ASTM D4338-97(2011)e1

Standard Test Method for Flexibility Determination of Supported Adhesive Films by Mandrel Bend

SIGNIFICANCE AND USE
The mandrel bend test is simple and fast. It requires little investment in equipment and little operator training. The prime purpose is to determine whether a film of adhesive coated on a substrate meets flexibility requirements. The test is also useful for comparing flexibility of adhesives. It can be used to design adhesives by comparing the flexibility of various formulations to meet specific end-use parameters. The adhesive flexibility can be determined at temperatures other than ambient by conditioning the test apparatus and test specimen at the desired temperature and performing the test under those conditions.
SCOPE
1.1 This test method covers the determination of the flexibility of an adhesive film bonded to a flexible substrate. The results are useful for comparing flexibility of adhesives and not for absolute characterization of adhesives.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are provided for information purposes 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

• Status: Historical
• Publication Date: 31-Mar-2004
• ICS: 83.180 - Adhesives
• Technical Committee: D14 - Adhesives
• Drafting Committee: D14.10 - Working Properties

Relations

• Replaces: ASTM D4338-97(2004) - Standard Test Method for Flexibility Determination of Supported Adhesive Films by Mandrel Bend
• Effective Date: 01-Apr-2004

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
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Designation: D4338 − 97(Reapproved 2011)
Standard Test Method for
Flexibility Determination of Supported Adhesive Films by
Mandrel Bend
This standard is issued under the fixed designation D4338; 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.
ε NOTE—Units of measure were editorially changed from hard to soft conversions in Section 7 and a typo was corrected
in Footnote 3 in April 2011.
1. Scope 3. Terminology
3.1 Definitions—For terms used in this standard, refer to
1.1 This test method covers the determination of the flex-
ibility of an adhesive film bonded to a flexible substrate. The Terminology D907.
results are useful for comparing flexibility of adhesives and not
3.2 Definitions of Terms Specific to This Standard:
for absolute characterization of adhesives.
3.2.1 mandrel, n—cylindrical rod.
1.2 The values stated in SI units are to be regarded as the
4. Summary of Test Method
standard. The values given in parentheses are provided for
information purposes only.
4.1 Atest substrate coated with a film of adhesive, properly
sized and conditioned, is folded to form an inverted U-shaped
1.3 This standard does not purport to address all of the
angle over the mandrel maintaining intimate contact with the
safety concerns, if any, associated with its use. It is the
non-adhesive side. Using a fresh specimen for each test, the
responsibility of the user of this standard to establish appro-
test is repeated with progressively smaller diameter mandrels
priate safety and health practices and determine the applica-
until the adhesive fails (cracks) on bending. The flexibility
bility of regulatory limitations prior to use.
value of the adhesive is the smallest diameter mandrel over
which four out of five test specimens do not break.
2. Referenced Documents
2.1 ASTM Standards:
5. Significance and Use
D609 Practice for Preparation of Cold-Rolled Steel Panels
5.1 Themandrelbendtestissimpleandfast.Itrequireslittle
for Testing Paint, Varnish, Conversion Coatings, and
investment in equipment and little operator training.The prime
Related Coating Products
purpose is to determine whether a film of adhesive coated on a
D907 Terminology of Adhesives
substrate meets flexibility requirements. The test is also useful
D3111 Test Method for Flexibility Determination of Hot-
for comparing flexibility of adhesives. It can be used to design
Melt Adhesives by Mandrel Bend Test Method
adhesives by comparing the flexibility of various formulations
E171 Practice for Conditioning and Testing Flexible Barrier
to meet specific end-use parameters. The adhesive flexibility
Packaging
can be determined at temperatures other than ambient by
conditioning the test apparatus and test specimen at the desired
temperature and performing the test under those conditions.
This test method is under the jurisdiction of ASTM Committee D14 on
Adhesives and is the direct responsibility of Subcommittee D14.10 on Working
6. Apparatus
Properties.
6.1 The test apparatus consists of a series of different
Current edition approved April 1, 2011. Published April 2011. Originally
approved in 1984. Last previous edition approved in 2004 as D4338 – 97 (2004).
diameter cylindrical rods or mandrels supported at each end.
DOI: 10.1520/D4338-97R11E01.
These should be long enough to permit placement of the flat
This test method is intended to replace Method 1081 of Federal Test
side of a test specimen tangentially at right angles to the
Method 175A. Available from Standardization Documents Order Desk, DODSSP,
longitudinal axis of the test mandrel. Individual requirements
Bldg. 4, Section D, 700 Robbins Ave., Philadelphia, PA 19111-5098, http://
dodssp.daps.dla.mil.
determine the diameter and lengths of the rods needed. For
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
1 1
most tests, rods 3.2 mm ( ⁄8 in.), 6.4 mm ( ⁄4 in.), and 12.8 mm
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
( ⁄2 in.) in diameter, by 75 to 150 mm (3 to 6 in.) in length,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. made of brass or stainless steel, are satisfactory. Two simple
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D4338 − 97 (2011)
NOTE 1—Figures in parentheses are approximate.
FIG. 1 Test Mandrel (Various Diameters) for Test Frame
test frames are shown in Fig. 1, one with fixed mandrels, and the adhesive to be tested. An alternative to these steel test
the other designed to take any diameter mandrel. panels can be bonderized steel panels as available commer-
cially.
6.2 Test Support Panels, unless otherwise specified, are
6.2.2 Although steel is used in this test method, other
made of steel, not thinner than 0.25 mm (0.010 in.) nor thicker
flexible support substrates can be used, including other metals,
than 0.40 mm (0.016 in.).
plastics, and paper. Special surface preparation, for example,
6.2.1 The steel test panels are to be free of rust, corrosion,
priming, corona discharge, and etching, can be defined for
and contamination. Prepare one face of each panel to a clean
these substrates before coating the adhesive.
surface according to Methods D609 to allow better adhesion of
6.3 Device, capable of producing adhesive coatings of
uniform thickness withi
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