0.77 1 (25) to 30 (760)
delivery, unless otherwise specified in the contract or order.
II 0.77 to 0.86 0.5 (12) to 30 (760)
III 0.86 to 0.95 0.4 (10) to 30 (760)
12.2 Package Marking—Each container shall be marked on
IV over 0.95 0.2 (5) to 30 (760)
the side or on one end of the package, or on both the side and
end, with the name and type of material, specification number,
purchase order number, manufacturer’s name or trade mark, or
TABLE 2 Chemical Requirements
both, manufacturer’s roll number, lot number, and the date of
Property min max
manufacture. Each roll or pad shall be marked on one side with
Ash, % . 0.5
the manufacturer’s name and lot number and the customer’s
Alcohol-soluble material, % . 1.0
A
Aqueous extract conductivity, mS/m . 1.0
purchase order number.
Water-soluble chlorides, ppm . 32
Fiber composition: unbleached sulfate, % 100 .
13. Retest and Rejection
Moisture, as received, % 4 7
Moisture, as received, for water finished paper, % 4 9 13.1 If the results of any test do not conform to the
Hydrogen ion concentration, pH 6.5 8.0
requirements prescribed in this specification, at the option of
A
1 mS/m = 10 µΩ/cm.
the manufacturer that test shall be repeated on two additional
sets of specimens from the same batch or shipment, each of
which shall conform to the requirements specified. If either of
kept to a minimum. Splicing compounds shall be noncorrosive these two additional sets of specimens fails, it is acceptable to
and shall have no deleterious effect on the insulating or reject the material at the option o
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