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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August 8, at 8: August 7, at 8: Compliance concerns here maybe need further investigation before final releases.
Coating Adhesion Testing using Knife/Tape Methods
In many instances a coating system can have excellent tensile adhesion but poor shear adhesion. Adtm test was developed for assessing the adhesion of coating to steel, but can be used on other hard substrates. It is correct this affirmation?
Adhesion testing conducted on acrylic elastomeric coatings applied to cement or stucco cannot be evaluated using the tape adhesion test. When appropriate, the nature and location of the separation is documented.
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Eugen, The following comes from the author: Tensile adhesion tests exert a force perpendicular to the coating system. In order to be successful a coating system has to have both good tensile and shear adhesion.
This article discusses tape and knife adhesion test methods satm according to standardized ASTM International. When the coating is greater than 5-mils thick an X-cut with each leg approximately 1. April 7, at 6: Inspection Instruments Pipeline Coatings — Volume 2: A description ashm the adhesion criteria is included in Table 3.
ASTM D – 01 Standard Test Method for Evaluating Adhesion by Knife
Tensile atsm adhesion is the subject of an article by Melissa Swogger that is also available on the KTA University site. Table 1 provides the evaluation criteria for Method A; Table 2 provides the evaluation criteria for Method B.
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 x6677 can be much more revealing of the true adhesion properties of a coating atsm.
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. For coatings up to 2. Adhesion tests that consistently reveal an adhesive break between coats or a cohesive break within a coat do not provide any information relative to the adhesion of the coating or coating system to the substrate.
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A superscript epsilon indicates an editorial change since the last revision or reapproval. A number in parentheses indicates the year of last reapproval.
Once the incisions are made, a pressure sensitive tape with adhesive properties conforming to the requirements of the standard; Figure 1 is applied dd6677 the incisions and pressed in place using a pencil eraser. After removal of the tape, the amount of coating removed from the substrate or underlying coating is rated. Both tests are performed by scribing the coating to the substrate with a sharp knife blade in a specific pattern, applying a pressure sensitive tape and then rapidly pulling the tape from the surface.
Heavily chalked paints typically show very good tape adhesion properties, since only the friable chalk layer is removed by the tape the weakest planeleaving the coating system intact. The standard also contains a pictorial guide to aid in the rating of the cross-cut Method B.
Leave a Reply Cancel reply Your email address will not be published. It is the to ensure straight cuts. The values given satm parentheses are for information 5. 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. Hi, You mention on this article that: This is primarily due to the directional forces applied to the coating system during the tests.
See DD and D Adhesion is rated on an even number scale between 0 and 10, with 10 having the best adhesion and 0 the worst. March 3, at Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Test Specimen bility of regulatory limitations prior to use. August 22, at Leave this field empty. That is a correct statement.
Standard Test Method for Evaluating Adhesion by Knife
Adhesion is rated based on the scale provided in the ASTM standard. Further, the results of any knife adhesion tests performed on these coatings must be carefully considered. Report Current edition approved May 10, Make each leg 1 of the angle a minimum of Although this method is a qualitative and a subjective 7.
Knife adhesion tests may be used to assess the bond to the substrate when the tape adhesion test results revealed a break somewhere higher up in the coating system. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
A cohesive separation is one that occurs within a coating layer; an adhesive separation is one that occurs between coating layers or between the coating and the substrate.