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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Compliance concerns here maybe need further investigation before final releases. A description of the adhesion criteria is included in Table 3.
Leave a Reply Cancel reply Your email address will not be published. Tensile adhesion tests exert a force perpendicular to the coating system. Table 1 provides the evaluation criteria for Method A; Table 2 provides the evaluation criteria for Method B.
Standard Test Method for Evaluating Adhesion by Knife
There are circumstances and situations that do not allow standard procedures and methods to provide an accurate representation of coating adhesion. It is correct this affirmation?
The adhesion by knife test may provide a more accurate picture of the actual adhesion characteristics. 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.
Apparatus and Materials only. The standard also contains a pictorial guide to aid in the rating of the cross-cut Method B.
This article discusses tape and knife adhesion test methods performed according to standardized ASTM International. Hi, You mention on this article that: This test method has been vertex of the angle, attempt to lift up the coating from the found useful as a simple means of assessing the adhesion of substrate or from the coating below.
ASTM D – 01 Standard Test Method for Evaluating Adhesion by Knife
If the tape adhesion test is required, the chalking should be removed from the area prior to performing the test. 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 axtm shown below. 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.
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 values given in parentheses are for information 5. 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.
When the coating is less than d66777 thick, a cross-cut lattice pattern is created with either six or eleven cuts in each direction. A number in parentheses indicates the year of last reapproval.
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.
Keywords 1 length of at least 6. 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.
That is a correct statement. 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.
It is important to evaluate the coated surface and not the back of the tape, since coating debris sstm the incisions d6677 often removed by the tape. Test Specimen bility of regulatory limitations prior to use. Adhesion is rated based on the scale provided in the ASTM standard. Tape and knife adhesion exert a prying type of force.
The shear tests are oftentimes more definitive because they better replicate the way in which coatings fail. After removal of the tape, the amount of coating removed from the substrate or underlying coating is rated.
The test was developed for assessing the adhesion of coating to steel, but can be used on other hard substrates.
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.
Your email address will not be published. Further, the results of any knife adhesion tests performed on these coatings must be carefully considered. In order to be successful a coating system has to have both good tensile f6677 shear adhesion. A superscript epsilon indicates an editorial change since the last revision or reapproval.
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. Adhesion is rated on an even number scale between 0 and 10, with 10 having the best asttm and 0 the worst. This includes personalizing content and advertising.
ASTM D – 18 Standard Test Method for Evaluating Adhesion by Knife
Simply stated, the ASTM standard test procedures have limitations that need to be considered when making judgements or decisions based on the test results. August 7, at 8: In many instances a coating system can have excellent tensile adhesion but poor shear adhesion.