ASTM D3949-99(2004)

Standard Specification for Coated Glass Fabrics Used for Electrical Insulation (Withdrawn 2013)

ABSTRACT
This specification covers woven glass fabric coated with fully cured oleoresinous varnish, epoxy resin, polyurethane resin, or polyester resin. Excluded are coated polyester-glass fabric and glass fabric coated with silicone resins and silicone elastomers. Materials are identified according to the type of coating applied, as follows: Type 1, black oleoresinous varnish; Type 2, yellow oleoresinous varnish; Type 3, epoxy resin; Type 4, polyurethane (isocyanate) resin; and Type 5, polyester resin. Glass fabrics shall meet specified values for electrical (dielectric strength at room temperature after bending, and breakdown voltage after aging at an elevated temperature), mechanical (breaking strength, oil resistance, and temperature index), and dimensional (nominal thickness, width, and length) property requirements.
SCOPE
1.1 This specification covers woven glass fabric coated with fully cured oleoresinous varnish, epoxy resin, polyurethane resin, or polyester resin. Excluded are coated polyester-glass fabric and glass fabric coated with silicone resins and silicone elastomers.
1.2 It is recognized that several properties, notably breaking strength and dielectric strength, are related to the style of base fabric used for any particular thickness. This specification has been developed for materials using fabrics woven from relatively coarse-filament yarns and in some cases from relatively open-weave constructions, and property values are frequently somewhat lower than if finer filament yarns or closer weave constructions were used. The user is therefore alerted that significantly higher levels of performance test values may be obtained through the use of these latter types of alternate base constructions.
1.3 The values stated in inch-pound units are to be regarded as the standard.
WITHDRAWN RATIONALE
This specification covers woven glass fabric coated with fully cured oleoresinous varnish, epoxy resin, polyurethane resin, or polyester resin. Excluded are coated polyester-glass fabric and glass fabric coated with silicone resins and silicone elastomers.
Formerly under the jurisdiction of Committee D09 on Electrical and Electronic Insulating Materials, this practice was withdrawn in January 2013 in accordance with section 10.5.3.1 of the Regulations Governing ASTM Technical Committees, which requires that standards shall be updated by the end of the eighth year since the last approval date.

General Information

• Status: Withdrawn
• Publication Date: 09-Oct-1999
• Withdrawal Date: 31-Dec-2012
• ICS: 59.080.40 - Coated fabrics
• Technical Committee: D09 - Electrical and Electronic Insulating Materials
• Drafting Committee: D09.07 - Electrical Insulating Materials

