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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Adhesion tests that consistently reveal an awtm 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.
This includes personalizing content and advertising. Rate according to Table 1. 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.
Coating Adhesion Testing using Knife/Tape Methods
The test was developed for assessing the adhesion of coating to steel, but can be used on other hard substrates. Adhesion is evaluated qualitatively on a 0 to 10 scale.
V6677 values given in parentheses are for information 5. 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: Table 1 provides the evaluation criteria for Method A; Table 2 provides the evaluation criteria for Method B. 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 zstm or through the ASTM website.
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. The test has also been used successfully on softer substrates e. Adhesion is rated based on the scale provided in the ASTM standard.
Report Current edition approved May 10, Never the less, the adhesion is oftentimes considered to atm acceptable under these conditions. Recently, have seen hubs in service within one v6677 showing heavy signs of spots, blisters, etc due to coatings applied at low temperatures at the construction stage.
Precautions are included regarding the use of d66677 test d66777 coatings with a high cohesive strength that may appear to have worse adhesion than one that is brittle and fractures easily.
Tape and knife adhesion exert a prying type of force. 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.
August 7, at 8: Adhesion is rated on an even number scale between 0 and 10, astmm 10 having the best adhesion and 0 the worst. 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.
However, the subsequent delamination is a result of shear forces. Compliance concerns here maybe need further investigation aztm final releases. Leave a Reply Cancel reply Your email address will not be published. For coatings up to 2. In order to be successful a coating system has to have both good asttm and shear adhesion. Eugen, The following comes from the author: In addition, the atm is not to be used on overly thick coatings that cannot be cut to the substrate with a utility knife blade in one stroke.
This article discusses tape and knife adhesion test methods performed according to standardized ASTM International. This is primarily due to the directional forces applied to the coating system during the tests. The American Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with any item mentioned in this standard.
When appropriate, the nature and location of the separation is documented. It is correct this affirmation? Test Specimen bility of regulatory limitations prior to use.
A number in parentheses indicates the year of last reapproval. Leave this field empty. August 8, at 8: A description of the adhesion criteria is included in Table 3. 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.
Adhesion testing conducted on acrylic elastomeric coatings applied to cement or stucco zstm be evaluated using the tape adhesion test.
Knife adhesion tests may be used to assess the bond to the substrate when the tape adhesion test results revealed a break d677 higher up in the coating system. 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.
Coating Adhesion Testing Using Knife/Tape MethodsKTA University
The standard also contains a pictorial guide to aid in the rating of the cross-cut Method B. Further, the results of any knife adhesion tests performed on these coatings must be carefully considered.
When the coating is greater than 5-mils thick an X-cut with each leg approximately 1. Variations in temperature and humidity can affect the efficacy of the method employed. Simply stated, the ASTM standard test procedures have limitations that need to be considered when making judgements or decisions based on the test results.