ASTM D952-15(2021)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D952 − 15 (Reapproved 2021)
Standard Test Method for
Bond or Cohesive Strength of Sheet Plastics and Electrical
Insulating Materials
This standard is issued under the fixed designation D952; 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 (´) indicates an editorial change since the last revision or reapproval.
1. Scope D6988 GuideforDeterminationofThicknessofPlasticFilm
Test Specimens
1.1 This test method covers the determination of the bond
E691 Practice for Conducting an Interlaboratory Study to
strength or ply adhesion strength of sheet plastic and electrical
Determine the Precision of a Test Method
insulating materials. It is applicable to both laminated and
2.2 ANSI Standard:
nonlaminated thermoplastic and thermosetting materials.
B1.1 Standard for Unified Screw Threads
1.2 Test data obtained by this test method is relevant and
appropriate for use in engineering design.
3. Terminology
1.3 The values stated in SI units are to be regarded as
3.1 Definitions—For definitions of technical terms pertain-
standard. The values given in parentheses after SI units are
ing to plastics used in this test method, see Terminology D883.
provided for information only and are not considered standard.
1.4 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
4.1 This test, when applied to laminated plastics, is a
responsibility of the user of this standard to establish appro-
measureoftheinterlaminarorintralaminarstrength,whichever
priate safety, health, and environmental practices and deter-
is smaller, in a direction normal to the plane of the laminate.
mine the applicability of regulatory limitations prior to use.
When applied to nonlaminated plastics, the test is a measure of
NOTE 1—There is no known ISO equivalent to this standard.
the cohesive strength of the material. The property determined
1.5 This international standard was developed in accor- is fundamental and has not yet been correlated with the results
dance with internationally recognized principles on standard- of any other method for bond strength.
ization established in the Decision on Principles for the
4.2 The test is potentially useful as (1) a research test when
Development of International Standards, Guides and Recom-
studying the effects of changes in independent variables, (2)a
mendations issued by the World Trade Organization Technical
specification test, or (3) a referee test.
Barriers to Trade (TBT) Committee.
4.3 Beforeproceedingwiththistestmethod,makereference
to the specification of the material being tested. Any test
2. Referenced Documents
specimen preparation, conditioning, dimensions or testing
2.1 ASTM Standards:
parameters or combination thereof covered in the relevant
D618 Practice for Conditioning Plastics for Testing
ASTM materials specification shall take precedence over those
D883 Terminology Relating to Plastics
in this test method. If there are no relevant ASTM material
D4000 Classification System for Specifying Plastic Materi-
specifications then the default conditions apply. Table 1 of
als
Classification System D4000 lists the ASTM materials stan-
D5947 Test Methods for Physical Dimensions of Solid
dards that currently exist.
Plastics Specimens
5. Apparatus and Materials
This test method is under the jurisdiction of ASTM Committee D09 on
5.1 Testing Machine—Any suitable tensile testing machine
Electrical and Electronic Insulating Materials and is the direct responsibility of
capable of crosshead movement at a constant rate of 1.3
Subcommittee D09.07 on Electrical Insulating Materials.
mm/min. (0.05 in/min.) and of sufficient capacity to exceed the
Current edition approved Sept. 1, 2021. Published September 2021. Originally
failure load of the material being tested.
approved in 1948. Last previous edition approved in 2015 as D952 – 15.
DOI:10.1520/D0952-15R21.
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
Standards volume information, refer to the standard’s Document Summary page on Available from American National Standards Institute (ANSI), 25 W. 43rd St.,
the ASTM website. 4th Floor, New York, NY 10036, http://www.ansi.org.
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D952 − 15 (2021)
TABLE 1 Precision Data
the material. Opposite surfaces need to be as parallel as
Average Coefficient of Variation possible to prevent eccentric loading of the material.
A B
Materials Strength, MPa
ν Within ν Between
r R
6.1.1 Thickness of the test specimens shall be determined in
Laboratories Laboratories
(psi)
BMC 12.7 (1840) 7.1 7.1
accordance with Guide D6988 for materials 0.25 mm or less in
SMC 14.0 (2030) 5.4 8.8
thickness, and Test Methods D5947 for materials greater than
A
ν is the within-laboratories standard deviation of the mean, expressed as a
r
0.25 mm in thickness.
percentage of the listed average.
B
ν is the between-laboratories standard deviation of the mean, expressed as a
R
6.2 At least five specimens shall be tested for each sample.
percentage of the listed average.
6.3 For testing the material specified, this test method is
designed so that failure between the adhesive and the metal
5.2 Loading Fixtures—The loading fixtures shall be self-
does normally not occur. If failure does occur between the
aligning and shall not apply eccentric loads.
adhesive and the metal blocks, or between the adhesive and the
specimen, discard the result and test another specimen.
5.3 Metal Blocks—A pair of 51-mm (2-in.) square metal
blocks each having a maximum height of 51 mm (2 in.). Each
7. Conditioning
block shall be configured to permit attachment to the testing
machine’s loading fixture (see Fig. 1).
7.1 Conditioning—Condition the test specimens at 23 6 2
NOTE 2—Blocks constructed from heat-treated aluminum alloy, each
°C (73.4 6 3.6 °F) and 50 6 10 % relative humidity for not
having a hole in one end tapped ⁄8 in. in accordance with ANSI B1.1, to
less than 40 hours for test specimens 7 mm or less in thickness,
accommodate threaded ⁄8-in. studs of convenient length, have been used
and at 23 6 2 °C (73.4 6 3.6 °F) and 50 6 10 % relative
successfully.
humidity for not less than 88 hours for test specimens greater
5.4 Adhesive—It is acceptable to use any adhesive that is
than 7 mm in thickness in accordance with Procedure A of
found to perform satisfactorily under this test provided that it
Practice D618, unless otherwise specified by contract or
...