Standard Test Method for Peel or Stripping Strength of Adhesive Bonds

ABSTRACT
This test method details the standard procedures for the determination of the comparative peel or stripping strength characteristics of adhesive bonds when tested on standard-sized specimens and under defined conditions of pretreatment, temperature, and testing machine speed. This method requires the use of a power-driven testing machine with a constant rate-of-jaw separation or of the inclination balance or pendulum type, and conditioning room or desiccator.
SCOPE
1.1 This test method covers the determination of the comparative peel or stripping characteristics of adhesive bonds when tested on standard-sized specimens and under defined conditions of pretreatment, temperature, and testing machine speed.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 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.

General Information

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Historical
Publication Date
30-Sep-2010
Technical Committee
Current Stage
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ASTM D903-98(2010) - Standard Test Method for Peel or Stripping Strength of Adhesive Bonds
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D903 − 98 (Reapproved 2010)
Standard Test Method for
Peel or Stripping Strength of Adhesive Bonds
This standard is issued under the fixed designation D903; 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.
This standard has been approved for use by agencies of the U.S. Department of Defense.
1. Scope member from the other over the adhered surfaces at a separa-
tionangleofapproximately180°andataseparationrateof152
1.1 This test method covers the determination of the com-
mm (6 in.)/min. It is expressed in kilograms per millimetre
parative peel or stripping characteristics of adhesive bonds
(pounds per inch) of width.
when tested on standard-sized specimens and under defined
conditions of pretreatment, temperature, and testing machine
4. Apparatus
speed.
4.1 Testing Machine—Apower-driven machine, with a con-
1.2 The values stated in SI units are to be regarded as the
stant rate-of-jaw separation or of the inclination balance or
standard. The values given in parentheses are for information
pendulum type, which fulfills the following requirements:
only.
4.1.1 The applied tension as measured and recorded is
1.3 This standard does not purport to address all of the
accurate within 61%.
safety concerns, if any, associated with its use. It is the
4.1.2 Hold specimens in the testing machine by grips which
responsibility of the user of this standard to establish appro-
clamp firmly and prevent slipping at all times.
priate safety and health practices and determine the applica-
4.1.3 The rate of travel of the power-actuated grip is 305
bility of regulatory limitations prior to use.
mm (12 in.)/min. This rate which provides a separation of 152
mm (6 in.)/min is to be uniform throughout the tests.
2. Referenced Documents
4.1.4 Operate the machine without any device for maintain-
2.1 ASTM Standards:
ing maximum load indication. In pendulum-type machines, the
D907 Terminology of Adhesives
weight lever swings as a free pendulum without engagement of
pawls.
3. Terminology
4.1.5 The machine is autographic giving a chart having the
3.1 Definitions—Many terms used in this test method are
inchesofseparationasoneaxisandappliedtensionastheother
defined in Terminology D907.
axis of coordinates.
3.2 Definitions of Terms Specific to This Standard:
4.1.6 The capacity of the machine is such that the maximum
3.2.1 flexible, n—in this test method, indicates a material of
applied tension during test does not exceed 85 % nor be less
the proper flexural strength and thickness to permit a turn back
than 15 % of the rated capacity.
at an approximate 180° angle in the expected loading range of
4.2 Conditioning Room or Desiccators—A conditioning
the test without failure. In order to fulfill all terms of the
room capable of maintaining a relative humidity of 50 62%
definition, at least one of the adhered materials must be
at 23 6 1°C (73.4 6 2°F), or desiccators filled with a saturated
flexible.
salt solution (Note 1) to give a relative humidity of 50 62%
3.2.2 peel or stripping strength, n—theaverageloadperunit
at 23 6 1°C are required for the conditioning of some
width of bond line required to separate progressively one
specimens.
NOTE 1—A saturated salt solution of calcium nitrate gives approxi-
mately 51 % relative humidity at the testing temperature.
This test method is under the jurisdiction of ASTM Committee D14 on
Adhesives and is the direct responsibility of Subcommittee D14.80 on Metal
Bonding Adhesives.
5. Test Specimen
Current edition approved Oct. 1, 2010. Published October 2010. Originally
5.1 The test specimen, shown in Fig. 1(a), consists of one
approved in 1946. Last previous edition approved in 2004 as D903 – 98 (2004).
DOI: 10.1520/D0903-98R10.
piece of flexible material, 25 by 304.8 mm (1 by 12 in.),
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
bonded for 152.4 mm (6 in.) at one end to one piece of flexible
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
or rigid material, 25 by 203.2 mm (1 by 8 in.), with the
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. unbonded portions of each member being face to face.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
D903 − 98 (2010)
so that five standard 25-mm (1-in.) wide specimens are
obtained from each panel.
7. Conditioning
7.1 Condition all specimens for 7 days by exposure to a
relative humidity of 50 6 2 % at 23 6 1°C (73.46 2°F) or
until equilibrium is reached, except where the adhesive manu-
facturer may specify such an aging period to be unnecessary or
a shorter period to be adequate.
7.2 Special conditioning procedures may be used by agree-
ment between the purchaser and the manufacturer.
8. Procedure
8.1 Conduct the test as soon as possible after removing the
test specimens from the conditioning atmosphere and prefer-
ably under the same conditions.
8.2 Separate the free end of the 25-mm (1-in.) wide flexible
memberbyhandfromtheothermemberforadistanceofabout
1in.Placethespecimeninthetestingmachinebyclampingthe
(a) Test Specimen (b) Specimens from Bonded Panel
free end of the 8-in. long member in one grip, turning back the
free end of the flexible member and clamping it in the other
Engli
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