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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When appropriate, the nature and location of the separation is documented.
Coating Adhesion Testing using Knife/Tape Methods
ASTM D – pdf全文-研究报告-在线文档
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. Adhesion testing conducted c6677 acrylic elastomeric coatings applied to cement or stucco cannot be evaluated using the tape adhesion test. Undercutting and peeling can occur as a result of shear forces. A superscript epsilon indicates an editorial change since the last revision or reapproval.
Standard Test Method for Evaluating Adhesion by Knife
Users of this standard are expressly advised that determination of the validity of d66677 such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. The test has also been used successfully on softer substrates e.
In order to be successful a coating system has to have both good tensile and shear adhesion. In many instances a coating system can have excellent tensile adhesion but poor shear adhesion.
Tensile adhesion tests exert a force perpendicular to the coating system. 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.
Individual reprints single or multiple copies of zstm standard may be obtained by contacting ASTM at the above address or at phonefaxor service e-mail ; or through the ASTM website. Rate according to Table 1. The tip of a knife blade is then inserted into the intersect of the two incisions and used to attempt to lift the coating from the substrate or an underlying coating.
Inspection Instruments Pipeline Coatings — Volume 2: A number in parentheses indicates the year of last reapproval. 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.
This article discusses tape and knife adhesion test methods performed according to standardized ASTM International. Report Current edition approved May 10, August 8, at 8: There are circumstances and situations that do not allow standard procedures and methods to provide an accurate representation of coating 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.
ASTM D – 01 Standard Test Method for Evaluating Adhesion by Knife
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.
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. The values given in parentheses are for information 5. If the tape adhesion test is required, the chalking should be removed from the area prior to performing the test. This asstm primarily due to the directional forces applied to the coating system during the tests.
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.
See DD and D However, the subsequent delamination is a result of shear forces. Once the incisions are made, a pressure sensitive tape with adhesive properties conforming to the requirements of the standard; Figure 1 is applied over the incisions awtm pressed in place using a pencil eraser.
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. Apparatus and Materials only. A description of the adhesion criteria is included in Table 3.
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.
Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. Keywords 1 length of at least 6.