Relations

• Replaces: ASTM D3949-99 - Standard Specification for Coated Glass Fabrics Used for Electrical Insulation
• Effective Date: 10-Oct-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
Designation:D3949 −99(Reapproved 2004) An American National Standard
Standard Specification for
Coated Glass Fabrics Used for Electrical Insulation
This standard is issued under the fixed designation D3949; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber 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 speci-
1.1 Thisspecificationcoverswovenglassfabriccoatedwith
fully cured oleoresinous varnish, epoxy resin, polyurethane fication refer to Terminology D1711.
resin, or polyester resin. Excluded are coated polyester-glass
fabric and glass fabric coated with silicone resins and silicone 4. Classification
elastomers.
4.1 The materials of this specification are identified accord-
ing to the type of coating applied, as follows:
1.2 Itisrecognizedthatseveralproperties,notablybreaking
strength and dielectric strength, are related to the style of base 4.1.1 Type 1—Black oleoresinous varnish,
fabric used for any particular thickness. This specification has 4.1.2 Type 2—Yellow oleoresinous varnish,
been developed for materials using fabrics woven from rela-
4.1.3 Type 3—Epoxy resin,
tively coarse-filament yarns and in some cases from relatively
4.1.4 Type 4—Polyurethane (isocyanate) resin, and
open-weave constructions, and property values are frequently
4.1.5 Type 5—Polyester resin.
somewhat lower than if finer filament yarns or closer weave
constructions were used. The user is therefore alerted that
5. Ordering Information
significantly higher levels of performance test values may be
5.1 Orders for material covered by this specification shall
obtained through the use of these latter types of alternate base
include the following:
constructions.
5.1.1 Type of coating,
1.3 The values stated in inch-pound units are to be regarded
5.1.2 Nature of finish, if any (waxy, greasy, dry, oily,
as the standard.
mica-dusted, and so forth),
5.1.3 Color of coating (oleoresinous only),
2. Referenced Documents
5.1.4 Nominal coated thickness and base fabric thickness,
2.1 ASTM Standards:
5.1.5 Put-up,
D902Test Methods for Flexible Resin-Coated Glass Fabrics
5.1.5.1 Full-Width Rolls—core size, trimmed or untrimmed,
and Glass Fabric Tapes Used for Electrical Insulation
length and width,
D1711Terminology Relating to Electrical Insulation
5.1.5.2 Sheets—length and width,
D1830Test Method for Thermal Endurance of Flexible
5.1.5.3 Tapes—core size, length, width,
Sheet Materials Used for Electrical Insulation by the
5.1.6 Number of units per package,
Curved Electrode Method
5.1.7 Type of packaging (sealed unit packages, carton size,
D2518Specification for Woven Glass Fabrics for Electrical
pallet size), and
Insulation
5.1.8 Marking on unit packages and cartons.
D3636Practice for Sampling and Judging Quality of Solid
Electrical Insulating Materials
6. Materials and Manufacture
6.1 Materials—The base fabric for all thicknesses shall be
woven from continuous-filament yarns and shall be in confor-
This specification is under the jurisdiction of ASTM Committee D09 on
mance with the requirements of Specification D2518.
Electrical and Electronic Insulating Materials and is the direct responsibility of
Subcommittee D09.07 on Flexible and Rigid Insulating Materials.
6.2 Splices—The material shall not be spliced unless agreed
Current edition approved Nov. 1, 2004. Published November 2004. Originally
upon by the purchaser and seller. If it is necessary to splice
approved in 1980. Last previous edition approved in 1994 as D3949–94. DOI:
10.1520/D3949-99R04.
rolls,splicesshalloccurnotmorethanonceineach100yd(92
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
m) or less, except that rolls having a length of 10 yd (9 m) or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
less shall contain no splices. Sheet materials shall contain no
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. splices.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D3949−99 (2004)
7. Electrical and Mechanical Requirements 11. Temperature Classification
11.1 The materials covered by this specification shall not
7.1 The electrical and mechanical requirements shall be in
have a temperature index less than that specified as follows
accordance with the values shown in Tables 1-3.
whentestedinaccordancewithTestMethodD1830usingalife
criterion of 20000 h:
8. Dimensional Requirements
Types 1 and 2 130
8.1 Thickness shall be in accordance with the values shown
Types 3 and 4 155
in Table 4.
Type 5 180
NOTE 2—In the case of materials for special applications, some of the
8.2 Width—Individual measurements on all samples se-
1 preceding types may have temperature indices below those stated, or may
lected shall not vary from the nominal by more than 6 ⁄32 in.
have life values less than 20 000 h. Use of these materials shall be agreed
(0.8mm)forwidthsupto1in.(25mm)andbymorethan 6 ⁄16
upon between the purchaser and the seller.
in. (1.6 mm) for widths 1 in. and over. Rolls trimmed to 36 in.
11.2 Thesellershall,attherequestofthepurchaser,provide
or1mshallnotbelessthanthatamount.Sheetsshallbewithin
a thermal life graph (Arrhenius plot) showing the nominal
6 ⁄8 in. (3.2 mm) of the nominal width and length specified.
temperature indices of the types of materials purchased.
8.3 Length—The length in yards or metres per roll shall not
12. Sampling
be less than specified.
12.1 Lot Definition—Refer to Terminology Section of Prac-
9. Workmanship and Appearance
tice D3636.
12.2 Unit of Sample—Theunitofsampleshallbetheunitof
9.1 Visual Nonconformities—The material shall be free
from the following nonconformities to the extent specified in product (rolls or sheets).
12.4:
12.3 Sampling the Lot—Randomly select, to the nearest
9.1.1 Weave distortion in base fabric,
integralpackage,anumberofpackagesequalto =N fromeach
9.1.2 Wrinkles, creases, tears,
lot, where N is the total number of packages in the shipment.
9.1.3 Dirt in coating,
These shall constitute the source of the unit sampling in 12.4
9.1.4 Nonuniform application of coating (runs, drains,
and 12.5.
wrinkles, uncoated spots),
12.4 Sampling for Visual and Dimensional Examination—
9.1.5 Poor adhesion of coating to fabric,
Selectarandomsampleofrollsorsheetsfrommaterialof12.3
9.1.6 Roughness caused by broken glass filaments, gels in
in accordance with Inspection Level I of Practice D3636.
coating,
Acceptance shall be determined in accordance with 11.1 and
9.1.7 Unevenly wound rolls,
Table4onthebasisofAQL=2.5.Takeasthetestsample5yd
9.1.8 Ragged cut edges of rolls,
(4.5 m) from each sampled roll or sheet.
9.1.9 Collapsed cores, and
12.5 Sampling for Performance Tests—Select a random
9.1.10 Unmarked splices, open splices.
sample of rolls or sheets from the material of 12.3 in accor-
dance with Inspection Level S-2 of Practice D3636. Take an
2 2
10. Oil Resistance
amount corresponding to about 0.5 yd (0.3 m ) from each
sampled roll or sheet.
10.1 The coated film shall show no evidence of blistering,
disintegration in the oil, or removal by the blotter used in the
13. Tests and Retests
test. The oil shall not become turbid. Thickness measurements
13.1 Iftheresultsofanytesttodetermineconformancewith
are not required, since there are no specifications for this
7.1 and 10.1 do not conform to the requirements prescribed in
property.
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