ASTM D1459-93(2003)

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An American National Standard
Designation: D 1459 – 93 (Reapproved 2003)
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 4.1.1 Type A—For use where primarily electrical properties
are required, and
1.1 This specification covers clear silicone varnished glass
4.1.2 Type B—For use where primarily physical properties
fabrics in the form of sheets, rolls, and tapes for use as
are required.
electrical insulation.
1.2 The product covered by this specification shall be
5. Ordering Information
designedtoconformtoClass180electricalinsulatingmaterials
5.1 Orders for material covered by this specification shall
as classified by IEEE Standard No. 1.
include the following information:
1.3 The values stated in inch-pound units are to be regarded
5.1.1 The form and type (Sections 1 and 4),
as the standard except temperature which is stated in degrees
5.1.2 The desired nominal thickness, width, and length
celsius.
(Section 8),
2. Referenced Documents 5.1.3 The number of rolls in a package (Section 15), and
5.1.4 The marking on a package (Section 15).
2.1 ASTM Standards:
D 902 Test Methods for Flexible Resin-Coated Glass Fab-
6. Materials and Manufacture
rics and Glass Fabric Tapes Used for Electrical Insulation
2 6.1 The glass fabric shall be treated with a baking type of
D 1711 Terminology Relating to Electrical Insulation
silicone varnish so as to penetrate the fabric and produce a
D 1830 Test Method for Thermal Endurance of Flexible
smooth, non-tacky surface, substantially free of wrinkles,
Sheet Materials Used for Electrical Insulation by the
creases, blisters, and other imperfections.
Curved Electrode Method
6.2 The material shall not be spliced. No more than two
D 3636 Practice for Sampling and Judging Quality of Solid
3 pieces shall be used in each multiple of 25 yd (23 m) of linear
Electrical Insulating Materials
4 length in any one roll of full-width cloth, and no more than two
2.2 IEEE Standard:
pieces shall be used in each multiple of 36 yd (33 m) of linear
No. 1 General Principles Upon Which Temperature Limits
length in any one roll of tape.
are Based in the Rating of Electric Machines and Other
Equipment
7. Physical Properties
3. Terminology 7.1 Breaking Strength—Thewarpaveragebreakingstrength
of the material in the warp thread direction shall be not less
3.1 Definitions: For definitions of terms used in this stan-
than that prescribed for the corresponding types and nominal
dard, refer to Terminology D 1711.
thicknesses designated in Table 1.
4. Types
8. Dimensional Requirements
4.1 Thisspecificationcoverstwotypesofsiliconevarnished
8.1 Thickness—The average thickness shall not vary more
glass fabrics as follows:
than 60.5 mil (0.013 mm) from the nominal thicknesses for
specifiedthicknessesuptoandincluding5mils(0.13mm),and
This specification is under the jurisdiction of ASTM Committee D09 on
610 % from the nominal thickness for specified thicknesses
Electrical and Electronic Insulating Materials and is the direct responsibility of
above 5 mils.
Subcommittee D09.07 on Flexible and Rigid Insulating Materials.
8.2 Width—Full-width rolls and sheets shall be 36 61 in.
Current edition approved March 10, 2003. Published April 2003. Originally
approved in 1957. Last previous edition approved in 1998 as D 1459 – 93 (1998). (900 625 mm) in width, and shall be supplied trimmed unless
Annual Book of ASTM Standards, Vol 10.01.
otherwise specified. The width of individual tapes shall not
Annual Book of ASTM Standards, Vol 10.02.
4 vary more than 6 ⁄32 in. (0.8 mm) from the specified width for
Available from The Institute of Electrical and Electronics Engineers, Inc., 445
Hoes Lane, Piscataway, NJ 08854–1331.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D 1459 – 93 (2003)
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 .
5 (0.127) 70 (12.25) 100 (17.51) 1300 (51.2) 1000 (39.4) 6 200 4 500
7 (0.178) 100 (17.51) 150 (26.27) 1200 (47.3) 1000 (39.4) 8 000 6 000
10 (0.254) 150 (26.27) 250 (43.79) 1100 (43.3) 450 (17.7) 10 500 4 000
12 (0.305) 150 (26.27) 250 (43.79) 1100 (43.3) 600 (23.6) 12 500 6 000
15 (0.381) 250 (43.79) 300 (52.54) 650 (25.6) 400 (15.8) 9 000 5 000
20 (0.508) 300 (52.54) 350 (61.29) 400 (15.8) 300 (11.8) 7 200 5
...