ASTM D2148-02e1
(Test Method)Standard Test Methods for Bondable Silicone Rubber Tapes Used for Electrical Insulation
Standard Test Methods for Bondable Silicone Rubber Tapes Used for Electrical Insulation
SIGNIFICANCE AND USE
Self-adhesion is a primary initial property since it affects layer-to-layer bonding. The integrity of the bond can significantly affect the electrical and physical performance of the insulation system. Therefore, the degree of self-adhesion is directly related to apparatus performance.
A high degree of self-adhesion is desirable for most electrical applications. In this test, a short unwinding length indicates a high degree of self-adhesion.
This test method has been found useful as a quality control test for lot acceptance.
SCOPE
1.1 These test methods cover tests for bondable silicone rubber tapes which form a sealed structure either with the application of heat (and pressure if needed) or by the process of auto-adhesion (self-fusing).
1.2 The methods appear in the following sections:Test MethodSectionAdhesion3-9 Bond Strength10-17 Dielectric Breakdown Voltage18-25 Hardness40Length 32 and 33Thickness26-31Width 35-39
1.3 The values stated in inch-pound units are to be regarded as the standard except for °C.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. For a specific hazard statement see 22.1.1.
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Standards Content (Sample)
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An American National Standard
e1
Designation:D2148–02
Standard Test Methods for
Bondable Silicone Rubber Tapes Used for Electrical
1
Insulation
This standard is issued under the fixed designation D 2148; 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
e NOTE—Adjunct references were corrected editorially in April 2006.
1. Scope Coated Tapes Used for Electrical and Electronic Applica-
tions
1.1 These test methods cover tests for bondable silicone
D 1458 Test Methods for Fully Cured Silicone Rubber-
rubber tapes which form a sealed structure either with the
Coated Glass Fabric and Tapes for Electrical Insulation
application of heat (and pressure if needed) or by the process
D 2240 Test Method for Rubber Property—Durometer
of auto-adhesion (self-fusing).
Hardness
1.2 The methods appear in the following sections:
D 6054 Practice for Conditioning Electrical Insulating Ma-
Test Method Section
terials for Testing
Adhesion 3-9
2.2 ASTM Adjuncts:
Bond Strength 10-17
3
Tack tester (one drawing)
Dielectric Breakdown Voltage 18-25
Hardness 40
ADHESION
Length 32 and 33
Thickness 26-31
Width 35-39
3. Scope
1.3 The values stated in inch-pound units are to be regarded 3.1 This test method covers the determination of the self-
as the standard except for °C. adhesion of unsupported, self-fusing silicone rubber rectangu-
1.4 This standard does not purport to address all of the lar and taper-edge (Note 1) tape designed for use as electrical
safety concerns, if any, associated with its use. It is the insulation.
responsibility of the user of this standard to establish appro-
NOTE 1—Taper-edge tape includes such cross sections as triangular,
priate safety and health practices and determine the applica-
lens, etc.
bility of regulatory limitations prior to use. For a specific
4. Significance and Use
hazard statement see 22.1.1.
4.1 Self-adhesionisaprimaryinitialpropertysinceitaffects
2. Referenced Documents
layer-to-layer bonding. The integrity of the bond can signifi-
2
2.1 ASTM Standards:
cantly affect the electrical and physical performance of the
D 149 Test Method for Dielectric Breakdown Voltage and
insulation system. Therefore, the degree of self-adhesion is
Dielectric Strength of Solid Electrical Insulating Materials
directly related to apparatus performance.
at Commercial Power Frequencies
4.2 A high degree of self-adhesion is desirable for most
D 374 Test Methods for Thickness of Solid Electrical Insu-
electrical applications. In this test, a short unwinding length
lation
indicates a high degree of self-adhesion.
D 1000 Test Methods for Pressure-Sensitive Adhesive-
4.3 This test method has been found useful as a quality
control test for lot acceptance.
1
These methods are under the jurisdiction of ASTM Committee D09 on
5. Apparatus
Electrical and Electronic Insulating Materials and are the direct responsibility of
5.1 Inclined Mandrel Tack Test Fixture—A suggested fix-
Subcommittee D09.07 on Flexible and Rigid Insulating Materials.
3
5
Current edition approved March 10, 2002. Published June 2002. Originally ture is shown in Fig. 1. The mandrel shall consist of a ⁄8-in.
approved in 1963. Last previous edition approved in 1995 as D 2148 – 95.
(15.9-mm) diameter aluminum rod mounted in low-friction
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
3
Standards volume information, refer to the standard’s Document Summary page on Available from ASTM International Headquarters. Order Adjunct No.
the ASTM website. ADJD2148. Original adjunct produced in 1965.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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D2148–02
mandrel at a speed of approximately 18 in. (450 mm)/min.
Using the winding procedure and weights just described, half
lap the marked tape sample on the mandrel over the first piece
of tape. With the winding weight attached, return the test
fixture to a horizontal position and allow the tape to bond for
1 min. Remove the winding weight from the tape and the
handle from the fixture and proceed with the unwinding test.
7.2 Unwinding—After the tape has bonded for 1 min, attach
a load of 21 oz (600 g)/in. (25 mm) of the original tape width
(Note2).Attachtheweighttothefreeendofthetapebymeans
of a bulldog paper clamp or other suitable device. Release the
weight and record the length of tape unwound in 3 min.
Although the original 1-in. dimensions will elongate due to the
unwind weight, consider ea
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