Designation: D – 01Standard Test Method for Evaluating Adhesion by Knife1 This standard is issued under the fixed desig. From ASTM D Standard Test Method for Evaluating Adhesion by Knife. Section 3 | Summary of Test Method. Adhesion is determined by making an “ X”. Buy ASTM D Standard Test Method for Evaluating Adhesion by Knife from SAI Global.
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While tape and knife adhesion tests are generally regarded as more subjective than their tensile pull-off adhesion test counter parts, the tape and knife adhesion tests can be much more revealing of the true adhesion properties of a coating system.
Simply stated, the ASTM standard test procedures have limitations that need to be considered when making judgements or decisions based on the test results.
Test Specimen bility of regulatory limitations prior to use. Tensile adhesion tests exert a force perpendicular to the coating system. The test was developed for assessing the adhesion of coating to steel, but can be used on other hard substrates. Hi, You mention on this article that: Summary of Test Method tions. This is primarily due to the directional forces applied to the coating system during the tests. It is the to ensure straight cuts. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service e-mail ; or through the ASTM website.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
Knife adhesion tests may be used to assess the bond to the substrate when the tape d66677 test results revealed a break somewhere higher up in the coating system.
March 3, at For coatings up to 2.
Adhesion testing conducted on acrylic elastomeric coatings applied to cement axtm stucco cannot be evaluated using the tape adhesion test. April 7, at 6: Make each leg 1 of the angle a minimum of However, the subsequent delamination is a result of shear forces.
When the coating is less than 5-mils thick, a cross-cut lattice pattern is created with either six or eleven cuts in each direction.
That is, coatings generally do not disbond from a substrate or other coating as a result of forces that are exerted perpendicular to the surface. Tensile pull-off adhesion is the subject of an article by Melissa Swogger that is also available on the KTA University site.
When appropriate, the nature and location of the separation is documented. Generally, adhesion ratings of 4 and 5 are considered good, adhesion values of 2 and 3 are considered marginal and adhesion values of 0 and 1 are considered poor. August 7, at 8: This article discusses tape and knife adhesion test methods performed according to standardized ASTM International.
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Standard Test Method for Evaluating Adhesion by Knife
The shear tests are oftentimes more definitive because they better replicate the way in which coatings fail. Irrespective of the application of the test, there are standard test methods procedures for conducting adhesion testing that d66777 be followed to ensure consistency, especially when performing comparative analyses.
The test has also been used successfully on softer substrates e. If the tape adhesion test is required, the chalking should be removed from the area prior to performing the test. Once the incisions are made, a pressure sensitive tape with adhesive properties conforming to the requirements of the standard; Figure 1 is applied over the incisions and pressed in place using a pencil eraser.
The tip of a knife blade is then inserted into the intersect of the two incisions and used to attempt to lift the coating from the substrate or an underlying coating.
ASTM D – 01 Standard Test Method for Evaluating Adhesion by Knife
Its a major concern. A superscript epsilon indicates an editorial change since the last revision or reapproval.
Adhesion is evaluated qualitatively on a 0 to 10 d66777. If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.