ASTM D2400-99
(Specification)Standard Specification for Varnished Glass-Polyester Cloth Used for Electrical Insulation
Standard Specification for Varnished Glass-Polyester Cloth Used for Electrical Insulation
SCOPE
1.1 This specification applies to black and yellow varnished woven cloth and tape for electrical insulation, having as a base fabric poly(ethylene terephthalate) yarns in the warp direction and glass yarns in the filler direction.
1.2 The values stated in inch-pound units are to be regarded as the standard.
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An American National Standard
Designation: D 2400 – 99
Standard Specification for
Varnished Glass-Polyester Cloth Used for Electrical
Insulation
This standard is issued under the fixed designation D 2400; 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.
1. Scope 4.1.7 Marking on package.
1.1 This specification applies to black and yellow varnished
5. Materials and Manufacture
woven cloth and tape for electrical insulation, having as a base
5.1 Materials—The base fabric for all thickness and color
fabric poly(ethylene terephthalate) yarns in the warp direction
styles shall have a nominal thickness of 0.004 in. (0.10 mm)
and glass yarns in the filler direction.
and a warp by filler thread count per inch (or centimetre) of
1.2 The values stated in inch-pound units are to be regarded
32(12.6) by 28(11.0) respectively. The varnish shall be of the
as the standard.
oleoresinous type.The warp threads shall consist of 140 denier
2. Referenced Documents continuous filament yarns having a twist of 5 turns per inch,
and the filler threads shall consist of ECG-150-1/0 yarns.
2.1 ASTM Standards:
5.2 Splices—The material shall not be spliced unless agreed
D 295 Test Methods for Varnished Cotton Fabrics Used for
upon by the purchaser and the manufacturer. If it is necessary
Electrical Insulation
to splice, splices shall not occur more than once in each roll of
D 902 Test Methods for Flexible Resin-Coated Glass Fab-
100 yd (92 m) or less, except that rolls having a length of 6 yd
rics and Glass Fabric Tapes Used for Electrical Insulation
(5.5 m) or less shall contain no splices. All splices shall be
D 1711 Terminology Relating to Electrical Insulation
flagged in a manner suitable to the purchaser.
D 3487 Specification for Mineral Insulating Oil Used in
5.3 Nonconformities—The varnished fabric and tape shall
Electrical Apparatus
be free from wrinkles, blisters, or any imperfections which will
D 3636 Practice for Sampling and Judging Quality of Solid
detract from its value as electrical insulation.
Electrical Insulating Materials
6. Electrical and Mechanical Requirements
3. Terminology
6.1 The electrical and mechanical requirements shall be in
3.1 Definitions: For definitions of terms used in this speci-
accordance with the values shown in Table 1.
fication refer to Terminology D 1711.
7. Oil Resistance
4. Ordering Information
7.1 The varnish film shall show no evidence of blistering, or
4.1 Orders for material covered by this specification shall
disintegration in the oil or on the blotter used in the test. The
include the following:
oil used in the test shall not become turbid.
4.1.1 Color: black or yellow,
4.1.2 Nominal thickness, width and length,
NOTE 1—Slight swelling of the film in that portion of the material
4.1.3 Type of surface: greasy or dry,
located between the yarns sometimes occurs, particularly with freshly
coated goods. This is evidenced by a regularity in the spacing of the
4.1.4 Core size and type,
“blisters” and can be differentiated from true blistering, which occurs
4.1.5 Type of packing: dry or in oil,
randomly spaced over the surface of the test specimens.
4.1.6 Number of rolls per package, and
8. Dimensional Requirements
8.1 Thickness requirements shall be in accordance with the
This specification is under the jurisdiction of ASTM Committee D-9 on
values shown in Table 2.
Electrical and Electronic Insulating Materials and is the direct responsibility of
8.2 The nominal width shall be specified in the purchase
Subcommittee D09.07 on Flexible and Rigid Insulating Materials.
Current edition approved Oct. 10, 1999. Published November 1999. Originally
order. Individual measurements on all samples selected shall
published as D 2400 – 67 T. Last previous edition D 2400 – 99.
not vary from the nominal width by more than 6 ⁄32 in. (0.8
Annual Book of ASTM Standards, Vol 10.01.
3 mm) for tapes 1 in. (25 mm) or less in width nor more than
Annual Book of ASTM Standards, Vol 10.03.
4 1
Annual Book of ASTM Standards, Vol 10.02. 6 ⁄16 in. (1.6 mm) for tapes over 1 in. in width.
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D 2400
A
TABLE 1 Electrical and Mechanical Requirements
Color Style Black Yellow
Nominal Thickness, in. (mm) 0.008 (0.20) 0.010 (0.25) 0.012 (0.31) 0.008 (0.20) 0.010 (0.25)
Breaking strength, lbf/in. (N/m): (7.0) (7.0) (7.0) (7.0) (7.0)
Warp 40 40 40 40 40
Filler 100 (17.5) 100 (17.5) 100 (17.5) 100 (17.5) 100 (17.5)
Tear resistance, g, warp yarns 500 500 500 500 500
Elongation (warp), %,
25 lb 3 min 7.0 7.0 7.0 7.0 7.0
Dielectric breakdown voltage kV:
Unstressed 10.5 12.5 15.0 9.5 11.0
Under 6 % elongation 8.5 10.0 12.5 8.0 9.5
After hot oil 10.5 12.5 15.0 9.5 11.0
Temperature index at 20 000 h 130 130 130 130 130
A
All values shown are minimum averages unless otherwise noted.
TABLE 2 Thickness Requirements
10.3 in accordance with Inspection Level S-2 of Practice
2 2
Nominal Thickness, D 3636. An amount correspondi
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