1、Designation: F 1842 02Standard Test Method forDetermining Ink or Coating Adhesion on Plastic Substratesfor Membrane Switch Applications1This standard is issued under the fixed designation F 1842; the number immediately following the designation indicates the year oforiginal adoption or, in the case
2、of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method is based on existing Test MethodD 3359, with modifications to make it suita
3、ble for plasticsubstrates and membrane switches.1.2 Despite the problems associated with a tape test onplastic substrates, it is our belief that this is still one of the bestways to test ink and coating for adhesion for membrane switchapplications. In writing this test method we are addressingsevera
4、l of the objections to the test method that could affect itsprecision and repeatability on plastic substrates.1.3 These test methods cover whether the adhesion ofcoating or ink to a substrate is at an acceptable level. They donot distinguish between higher levels of adhesion, for whichmore sophistic
5、ated methods of measurement may be required.NOTE 1It should be recognized that differences in adherability of theink or coating surface can affect the results obtained with inks or coatingshaving the same inherent adhesion.1.4 In multicoat systems adhesion failure may occur be-tween coats, so that t
6、he adhesion of the coating system to thesubstrate is not determined.1.5 This test method is specifically designed for measuringadhesion of inks and coatings (films) that have a thickness of5 mil (125 microns) or less, on plastics such as polyester andpolycarbonate.1.6 This standard does not purport
7、to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 3359 T
8、est Methods for Measuring Adhesion by TapeTest23. Terminology3.1 membrane switcha momentary switching device inwhich at least one contact is on, or made of, a flexiblesubstrate.4. Summary of Test Method4.1 A lattice pattern with six cuts in each direction is madein the ink or coating to the substrat
9、e. Pressure sensitive tape isapplied over the lattice and then removed, and adhesion isevaluated by comparison with the descriptions and illustra-tions.5. Significance and Use5.1 If the ink or coating is to fulfill its function, it mustadhere to the substrate. Substrates and their surface preparatio
10、nhave a significant effect on the adhesion of inks or coatings.Therefore, a method of evaluating adhesion of inks or coatingsto different substrates or surface treatments, or of different inksor coatings to the same substrate and surface treatment, isuseful to the industry.5.2 The limitations of all
11、 adhesion methods and the specificlimitation of this test method to lower levels of adhesion shouldbe recognized before using it. The intra and interlaboratoryprecision of this test method is under evaluation.5.3 Printing area to be tested should be a solid area largeenough to include the entire cro
12、ss hatch pattern.6. InterferencesThe type of tape used should be compatible with the type ofinks used.7. Apparatus7.1 Cutting ToolA multiblade cutter having a cuttingedge angle between 15 and 30 degrees that will make six cutsat once that are 2 mm apart. It is of particular importance thatthe cuttin
13、g edges be in good condition.NOTE 2Dull cutting edges require more pressure on the tool, whichincreases the difficulty in controlling the depth of the cuts. Dull edges canalso rupture or chip the substrate, ink, or coating and thus yieldinconsistent or inaccurate results.1This practice is under the
14、jurisdiction of ASTM Committee F01 on Electronicsand is the direct responsibility of Subcommittee F01.18 on Membrane Switches.Current edition approved Dec. 10, 2002. Published February 2002. Originallyapproved in 1997. Last previous edition approved in 1997 as F 184297.2Annual Book of ASTM Standards
15、, Vol 06.01.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.2 TapeOne inch (25 mm) wide clear or semitranspar-ent pressure sensitive tape with an adhesion strength agreedupon by the supplier and the user is needed. Because of theva
16、riability in adhesion strength from batchtobatch and withtime, it is essential that tape from the same batch be used whentests are to be run in different laboratories. If this is notpossible, the test method should be used only for ranking aseries of test coatings.7.3 Illumination and MagnificationT
17、his is helpful in or-der to determine if the cuts have been made through the inksand or coatings.8. Test Specimen8.1 The specimen is the printed or coated structure on whichadhesion is to be evaluated. The area to be tested should havegood planarity since warpage, waviness, or curvature mayseriously
18、 affect test results.8.2 Laminate the test specimen to a rigid substrate to meetthe requirements of 8.1 and 9.1.8.3 Condition the test specimen at 23 6 2C (73.4 6 3.6F)and 20 to 80 % relative humidity for 24 h. This is to ensure thatinks and coatings achieve full adhesion before the test isconducted
19、.9. Procedure9.1 Place specimen on flat, smooth, hard surface.9.2 With the cutting tool, make a cut approximately34 in.(20 mm) long. Cut through the ink or coating to the substratein one steady motion using just sufficient pressure on the toolto penetrate the ink or coating. Particular attention sho
20、uld bepaid to ensuring that pressure is applied evenly across all sixcutting edges.9.3 Make a second cut perpendicular to the first in order toachieve a grid pattern.9.4 Remove loose particles from the test area.9.5 Remove two complete laps of tape and discard. Removean additional length at a steady
21、 (not jerked) rate and cut a pieceabout 3 in. (75 mm) long.9.6 Place the center of the tape over the grid with the tapeoriented in the direction of one of the cuts and smooth intoplace by a finger. To ensure good contact with the ink orcoating, press tape firmly to thoroughly wet the adhesive to the
22、surface of the ink or coating. The color under the tape is auseful indication of when good contact has been made.9.7 Within 90 6 15 s of application, remove the tape byseizing the free end and pulling rapidly (not jerking) back uponitself at as close to an angle of 180 as possible. Ensurespecimen re
23、mains flat and in contact with the base surface.9.8 Inspect grid area for removal of ink or coating. Rateadhesion according to the scale in Fig. 1:Grade 5The edges of the cuts are completely smooth; none of the squaresof the lattice is detached.Grade 4Small flakes of the coating are detached at inte
24、rsections; less than5 % of the area is affected.Grade 3Small flakes of the coating are detached along edges and at inter-sections of cuts. The area affected is 5 to 15 % of the lattice.Grade 2The coating has flaked along the edges and on parts of the squares.The area affected is 15 to 35 % of the la
25、ttice.Grade 1The coating has flaked along the edges of cuts in large ribbons andwhole squares have detached. The area affected is 35 to 65 % ofthe lattice.Grade 0Flaking and detachment worse than Grade 1.10. Report10.1 Report the number of tests and for each test theresulting classification of each
26、where the failure occurred, thatis, between first coat and substrate, between first and secondcoat, and so on.10.2 Report the substrate employed, the type of ink orcoating, and the method of cure.10.3 If the adhesion strength of the tape has not beendetermined, report the specific tape used and its
27、manufacturer.10.4 Report the location of the test, and type of test (ink toink or ink to substrate).11. Precision and Bias11.1 The precision and bias of this test is under investiga-tion.12. Keywords12.1 adhesion, tape; adhesion test methodcrosscut; adhe-sion test methodcrosshatch; adhesion test met
28、hodtape;coatings; inks; membrane switchF1842022ASTM International takes no position respecting the validity of any patent rights asserted in connection with any item mentionedin this standard. Users of this standard are expressly advised that determination of the validity of any such patent rights,
29、and the riskof infringement of such rights, are entirely their own responsibility.This standard is subject to revision at any time by the responsible technical committee and must be reviewed every five years andif not revised, either reapproved or withdrawn. Your comments are invited either for revi
30、sion of this standard or for additional standardsand should be addressed to ASTM International Headquarters. Your comments will receive careful consideration at a meeting of theresponsible technical committee, which you may attend. If you feel that your comments have not received a fair hearing you
31、shouldmake your views known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).FIG. 1 Classification of Adhesion Test ResultsF1842023
