ASTM D4338-97(2004)
(Test Method)Standard Test Method for Flexibility Determination of Supported Adhesive Films by Mandrel Bend
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.
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Standards Content (Sample)
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Designation:D4338–97(Reapproved2004)
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 Department of Defense.
1. Scope 4. Summary of Test Method
1.1 This test method covers the determination of the flex- 4.1 Atest substrate coated with a film of adhesive, properly
ibility of an adhesive film bonded to a flexible substrate. The sized and conditioned, is folded to form an inverted U-shaped
results are useful for comparing flexibility of adhesives and not angle over the mandrel maintaining intimate contact with the
for absolute characterization of adhesives. non-adhesive side. Using a fresh specimen for each test, the
1.2 The values stated in SI units are to be regarded as the test is repeated with progressively smaller diameter mandrels
standard. The values given in parentheses are provided for until the adhesive fails (cracks) on bending. The flexibility
information purposes only. value of the adhesive is the smallest diameter mandrel over
1.3 This standard does not purport to address all of the which four out of five test specimens do not break.
safety concerns, if any, associated with its use. It is the
5. Significance and Use
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica- 5.1 Themandrelbendtestissimpleandfast.Itrequireslittle
investment in equipment and little operator training.The prime
bility of regulatory limitations prior to use.
purpose is to determine whether a film of adhesive coated on a
2. Referenced Documents
substrate meets flexibility requirements. The test is also useful
2.1 ASTM Standards: for comparing flexibility of adhesives. It can be used to design
D609 Practice for Preparation of Cold-Rolled Steel Panels adhesives by comparing the flexibility of various formulations
for Testing Paint, Varnish, Conversion Coatings, and to meet specific end-use parameters. The adhesive flexibility
Related Coating Products can be determined at temperatures other than ambient by
D907 Terminology of Adhesives conditioning the test apparatus and test specimen at the desired
D3111 Test Method for Flexibility Determination of Hot- temperature and performing the test under those conditions.
Melt Adhesives by Mandrel Bend Test Method
6. Apparatus
E171 Specification for Atmospheres for Conditioning and
Testing Flexible Barrier Materials 6.1 The test apparatus consists of a series of different
diameter cylindrical rods or mandrels supported at each end.
3. Terminology
These should be long enough to permit placement of the flat
3.1 Definitions— For terms used in this standard, refer to side of a test specimen tangentially at right angles to the
Terminology D907. longitudinal axis of the test mandrel. Individual requirements
3.2 Definitions of Terms Specific to This Standard: determine the diameter and lengths of the rods needed. For
1 1
3.2.1 mandrel, n—cylindrical rod. most tests, rods 3.2 mm ( ⁄8 in.), 6.4 mm ( ⁄4 in.), and 12.8 mm
( ⁄2 in.) in diameter, by 75 to 150 mm (3 to 6 in.) in length,
made of brass or stainless steel, are satisfactory. Two simple
This test method is under the jurisdiction of ASTM Committee D14 on
test frames are shown in Fig. 1, one with fixed mandrels, and
Adhesives and is the direct responsibility of Subcommittee D14.10 on Working
the other designed to take any diameter mandrel.
Properties.
6.2 Test Support Panels, unless otherwise specified, are
Current edition approved April 1, 2004. Published April 2004. Originally
published approved in 1984. Last previous edition approved in 1997 as D4338 – 97.
made of steel, not thinner than 0.25 mm (0.010 in.) nor thicker
DOI: 10.1520/D4338-97R04.
than 0.40 mm (0.016 in.).
This test method is intended to replace Method 1081 of Federal Test
6.2.1 The steel test panels are to be free of rust, corrosion,
Method 175A. Available from Naval Publications and Forms Center, 5801 Tabor
Ave., Philadelphia, PA 19120. and contamination. Prepare one face of each panel to a clean
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 Paul N. Gardnec Company, Inc., 313 NE 1st St. Pompano
the ASTM website. Beach, FL 33060.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D4338–97 (2004)
NOTE 1—Figures in parentheses are approximate.
FIG. 1 Test Mandrel (Various Diameters) for Test Frame
surface according to Methods D609 to allow better adhesion of 7. Sampling, Test Specimens, and Test Units
the adhesive to be tested. An alternative to these steel test
7.1 The test sample will be representative of the adhesive
panels can be bonderized steel panels as available commer-
tested.
cially.
7.2 Measure substrate,
6.2.2 Although steel is used in this test method, other
7.3 Prepare test coating as follows:
flexible support substrates can be used, including other metals,
plastics, and pap
...
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