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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This article discusses tape and knife adhesion test methods performed according to standardized ASTM International. Compliance concerns here maybe need further investigation before final releases. The adhesion by knife test may provide a more accurate picture of the actual adhesion characteristics.
ASTM D – 01 Standard Test Method for Evaluating Adhesion by Knife
Simply stated, the ASTM standard test asmt have limitations that need to be considered when making judgements or decisions based on the test results. Adhesion is rated based on the scale provided in the ASTM standard.
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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.
Variations in temperature and humidity can affect the efficacy of the method employed. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Never the less, the adhesion is oftentimes considered to be acceptable under these conditions.
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 values given in parentheses are for information 5.
Coating Adhesion Testing using Knife/Tape Methods
The standard also contains a pictorial guide to aid in the rating of the cross-cut Method B. Adhesion testing conducted on acrylic elastomeric coatings applied to cement or stucco cannot be evaluated using the tape adhesion test. Its a major concern. Adhesion testing may be a requirement of a coating specification, or may be used for coating system performance qualification in a laboratory.
However, the subsequent delamination is a result of shear forces. April 7, at 6: 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.
August 22, at August 7, at 8: It is important to evaluate the coated surface and not the back of the tape, since coating debris from the incisions is often removed by the tape. It is the to ensure straight cuts.
The Asfm Society for Testing and Materials takes no position respecting the validity of any patent rights asserted in connection with d677 item mentioned in this standard. A description of the adhesion criteria is included in Table 3.
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.
Tensile adhesion tests exert a force perpendicular to the coating system. Further, the results of any knife adhesion tests performed on these coatings must be carefully considered.
Summary of Test Method tions. A number in parentheses indicates the year of last reapproval. Leave this field empty. See DD and D Keywords 1 length of at least 6. 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.
Inspection Instruments Pipeline Coatings — Volume 2: Rate according to Table 1. 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.
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.
Heavily chalked paints typically show very good tape adhesion properties, since only the friable chalk layer is removed by the tape astj weakest planeleaving the coating system intact. Although this method is a qualitative and a subjective 7.
Adhesion testing is also a valuable indicator d6767 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. 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 – pdf全文-研究报告-在线文档
August 8, at 8: Tape and knife adhesion exert a prying type of force. Report Current edition approved May 10, 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.