ASTM D1459-93(1998)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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.
Designation: D 1459 – 93 (Reapproved 1998) An American National Standard
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Specification for
Silicone Varnished Glass Cloth and Tape for Electrical
Insulation
This standard is issued under the fixed designation D 1459; 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 4.1.2 Type B—For use where primarily physical properties
are required.
1.1 This specification covers clear silicone varnished glass
fabrics in the form of sheets, rolls, and tapes for use as
5. Ordering Information
electrical insulation.
5.1 Orders for material covered by this specification shall
1.2 The product covered by this specification shall be
include the following information:
designed to conform to Class 180 electrical insulating materials
5.1.1 The form and type (Sections 1 and 4),
as classified by IEEE Standard No. 1.
5.1.2 The desired nominal thickness, width, and length
1.3 The values stated in inch-pound units are to be regarded
(Section 8),
as the standard except temperature which is stated in degrees
5.1.3 The number of rolls in a package (Section 15), and
celsius.
5.1.4 The marking on a package (Section 15).
2. Referenced Documents
6. Materials and Manufacture
2.1 ASTM Standards:
6.1 The glass fabric shall be treated with a baking type of
D 902 Test Methods for Flexible Resin-Coated Glass Fab-
2 silicone varnish so as to penetrate the fabric and produce a
rics and Glass Fabric Tapes Used for Electrical Insulation
2 smooth, non-tacky surface, substantially free of wrinkles,
D 1711 Terminology Relating to Electrical Insulation
creases, blisters, and other imperfections.
D 1830 Test Method for Thermal Endurance of Flexible
6.2 The material shall not be spliced. No more than two
Sheet Materials Used for Electrical Insulation by the
pieces shall be used in each multiple of 25 yd (23 m) of linear
Curved Electrode Method
length in any one roll of full-width cloth, and no more than two
D 3636 Practice for Sampling and Judging Quality of Solid
pieces shall be used in each multiple of 36 yd (33 m) of linear
Electrical Insulating Materials
4 length in any one roll of type.
2.2 IEEE Standard:
No. 1 General Principles Upon Which Temperature Limits
7. Physical Properties
are Based in the Rating of Electric Machines and Other
7.1 Breaking Strength—The warp average breaking strength
Equipment
of the material in the warp thread direction shall be not less
3. Terminology than that prescribed for the corresponding types and nominal
thicknesses designated in Table 1.
3.1 Definitions: For definitions of terms used in this stan-
dard, refer to Terminology D 1711.
8. Dimensional Requirements
8.1 Thickness—The average thickness shall not vary more
4. Types
than 60.5 mil (0.013 mm) from the nominal thicknesses for
4.1 This specification covers two types of silicone varnished
specified thicknesses up to and including 5 mils (0.13 mm), and
glass fabrics as follows:
610 % from the nominal thickness for specified thicknesses
4.1.1 Type A—For use where primarily electrical properties
above 5 mils.
are required, and
8.2 Width—Full-width rolls and sheets shall be 36 61 in.
(900 625 mm) in width, and shall be supplied trimmed unless
This specification is under the jurisdiction of ASTM Committee D-9 on
otherwise specified. The width of individual tapes shall not
Electrical and Electronic Insulating Materials and is the direct responsibility of
vary more than 6 ⁄32 in. (0.8 mm) from the specified width for
Subcommittee D 09.07 on Flexible and Rigid Insulating Materials.
1 1
Current edition approved Jan. 15, 1993. Published March 1993. Originally issued
tapes 1 ⁄2 in. (38 mm) or less in width, nor more than 6 ⁄16 in.
as D 1459 – 57 T. Last previous edition D 1459 – 88. 1
(1.6 mm) for tapes over 1 ⁄2 in. in width.
Annual Book of ASTM Standards, Vol 10.01.
3 8.3 Length—The nominal length per roll shall be as speci-
Annual Book of ASTM Standards, Vol 10.02.
fied in the purchase order. The measured lengths of individual
Available from The Institute of Electrical and Electronics Engineers, Inc., 345
E. 47th St., New York, NY 10017.
NOTICE:¬This¬standard¬has¬either¬been¬superceded¬and¬replaced¬by¬a¬new¬version¬or¬discontinued.¬
Contact¬ASTM¬International¬(www.astm.org)¬for¬the¬latest¬information.¬
D 1459
TABLE 1 Dielectric and Breaking Strength Requirements
Breaking Strength, lbf/in. Dielectric Strength, as Received V/mil Breakdown Voltage,
Nominal
(N/mm) of width (kV/mm) after Bending, total, V
Thickness, mils
Type Type Type Type Type Type
(mm)
A B A B A B
3 (0.076) 70 (12.25) . . 1300 (51.2) . . 3 700 .
4 (0.102) 70 (12.25) . . 1300 (51.2) . . 5 000
...