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  1.0 Scope  This test method establishes a procedure fordetermining whether the adhesion of a polymer coating to aninorganic or ceramic substrate is above an adequate level. The substrate may or may not have an oxide layer on the sur-face. The test can be inverted and used for determining theadhesion of a metal coating to a polymer film. 2.0 Applicable Documents ASTM D 3330  Test Method for Peel Adhesion of Pressure-Sensitive Tape of 180 °  Angle ASTM D 3359  Standard Test Methods for Measuring Adhe-sion by Tape Test 3.0 Test Specimen  The test specimen shall consist of thecoated substrate. A control should also be prepared using amutually agreed upon material whose results from this test areknown, preferably a material with an adhesion classification of 5. At least 3 test specimens should be prepared for eachmaterial of interest. 4.0 Apparatus or Material4.1  25 mm [1.0 in] wide semitransparent pressure sensitivetape with an adhesion strength of 43  ±  6 g/mm [38  ±  5 oz/in]. The adhesion should not change more than 6.5% of its meanvalue within 12 months. 3M Scotch brand #600 tape hasbeen found to be acceptable for this test. 4.2  Rubber eraser on end of pencil. 4.3  A light source is helpful in determining if the cut hasbeen made all the way through the polymer to the substrate. 4.4  A closed boiling water bath. 5.0 Procedure5.1  Preparation of test specimen. Refer to ASTM D 3330and ASTM D 3359. 5.1.1  Prepare and clean the substrate according to themanufacturer’s recommended procedure. 5.1.2  Prime the surface with the manufacturer’s recom-mended adhesion promoter, if required. 5.1.3  Apply a 10  µ m to 25  µ m (measured after processingis complete) coating onto the surface of the substrate usingthe manufacturer’s recommended procedure. 5.2 Pattern Coating  The coating should be patternedaccording to the procedures outlined in section 4.2.5 of IPC-DD-135. The pattern consists of a 10 x 10 grid of 1 mm x 1mm squares separated by 100  µ m wide lines or pattern fea-tures, as illustrated in Figure 1. At least two complete gridsmust be patterned on the specimen, one for the initial test andone for the 3 hour test. 5.3 Test5.3.1  Remove two complete laps of tape and discard.Remove an additional length at a steady (not jerked) rate andcut a piece approximately 75 mm [3.0 in] long. 5.3.2  Place the center of the tape over one of the grid pat-terns and smooth into place by a finger. Rub the tape firmlywith the eraser on the end of the pencil to ensure good con-tact between the tape and the film. The color under the tapeis a good indicator of contact between the tape and the film. 2.4.1.6-01 Figure 1 1 mm100 µ m The Institute for Interconnecting and Packaging Electronic Circuits2215 Sanders Road ã Northbrook, IL 60062-6135 IPC-TM-650TEST METHODS MANUAL Number 2.4.1.6 Subject  Adhesion, Polymer Coating Date 7/95 RevisionOriginating Task Group Deposited Dielectric Task Group (C-13a) Material in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC. Page 1 of 2  5.3.3  Within 90 seconds of applying the tape, remove thetape with a steady motion by pulling at a 180 °  angle. 5.3.4  Inspect the lattice pattern under illumination forremoval of coating from the substrate. Rate the adhesion inaccordance with the following scale illustrated in Figure 2:ã5 The edges of the line patterns are completely smooth;none of the squares of the lattice are detached.ã4 Small flakes of the coating are detached at the intersectionof the lattice; less than 5% of the area is affected.ã3 Small flakes of the coating are detached along the edgesand at intersections of the lattice. The area affected is 5 to15% of the lattice.ã2 The coating has flaked along the edges and on parts of the squares. The area affected is 15 to 35% of the lattice.ã1 The coating has flaked along the edges of the line patternsin long ribbons and whole squares have detached. Thearea affected is 35 to 65% of the lattice.ã0 Greater than 65% of the lattice has detached. 5.3.5  Place the test specimens in a boiling water bath andstress the samples for 3 hours. The water in the boiling waterbath must completely cover the test specimens for the entire3 hours. A closed system that returns the steam as conden-sation is preferred. 5.3.6  Remove the test specimens from the boiling waterbath or environmental chamber and allow to cool to roomtemperature. 5.3.7  Wipe sample dry. Repeat steps 5.3.1-5.3.4 on thesecond (unused) grid pattern. 5.3.8  Report adhesion results for both the initial and 3 hourtests. 6.0  Notes  None 2.4.1.6-02 Figure 2 Classification 5None4321 0Greater than 65% Surface of cross-cut area from which flaking has occurred. (Example for six paralleled cuts) IPC-TM-650 Number 2.4.1.6 Subject  Adhesion, Polymer Coating Date 7/95 Revision Page 2 of 2
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