ASTM F1842-02

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Designation: F 1842 – 02
Standard Test Method for
Determining Ink or Coating Adhesion on Plastic Substrates
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for Membrane Switch Applications
This standard is issued under the fixed designation F 1842; 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. Scope 3. Terminology
1.1 This test method is based on existing Test Method 3.1 membrane switch—a momentary switching device in
D 3359, with modifications to make it suitable for plastic which at least one contact is on, or made of, a flexible
substrates and membrane switches. substrate.
1.2 Despite the problems associated with a tape test on
4. Summary of Test Method
plastic substrates, it is our belief that this is still one of the best
4.1 A lattice pattern with six cuts in each direction is made
ways to test ink and coating for adhesion for membrane switch
applications. In writing this test method we are addressing in the ink or coating to the substrate. Pressure sensitive tape is
applied over the lattice and then removed, and adhesion is
several of the objections to the test method that could affect its
precision and repeatability on plastic substrates. evaluated by comparison with the descriptions and illustra-
tions.
1.3 These test methods cover whether the adhesion of
coating or ink to a substrate is at an acceptable level. They do
5. Significance and Use
not distinguish between higher levels of adhesion, for which
5.1 If the ink or coating is to fulfill its function, it must
more sophisticated methods of measurement may be required.
adhere to the substrate. Substrates and their surface preparation
NOTE 1—It should be recognized that differences in adherability of the
have a significant effect on the adhesion of inks or coatings.
ink or coating surface can affect the results obtained with inks or coatings
Therefore, a method of evaluating adhesion of inks or coatings
having the same inherent adhesion.
to different substrates or surface treatments, or of different inks
1.4 In multi–coat systems adhesion failure may occur be-
or coatings to the same substrate and surface treatment, is
tween coats, so that the adhesion of the coating system to the
useful to the industry.
substrate is not determined.
5.2 The limitations of all adhesion methods and the specific
1.5 This test method is specifically designed for measuring
limitationofthistestmethodtolowerlevelsofadhesionshould
adhesion of inks and coatings (films) that have a thickness of
be recognized before using it. The intra– and inter–laboratory
5 mil (125 microns) or less, on plastics such as polyester and
precision of this test method is under evaluation.
polycarbonate.
5.3 Printing area to be tested should be a solid area large
1.6 This standard does not purport to address all of the
enough to include the entire cross hatch pattern.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
6. Interferences
priate safety and health practices and determine the applica-
The type of tape used should be compatible with the type of
bility of regulatory limitations prior to use.
inks used.
2. Referenced Documents
7. Apparatus
2.1 ASTM Standards:
7.1 Cutting Tool—A multi–blade cutter having a cutting
D 3359 Test Methods for Measuring Adhesion by Tape
edge angle between 15 and 30 degrees that will make six cuts
2
Test
at once that are 2 mm apart. It is of particular importance that
the cutting edges be in good condition.
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This practice is under the jurisdiction ofASTM Committee F01 on Electronics
NOTE 2—Dull cutting edges require more pressure on the tool, which
and is the direct responsibility of Subcommittee F01.18 on Membrane Switches.
increases the difficulty in controlling the depth of the cuts. Dull edges can
Current edition approved Dec. 10, 2002. Published February 2002. Originally
also rupture or chip the substrate, ink, or coating and thus yield
approved in 1997. Last previous edition approved in 1997 as F 1842–97.
2
inconsistent or inaccurate results.
Annual Book of ASTM Standards, Vol 06.01.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
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F1842–02
7.2 Tape—One inch (25 mm) wide clear or semi–transpar- place by a finger. To ensure good contact with the ink or
ent pressure sensitive tape with an adhesion strength agreed coating, press tape firmly to thoroughly wet the adhesive to the
upon by the supplier and the user is needed. Because of the surface of the ink or coating. The color under the tape is a
varia
...