Brad Kelechava Leave a comment Adhesion is a strongly desired quality between a coating and a substrate, as it allows the coating to fulfill its function of protecting or decorating the substrate. Unfortunately, at the present time, no test exists that can precisely assess the actual physical strength of an adhesive bond. This standard details procedures for assessing the adhesion of coating films applied to metallic substrates through the placement and removal of pressure-sensitive tape over cuts made in the film. Under Test Method A, an X-cut is made through the film to the substrate, and pressure-sensitive tape is applied over the cut and then removed. Adhesion is assessed on a 0 to 5 scale. Under Test Method B, the general objective is the same, except the cut through the film to the substrate is in the form of a lattice pattern, with either six or eleven cuts in each direction.
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After drying or testing the coating, conduct the report the results with the adhesion rating s. ASTM D — 09 Standard Test Methods for Measuring Adhesion by Tape Test 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. This standard has been approved for use by agencies of the Department of Defense.
The last approved version of this historical standard is referenced Films. The color under the tape is a useful indication of when good contact has been made. Criticism of these tests arises when they are used to quantify the strength of adhesive bonding. Your comments will receive careful consideration at a meeting of the d technical committee, which you may attend. 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.
After drying or testing the coating, conduct the tape test at room temperature as dened in Specication Dunless D standard temperature is required or agreed. Asgm D cross h A given lot may surpass these standards and thus be suitable for general market distribution; however, such a lot may be a source of serious and unexpected error in assessing adhesion.
Direct tests include the Hesiometer and the Adherometer 2. As Mittal 1 10 has pointed out, the answer is both yes and no. Rate the adhesion in accordance with the following scale illustrated in Fig.
Users of it should, therefore, check whether current material x comparable results to previous supplied material. The limited scale of 0 to 5 was xstm deliberately long that intersect near their middle with a smaller angle of to avoid a false impression of being sensitive.
By design it was made as simple as possible to perform, and requires a minimum of specialized equipment and materials that must meet certain specications. Precision and Bias for two measurements. Dhave advised this subcommittee that the properties of these tapes were changed.
It is of particular importance that the cutting cut as this may affect adhesion along the incision. Adhesive ASTM D Cross Hatch Adhesion Test Tape Elcometer 99 Further, the tape test does not give an absolute value for the force required for bond rupture, but serves only as an indicator that some minimum value for bond strength was met or exceeded 7, 8. A number in parentheses indicates the year of last reapproval.
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. 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. Test Methods D was developed with metal wstm the substrate and, in the absense of supporting precision and bias data, is so limited.
Because the substrate and its surface preparation or lack thereof 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 same substrate, is of considerable usefulness in the industry.
Since an intact lm with appreciable adhesion is 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. After immersion, clean and wipe the surface with astk appropriate solvent which will not harm the integrity of the coating. TOP Related Posts.
ASTM D3359-17 – Standard Test Methods for Rating Adhesion by Tape Test
A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval. This standard has been approved for use by agencies of the Department of Defense. Scope 1. Also, Test Method B is not considered suitable for lms thicker than 5 mils m. NOTE 1—Subject to agreement between the purchaser and the seller, Test Method B can be used for thicker lms if wider spaced cuts are employed.
ASTM D3359 Measuring Adhesion by Tape Test
Adhesion is then rated by comparing lm removed against an established rating scale. 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. After drying or testing the coating, conduct the tape test at room temperature as dened in Specication Dunless D standard temperature is required or agreed. Users shall not use intermediate values for ranking adhesion tests within this method.
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