Designation: D – 02 Standard Test Methods for Measuring Adhesion by Tape Test1 This standard is issued under the?xed designation D. ASTM D Uploaded by. Leonardo Gonçalves. Loading Preview. Sorry, preview is currently unavailable. You can download the paper by clicking the. ASTM D Pull Off Test Standard. Uploaded by. vlong ASTM D MEK Test (Zinc Test). Uploaded by. vlong ASTM D Eng Cross-cut.
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Dhave advised this subcommittee that the properties of these tapes were changed.
D5 Creation Powered by: These test methods were designed for relatively ductile coatings applied to metal substrates, not for coatings often brittle applied to plastic parts 7. A number in parentheses indicates the year of last reapproval. Cohesive failure within the coating? However, with the tape test, failures within the substrate or coating layers are rare because the tape adhesive is not usually strong enough to exceed the cohesive strengths of normal substrates and organic coatings.
Because of the variability in adhesion strength from batch-to-batch and with time, it is essential that tape from the same batch be used when tests are to be run in different laboratories. Differences in tapes used can lead to different results as small changes in backing stiffness and adhesive rheology cause large changes in the tension area.
The unique functional requirements of coatings on plastic substrates cause the usual tape tests to be unsatisfactory for measuring adhesion performance in practice. For large structures make sufficient tests to ensure that the adhesion evaluation is representative of the whole surface. As Mittal 1 12 has pointed out, the wstm is both yes and no.
Common methods which approach the direct tests are peel, lapshear, and tensile tests. These effects are related as they re? In actuality, however, this force is distributed over 359-02 discrete distance O-A in Fig.
In its simplest version a piece of adhesive tape is pressed against the paint? Then dry or prepare the surface, or both, as agreed upon between the purchaser and the seller. If the substrate has not been reached make another X in a different location. One supplier that has assisted in the re? If the peel angle and rate vary, the force required to remove the tape can change dramatically.
Procedure for A-X-CUT TAPE TEST METHOD-ASTM D
Precision and Bias 8 Your comments will receive careful consideration at a meeting of the responsible technical committee,1 which you may attend.
Key steps that directly re? After immersion, clean and wipe the surface with an appropriate solvent which will not harm the integrity of the coating. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.
After immersion, clean and wipe the surface with an appropriate solvent which will not harm the integrity of the coating. Also, because tapes change on storage, bond strengths of the tape may change over time 7, 8.
Because the substrate and its surface preparation or lack of it have a drastic effect on the adhesion of coatings, a method to evaluate adhesion of a coating to different substrates or surface treatments, or of different coatings to the 2 3 1.
Both test methods are used to establish whether the adhesion of a coating to a substrate is at an adequate level; however they do not distinguish between higher levels of adhesion for which more sophisticated methods of measurement are required.
It is not unexpected that different operators might obtain different results 7, 8. The limited scale of 0 to 5 was selected deliberately to avoid a false impression of being sensitive.
Posted in Powder Coating Asttm Tags: When making successive single cuts with the aid of a guide, place the guide on the uncut area. It is of particular importance that the cutting edges be in good condition.
Procedure for X-CUT TAPE TEST METHOD-ASTM D3359-02
Criteria deemed essential for a test to warrant large-scale acceptance are: The central issues are that the test on plastics lacks reproducibility and does not relate to the intended application.
There generally is difficulty, however, in relating these tests to basic adhesion phenomena.
Extremes in temperature or relative humidity may affect the astj of the tape or the coating. More importantly, in this instance the test is being applied beyond its intended scope.