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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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 astj stage. That is a correct statement. Leave this field empty.

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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.

Hi, You mention on this article that: This is primarily due to the directional forces applied to the coating system during the tests. Never the less, the adhesion is oftentimes considered to be acceptable under these conditions.

Coating Adhesion Testing using Knife/Tape Methods

When the coating is greater than 5-mils thick an X-cut with each leg approximately 1. This article discusses tape and knife adhesion test methods performed according to standardized ASTM International. A cohesive separation is one that occurs within a coating wstm an adhesive separation is one that occurs between coating layers or between the coating and the substrate.

Variations in temperature and humidity can affect the efficacy of the method employed.

ASTM D – 01 Standard Test Method for Evaluating Adhesion by Knife

Test Specimen bility of regulatory limitations prior to use. The shear tests are oftentimes more definitive because they better replicate the way in which coatings fail. Adhesion is rated on an even number scale between 0 and 10, with 10 having the best adhesion and 0 the worst. Tensile pull-off adhesion is the subject of an article by Melissa Swogger that is also available on the KTA University site. 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.

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Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. In order to be successful a coating system has to have both good tensile and shear adhesion. Tensile adhesion tests exert a force perpendicular to the coating system.

Simply stated, the ASTM standard test procedures have limitations that need to be considered when making judgements or decisions based on the test results. The standard also contains a pictorial guide to aid in the rating of the cross-cut Method B. Rate according to Table 1.

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. It is correct this affirmation? Leave a Reply Cancel reply Your email address will not be published. August 8, at 8: Report Current edition approved May 10, Its a major concern. 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.

Standard Test Method for Evaluating Adhesion by Knife

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. 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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Further, the results of any knife adhesion tests performed on these coatings must be carefully considered. Adhesion is rated based on the scale provided in the ASTM standard. The values given in parentheses are for information 5.

R6677 7, at 6: While tape and knife adhesion tests are generally regarded as more subjective than their tensile pull-off d66777 test counter parts, the tape and knife adhesion tests can be much more revealing of the true adhesion properties of a coating system. The adhesion by knife test may provide a more accurate picture of the actual adhesion characteristics. August 7, at 8: Summary of Test Method tions.

After removal of the tape, the amount of coating removed from the substrate or underlying coating is rated. A superscript epsilon indicates an editorial change since the last revision or reapproval.

August 22, at See DD and D 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. Eugen, The following comes from the author: Apparatus and Materials only.

Undercutting and peeling can occur as a result of shear forces.

The test has also been used successfully on softer substrates e. This includes personalizing content and advertising.