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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Adhesion testing is also a valuable indicator for determining the integrity of coating systems that have been in service for extended periods of time, may require maintenance, and overcoating is a strategy being considered; and is frequently used during coating failure investigations. Your email address will not be published. This is primarily due to the directional forces applied to the coating system during the tests. 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.

Test Specimen bility of regulatory limitations prior to use. See DD and D When appropriate, the nature and location of the separation is documented. The standard also contains a pictorial guide to aid in the rating of the cross-cut Method B. This includes personalizing content and advertising. Adhesion testing conducted on acrylic elastomeric coatings applied to cement or stucco cannot be evaluated using the tape adhesion test.

Eugen, The following comes from the author: That is a correct statement. The test was developed for assessing the adhesion of coating to steel, but can be used on other hard substrates. Adhesion testing may be a requirement of a coating specification, or may be used for coating system performance qualification in a laboratory.

Apparatus and Materials only.

Keywords 1 length of at least 6. 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.

A superscript epsilon indicates an editorial change since the last revision or reapproval. This test method has been vertex of the angle, attempt to lift up the coating from the found useful as a simple means axtm assessing the adhesion of substrate or from the coating below.

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Standard Test Method for Evaluating Adhesion by Knife

Generally, adhesion dd6677 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. Both tests are performed by scribing the coating to the substrate with a sharp knife blade in a specific pattern, applying a pressure sensitive tape and then rapidly pulling the tape from the surface. Summary of Xstm Method tions. Variations in temperature and humidity can affect the efficacy of the method employed.

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

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.

However, the subsequent delamination is a result of shear forces. When the coating is greater than 5-mils thick an X-cut with each leg approximately 1.

Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Tape and knife adhesion exert a prying type of force.

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. 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.

A number in parentheses indicates the year of last reapproval. 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.

The shear tests are oftentimes xstm definitive because they better replicate the way in which coatings fail. When the coating is less than 5-mils thick, a cross-cut lattice pattern is created with either six or eleven cuts in each direction.

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It is the to ensure straight cuts. A description of the adhesion criteria is included in Table 3. 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.

Rate according to Table 1. The values given in parentheses are for information 5. The adhesion by knife test may provide a more accurate picture of the actual adhesion characteristics.

Coating Adhesion Testing using Knife/Tape Methods

If the tape adhesion test is required, the chalking should be removed from the area prior to performing the test. After removal of the tape, the amount of coating removed from the substrate or underlying coating is rated. August 7, at 8: 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.

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. Adhesion is rated on an even number scale between 0 and 10, with 10 having the best adhesion and 0 the worst.

It is correct this affirmation? Simply stated, the ASTM standard aastm procedures have limitations that need to be considered when making judgements or decisions based on the test results. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Report Current edition approved May 10, Adhesion is evaluated qualitatively on a 0 to 10 scale. Leave a Reply Cancel reply Your email address will not be published. In order to be successful a coating system has to have both good tensile and shear adhesion.

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