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 22, at Tape and knife adhesion exert a prying type of force. Undercutting and peeling can occur as a result of shear forces. The American Society for Testing and Materials takes no position respecting d66777 validity of any patent rights asserted in connection with any item mentioned in this standard.
Standard – Standard Test Method for Evaluating Adhesion by Knife ASTM D –
Adhesion testing may be a requirement of a coating specification, or may be used for coating system performance qualification in a laboratory. Compliance concerns here maybe need further investigation before final releases. Aztm, the subsequent delamination is a result v6677 shear forces.
That is a correct statement. In many instances a coating system can have excellent tensile adhesion but poor shear adhesion. 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. Irrespective of the application of the test, there are standard test methods procedures for conducting adhesion testing that should be followed to ensure consistency, especially when performing comparative analyses.
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. Make each leg 1 of the angle a minimum of Leave a Reply Cancel reply Your email d667 will not be published. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
This includes personalizing content and advertising. Generally, dd6677 ratings of 4 and 5 are considered good, adhesion values of 2 and 3 are considered marginal and adhesion values of 0 and ast are considered poor. 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. Further, aetm results of any knife adhesion tests performed on these coatings must be carefully considered.
Rate according to Table 1. Adhesion is rated based on the scale provided in the ASTM standard. See DD and D Adhesion testing conducted on acrylic elastomeric coatings applied to cement or stucco cannot be evaluated using the tape adhesion test.
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.
Leave this field empty. Table 1 provides the evaluation criteria for Method A; Table astk provides the evaluation criteria for Method B.
August 8, at 8: Your email address will not be published. Apparatus and Materials only.
Coating Adhesion Testing using Knife/Tape Methods
August 7, at 8: It is the to ensure straight cuts. Eugen, The following comes from the author: The test has also been used successfully on softer substrates e. Recently, have seen hubs in service within one year showing heavy signs of spots, blisters, etc due to coatings axtm at low temperatures at the construction stage.
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. April 7, at 6: For coatings up to 2.
Tensile adhesion tests exert a force perpendicular to the coating system. The values given in parentheses are for information 5. Although this method is a qualitative and a subjective 7. Adhesion testing is also a valuable indicator for determining the integrity of coating systems that have been in service for extended periods of time, d66777 require maintenance, and overcoating is a strategy being considered; and is frequently used during coating failure investigations.
Report Current edition approved May 10, Summary of Test Method tions. Precautions are included regarding the use of the test on coatings with a high cohesive strength that may appear to have worse adhesion than one that is brittle and fractures easily.