ASTM D1305-99

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

SCOPE
1.1 This specification covers electrical grade unsized, unbleached sulfate paper and paperboard for use as layer insulation in coils, transformers, and similar apparatus. 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.

General Information

• Status: Historical
• Publication Date: 09-Mar-1999
• ICS: 29.035.10 - Paper and board insulating materials
• Technical Committee: D09 - Electrical and Electronic Insulating Materials

Relations

• Replaced By: ASTM D1305-99(2004) - Standard Specification for Electrical Insulating Paper and Paperboard-Sulfate (Kraft) Layer Type
• Effective Date: 10-Mar-1999
• Referred By: ASTM D4063-99(2022) - Standard Specification for Pressboard for Electrical Insulating Purposes
• Effective Date: 10-Mar-1999

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
An American National Standard
Designation: D 1305 – 99
Standard Specification for
Electrical Insulating Paper and Paperboard—Sulfate (Kraft)
Layer Type
This standard is issued under the fixed designation D 1305; 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 (e) indicates an editorial change since the last revision or reapproval.
TABLE 1 Types of Untreated Kraft Insulating Tissue, Paper, and
1. Scope
Paperboard
1.1 This specification covers electrical grade unsized, un-
Type Density Range, Nominal Thickness,
bleached sulfate paper and paperboard for use as layer insula-
g/cm mil (µm)
tion in coils, transformers, and similar apparatus. Other appli-
I less than 0.77 1 (25) to 30 (760)
cations may include, but are not limited to, turn insulation, slot
II 0.77 to 0.86 0.5 (12) to 30 (760)
liners, wedges, phase insulation, and separator papers in III 0.86 to 0.95 0.4 (10) to 30 (760)
IV over 0.95 0.2 (5) to 30 (760)
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,
NOTE 1—Water finish is not available with certain combinations of
1.1.2 Dense Coil Wrap,
Kraft type and thickness. In general, water finish is restricted to paper and
1.1.3 Kraft Coil Insulation,
paperboard in the higher density ranges, that is, Types III and IV.
1.1.4 Dry-Finished Kraft, and
6. Materials
1.1.5 Water-Finished Kraft.
6.1 Thematerialshallbenaturalunbleachedsulfatepaperor
2. Referenced Documents
paperboard, free of dyes, pigments, fillers, or sizing. It may be
2.1 ASTM Standards:
furnished either with water-finish or without.
D 202 Test Methods for Sampling and Testing Untreated
7. Detail Requirements
Paper Used for Electrical Insulation
D 1711 Terminology Relating to Electrical Insulation
7.1 The material shall conform to the chemical, physical,
and electrical requirements specified inTables 1-4, when tested
3. Terminology
in accordance with the methods prescribed in Section 11.
3.1 Definitions—For definitions of terms used in this stan-
8. Interpretation of Numerical Requirements
dard, refer to Terminology D 1711.
8.1 Unless otherwise stated, all specified limits in this
4. Classification
specification apply to the average of determinations applicable
4.1 Four types of paper and paperboard are covered by this
to a sample as defined.
specification, as shown in Table 1. The material is available in
9. Workmanship, Finish, and Appearance
sheets, pads, or rolls.
9.1 The material shall be uniform in thickness, density,
5. Ordering Information
formation, and texture. The material shall be as free of welts,
5.1 Orders shall specify the type, including whether water
wrinkles,creases,holes,slimespots,stains,shives,weakspots,
finish or not (see Note 1), nominal thickness, form, width,
blisters, tears, cuts, and other defects; and from resin, dirt,
length (for sheets), nominal outside diameter, and core inside
carbon, rubber, metal particles, corrosive substances, or other
diameter (for rolls).
foreign material, as consistent with good manufacturing pro-
cesses and in keeping with the requirements of this specifica-
tion. Rolls and pads shall be compactly wound. Splices shall be
This specification is under the jurisdiction of ASTM Committee D-9 on
kept to a minimum. Splicing compounds shall be noncorrosive
Electrical and Electronic Insulating Materials and is the direct responsibility of
Subcommittee D09.19 on Dielectric Sheet and Roll Products. and shall have no deleterious effect on the insulating or
Current edition approved March 10, 1999. Published June 1999. Originally
dielectric values of the paper.
published as D1305 – 54 T. Last previous edition D1305 – 87 (1998).
Annual Book of ASTM Standards, Vol 10.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 1305
TABLE 2 Chemical Requirements
end, with the name and type of material, specification number,
Property min max purchase order number, manufacturer’s name or trade mark, or
both, manufacturer’s roll number, lot number, and the date of
Ash, % . 0.5
Alcohol-soluble material, % . 1.0
manufacture. Each roll or pad shall be marked on one side with
A
Aqueous extract conductivity, mS/m . 1.0
the manufacturer’s name and lot number and the customer’s
Water-soluble chlorides, ppm . 32
Fiber composition: unbleached sulfate, % 100 .
purchase order number.
Moisture, as received, % 4 7
Moisture, as received, for water finished paper, % 4 9
13. Retest and Rejection
Hydrogen ion concentration, pH 6.5 8.0
A
1 mS/m 5 10 µV/cm.
13.1 If the results of any test do not conform to the
requirements prescribed in this specification, at the option of
10. Sampling
the manufacturer that test shall be repeated on two additional
sets of specimens from the same batch or shipment, each of
10.1 Sample the paper in accordance with Test Methods
which shall conform to the requirements specified. If either of
D 202.
these two additional sets of specimens fails, the material may
11. Test Methods
be rejected at the option of the purchaser.
11.1 The properties of the paper shall be determined in
13.2 Notice of failure of material based on tests made in
accordancewithTestMethodsD 202,exceptworkmanshipand
accordance with this specification shall be reported to the
appearance shall be visually judged.
manufacturer within 3 weeks from receipt of the material by
the purchaser.Any portion of an accepted shipment of material
12. Packaging and Package Marking
that is subsequently shown not to have been in accordance with
12.1 Packaging—The material shall be wound on a one-
this specification at the time of receipt may be rejected,
piece substant
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