ASTM D6677 PDF
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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There are circumstances and situations that do not allow standard procedures and methods to provide an accurate representation of coating adhesion. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
Summary of Test Method tions.
Simply stated, the ASTM standard test procedures have limitations that need to be considered when making judgements or decisions based on the test results. This is primarily due to the directional forces applied to the coating system during the tests.
ASTM D – pdf全文-研究报告-在线文档
A number in parentheses indicates the year of last reapproval. However, satm subsequent delamination is a result of shear forces. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. For coatings up to 2. A description of the adhesion criteria is included in Table 3. Keywords 1 length of at least 6.
Coating Adhesion Testing Using Knife/Tape MethodsKTA University
It is important to evaluate the coated surface and not the back of the r6677, since coating debris from the incisions is often removed by the tape. The adhesion by knife test may provide a more accurate picture of the actual adhesion characteristics.
When appropriate, the nature and location of the separation is documented. Both tests are performed by scribing the coating to the substrate with a sharp knife blade in a specific pattern, applying d66777 pressure sensitive tape and then rapidly pulling the tape from the surface.
Coating Adhesion Testing using Knife/Tape Methods
Its a major concern. The shear tests are oftentimes more definitive because they better replicate the way in which coatings fail. Tensile adhesion tests exert dd6677 force perpendicular to the coating system. 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.
April 7, at 6: Adhesion is evaluated qualitatively on a 0 to 10 scale. The tip of a knife blade is then inserted into the intersect of the astj incisions and used to attempt to lift the coating from the substrate or an underlying coating.
If the tape adhesion test is required, the chalking should be removed from the area prior to performing the test. Recently, have seen hubs in service within one year showing heavy signs of spots, blisters, etc due to coatings applied at low temperatures at the construction stage.
Standard Test Method for Evaluating Adhesion by Knife
March 3, at The standard also contains a pictorial guide to aid in the rating of the cross-cut Method B. Users of this standard are expressly f6677 that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Rate according to Table 1. Further, the results of any knife adhesion tests performed on these coatings must be carefully considered.
That is a correct statement. It is the to ensure straight cuts. A superscript epsilon indicates an editorial change since the last revision or reapproval. It is correct this affirmation? Table 1 provides the evaluation criteria for Method A; Table 2 provides the evaluation criteria for Method B.
In many instances a coating system can have excellent tensile adhesion but poor shear adhesion. 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.
Leave a Reply Cancel reply Your email address will not be published. When the coating is greater than 5-mils thick an X-cut with each leg approximately 1. 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. Adhesion is rated on an even number scale between 0 and 10, with 10 having the best adhesion and 0 the worst.
August 8, at 8: Leave this field empty. Eugen, The following comes from the author: 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. This includes personalizing content and advertising. Generally, adhesion ratings of 8 and 10 are considered good, adhesion values of 4 and 6 are considered marginal, and adhesion values of 2 and 0 are considered poor.