More D 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. The intra- and inter-laboratory precision of this test method is similar to other test methods for coated substrates for example, Test Method D and Test Method D , and is insensitive to all but large differences in adhesion. Limiting the range of rankings from 0 to 5 reflects the inability of this test method to make fine distinctions between levels of adhesion.
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A number in parentheses indicates the year of last reapproval. NOTE 1—This test method has been reported being used to measureadhesion of organic coatings on soft substrates for example, wood andplastic. Issues with plastic substrates are noted in Appendix X1.
Asimilartest method, ISO , permits tests on soft substrates for example, woodand plaster. Precision and bias data on the later is lacking. Test MethodsD was developed with metal as the substrate and, in the absence ofsupporting precision and bias data, is so limited. NOTE 2—Subject to agreement between the purchaser and the seller,Test Method B can be used for thicker films if wider spaced cuts areemployed.
They do not distinguish between higher levels ofadhesion for which more sophisticated methods of measure-ment are required. NOTE 3—It should be recognized that differences in adherability of thecoating surface can affect the results obtained with coatings having thesame inherent adhesion.
The values given in parentheses are for informationonly. It is the responsibilityof the user of this standard to establish appropriate safety andhealth practices and determine the applicability of regulatorylimitations prior to use. Referenced Documents2. Current edition approved June 1, Published June Originallyapproved in Last previous edition approved in as D — United States Summary of Test Methods3. Significance and Use4. 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 differentsubstrates or surface treatments, or of different coatings to thesame substrate and treatment, is of considerable usefulness inthe industry.
The intra- andinter-laboratory precision of this test method is similar to otherwidely-accepted tests for coated substrates for example, TestMethod D and Test Method D , but this is partly theresult of it being insensitive to all but large differences inadhesion.
The limited scale of 0 to 5 was selected deliberatelyto avoid a false impression of being sensitive. Apparatus and Materials5.
It is of particular importance that the cuttingedges be in good condition. Because of the variability inadhesion strength from batch-to-batch and with time, it isessential that tape from the same batch be used when tests areto be run in different laboratories. If this is not possible the testmethod should be used only for ranking a series of testcoatings. NOTE 4—Permacel P99 tape, previously identified as suitable for thispurpose, was withdrawn from manufacture in July Current suppliesof Permacel 99 on the market at this time have a shelf life that runs out inJuly Subcommittee D Alternative tapeswith specifications similar to that of Permacel P99 tape are available.
Users of alternative tapes should check whether the alternative tapes givecomparable results to the Permacel P99 tape. If more information isrequired about the tapes being evaluated in the D Test Specimens6.
NOTE 6—Coatings should be applied in accordance with Practice D,or as agreed upon between the purchaser and the seller. NOTE 7—If desired or specified, the coated test panels may be subjectedto a preliminary exposure such as water immersion, salt spray, or highhumidity before conducting the tape test. The conditions and time ofexposure will be governed by ultimate coating use or shall be agreed uponbetween the purchaser and seller.
For tests in the field, ensure that the surface isclean and dry. Extremes in temperature or relative humiditymay affect the adhesion of the tape or the coating.
Thendry or prepare the surface, or both, as agreed upon between thepurchaser and the seller. When making the incisions, use thestraightedge and cut through the coating to the substrate in onesteady motion. If the substrate has not been reached make anotherX in a different location. Do not attempt to deepen a previouscut as this may affect adhesion along the incision.
Remove an additional length at a steady that is, not jerked rate and cut a piece about 75 mm 3 in. Smooth the tape into place by finger in the area of theincisions and then rub firmly with the eraser on the end of apencil. The color under the transparent tape is a usefulindication of when good contact has been made. For large structures make sufficient tests to ensure that theadhesion evaluation is representative of the whole surface.
Discard cuttingtools that develop nicks or other defects that tear the film. If the adhesionstrength of the tape has not been determined, report the specifictape used and its manufacturer. Precision and Bias Apparatus and Materials It is of particular importance that the cutting edge oredges be in good condition. Test Specimens Itshould be noted, however, that multitip cutters7provide goodresults only on test areas sufficiently plane that all cutting edgescontact the substrate to the same degree.
Check for flatnesswith a straight edge such as that of the tempered steel rule After drying or testing the coating, conduct thetape test at room temperature as defined in SpecificationD, unless D standard temperature is required oragreed.
ASTM D 1. Scope 1. Note 1—This test method has been reported being used to measure adhesion of organic coatings on soft substrates for example, wood and plastic. Issues with plastic substrates are noted in Appendix X1. A similar test method, ISO , permits tests on soft substrates for example, wood and plaster. Precision and bias data on the later is lacking.
A number in parentheses indicates the year of last reapproval. NOTE 1—This test method has been reported being used to measureadhesion of organic coatings on soft substrates for example, wood andplastic. Issues with plastic substrates are noted in Appendix X1. Asimilartest method, ISO , permits tests on soft substrates for example, woodand plaster. Precision and bias data on the later is lacking.