ASTM F1842-97
(Test Method)Standard Test Method for Determining Ink or Coating Adhesion on Plastic Substrates for Membrane Switch Applications
Standard Test Method for Determining Ink or Coating Adhesion on Plastic Substrates for Membrane Switch Applications
SCOPE
1.1 This test method is based on existing Test Method D3359, with modifications to make it suitable for plastic substrates and membrane switches.
1.2 Despite the problems associated with a tape test on plastic substrates, it is our belief that this is still one of the best ways to test ink and coating for adhesion for membrane switch applications. In writing this test method we are addressing several of the objections to the test method that could affect its precision and repeatability on plastic substrates.
1.3 These test methods cover whether the adhesion of coating or ink to a substrate is at an acceptable level. They do not distinguish between higher levels of adhesion, for which more sophisticated methods of measurement may be required.
NOTE 1 - It should be recognized that differences in adherability of the ink or coating surface can affect the results obtained with inks or coatings having the same inherent adhesion.
1.4 In multi-coat systems adhesion failure may occur between coats, so that the adhesion of the coating system to the substrate is not determined.
1.5 This test method is specifically designed for measuring adhesion of inks and coatings (films) that have a thickness of 5 mil (125 microns) or less, on plastics such as polyester and polycarbonate.
1.6 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: F 1842 – 97
Standard Test Method for
Determining Ink or Coating Adhesion on Plastic Substrates
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 (ϵ) indicates an editorial change since the last revision or reapproval.
1. Scope applied over the lattice and then removed, and adhesion is
evaluated by comparison with the descriptions and illustra-
1.1 This test method is based on existing Test Method
tions.
D 3359D 3359, with modifications to make it suitable for
plastic substrates and membrane switches.
4. Significance and Use
1.2 Despite the problems associated with a tape test on
4.1 If the ink or coating is to fulfill its function, it must
plastic substrates, it is our belief that this is still one of the best
adhere to the substrate. Substrates and their surface preparation
ways to test ink and coating for adhesion for membrane switch
have a significant effect on the adhesion of inks or coatings.
applications. In writing this test method we are addressing
Therefore, a method of evaluating adhesion of inks or coatings
several of the objections to the test method that could affect its
to different substrates or surface treatments, or of different inks
precision and repeatability on plastic substrates.
or coatings to the same substrate and surface treatment, is
1.3 These test methods cover whether the adhesion of
useful to the industry.
coating or ink to a substrate is at an acceptable level. They do
4.2 The limitations of all adhesion methods and the specific
not distinguish between higher levels of adhesion, for which
limitationofthistestmethodtolowerlevelsofadhesionshould
more sophisticated methods of measurement may be required.
be recognized before using it. The intra– and inter–laboratory
NOTE 1—It should be recognized that differences in adherability of the
precision of this test method is under evaluation.
ink or coating surface can affect the results obtained with inks or coatings
4.3 Printing area to be tested should be a solid area large
having the same inherent adhesion.
enough to include the entire cross hatch pattern.
1.4 In multi–coat systems adhesion failure may occur be-
5. Interferences
tween coats, so that the adhesion of the coating system to the
substrate is not determined.
The type of tape used should be compatible with the type of
1.5 This test method is specifically designed for measuring
inks used.
adhesion of inks and coatings (films) that have a thickness of
6. Apparatus
5 mil (125 microns) or less, on plastics such as polyester and
polycarbonate.
6.1 Cutting Tool—A multi–blade cutter having a cutting
1.6 This standard does not purport to address all of the
edge angle between 15 and 30 degrees that will make six cuts
safety concerns, if any, associated with its use. It is the
at once that are 2 mm apart. It is of particular importance that
responsibility of the user of this standard to establish appro-
the cutting edges be in good condition.
priate safety and health practices and determine the applica-
NOTE 2—Dull cutting edges require more pressure on the tool, which
bility of regulatory limitations prior to use.
increases the difficulty in controlling the depth of the cuts. Dull edges can
also rupture or chip the substrate, ink, or coating and thus yield
2. Referenced Documents
inconsistent or inaccurate results.
2.1 ASTM Standards:
6.2 Tape—One inch (25 mm) wide clear or semi–transpar-
D 3359 Test Methods for Measuring Adhesion by Tape
ent pressure sensitive tape with an adhesion strength agreed
Test.
upon by the supplier and the user is needed. Because of the
variability in adhesion strength from batch–to–batch and with
3. Summary of Test Method
time, it is essential that tape from the same batch be used when
3.1 A lattice pattern with six cuts in each direction is made
tests are to be run in different laboratories. If this is not
in the ink or coating to the substrate. Pressure sensitive tape is
possible, the test method should be used only for ranking a
series of test coatings.
This practice is under the jurisdiction ofASTM Committee F–1 on Electronics
6.3 Illumination and Magnification—This is helpful in or-
and is the direct responsibility of Subcommittee F01.18 on Membrane Switches.
der to determine if the cuts have been made through the inks
Current edition approved Dec. 10, 1997. Published February 1998.
and or coatings.
Annual Book of ASTM Standards, Vol 06.01.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Please contact ASTM I
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