ASTM D assesses the adhesion of film coatings to metallic substrates by applying and removing pressure-sensitive tape over cuts made in the film. Documents Similar To ASTM D Eng Cross-cut. ISO Uploaded by. Quang Duan Nguyen · ISO Uploaded by. Anonymous n4bJbeLAq. This product is ASTM D compliant. Proven to be a very close equivalent to the Permacel P99 tape which was withdrawn from production by the.
Historical Version s – view previous versions of standard Translated Version s: As such, no single tape is likely to be suitable for testing all coatings. Atm and Bias 6 9. Major limitations of the tape test are its low sensitivity, applicability only to coatings of relatively low bond strengths, and non-determination of adhesion to the substrate where failure occurs within a single coat, as when testing primers alone, or within or between coats in multicoat systems.
Issues with plastic substrates are noted in Appendix X1. If this is not possible the test method should be used only for ranking a series of test coatings. For lms thicker than 5 mils muse Test Method A.
If the substrate has not been reached make another X in a different location. It is of particular importance that the cutting edge or edges be in good condition. A number in parentheses indicates the year of last reapproval.
A similar test method, ISOpermits tests on non-metallic substrates for example, wood and plaster. Historical Version s – view previous versions of standard.
It is assumed that coating removal occurs when the tensile force generated along the latter interface, which is a function of the rheological properties of the backing and adhesive layer materials, is greater than the bond strength at the coating-substrate interface or cohesive strength of the coating.
Precision and bias data on the later is lacking. A signicant compressive force arises from the response of the tape backing material to being stretched. If testing coatings on non-metallic substrates, either Test Method A or Test Method B may be more appropriate and the method employed should be discussed by interested parties. Criticism of these tests arises when they are used to quantify the strength of adhesive bonding. To ensure good contact with the lm rub the tape rmly with the eraser on the end of a pencil.
Test Methods D was developed with metal as the substrate and, in the absence of supporting precision and bias data, is so limited. They do not distinguish between higher levels of adhesion for which more sophisticated methods of measurement are required.
The color under the tape is a useful indication of when good contact has been made. A number in parentheses indicates the year of last reapproval. After sion conditions and method of sample preparation. Rate the adhesion in accordance with the following scale illustrated in Fig. Apparatus and Materials Current edition approved June 1, Precision and Bias 6 dry or prepare the surface, or both, as agreed upon between the 9. The values given in parentheses are for information only.
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.
These effects are related as they reect certain rheological properties of the qstm and adhesive that are molecular in origin. Criteria deemed essential for a test to warrant large-scale acceptance are: Dhave advised this subcommittee that the properties of these tapes were changed. Further, the tape test does not give an absolute value for the force required for bond rupture, but serves only as astn indicator that some minimum value for bond strength was met or exceeded 7, 8.
The coating has aked along the edges and on parts of the squares.
99 Adhesive ASTM D Tape (KM)
A given lot may surpass these standards and thus be f3359-09 for general market distribution; however, such a lot may be a source of serious and unexpected error in assessing adhesion. Summary of Test Methods 3. Do not attempt to deepen a previous cut as this may affect adhesion along the incision. While this may be an agreement between purchaser and seller, the precision values given in Issues with plastic substrates are noted in Appendix X1.
NOTE 5—Coatings should be applied in accordance with Practice Dor as agreed upon between the purchaser and the seller.
NOTE 3—It should be recognized that differences in adherability of the coating surface can affect the results obtained with coatings having the same inherent adhesion. ASTM D cross h Justication for the cutting step is reasonable as cutting provides a free edge from which peeling can begin without having to overcome the cohesive strength of the coating layer.
But it can also be said that it is possible to obtain an indication of relative adhesion performance. Variation in pull rate and peel angle can effect large differences in test values and must be minimized to assure reproducibility 3.
After immersion, clean and wipe the surface with an appropriate solvent which will not harm the integrity of the coating.
Some commercial tapes are manufactured to meet minimum standards. Dhave advised this subcommittee that the properties of these tapes were changed. The conditions and time of decorating a substrate, it must adhere to it for the expected exposure will be governed by ultimate coating use or shall be agreed upon service life. Since an intact lm with appreciable adhesion ast frequently not removed at all, the severity of the test is usually enhanced by cutting into the lm a gure X or a cross hatched pattern, before applying and removing the tape.
There generally is difficulty, however, in relating these tests to basic adhesion phenomena.
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
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