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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There are circumstances and astj that do not allow standard procedures and methods to provide an accurate representation of coating adhesion. March 3, at Tensile pull-off adhesion is the subject of an article by Melissa Swogger that is also available on the KTA University site.
Standard Test Method for Evaluating Adhesion by Knife
The values given in parentheses are for information 5. In addition, the method is not to be used on overly thick coatings that cannot be cut to the substrate with a utility knife blade in one stroke. Users of ast 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. Adhesion testing conducted on acrylic elastomeric coatings applied to cement or stucco cannot be evaluated using the tape adhesion test.
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Apparatus and Materials only. August 22, at Summary of Test Method tions. Adhesion is rated on an even number scale between 0 and 10, with 10 having the best adhesion and 0 the worst. Report Current edition approved May 10, 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.
A number in parentheses indicates the year of last reapproval. 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 and pressed in place using a pencil eraser. 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 Leave a Reply Cancel reply Your email address will not be published. If the tape adhesion test is required, the chalking should be removed from the area prior to performing the test. 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.
However, the subsequent delamination is a result of shear forces. 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 v6677 stage.
When the coating is greater than 5-mils thick an X-cut with each leg approximately 1. Undercutting and peeling can occur as a result of shear forces.
Although this method is a qualitative and a subjective 7. After removal of the tape, the amount of coating removed from the substrate or underlying coating is rated. Tape and knife adhesion exert a prying type of force. In many instances a coating system can have excellent tensile adhesion but poor shear adhesion.
For coatings up to 2. Rate according to Table 1. Your email address will not be published.
Coating Adhesion Testing using Knife/Tape Methods
Adhesion is evaluated qualitatively on a 0 to 10 scale. Both tests are performed by scribing the coating to the substrate d667 a sharp knife blade in a specific pattern, applying a pressure sensitive tape and then rapidly pulling the tape from the surface. That is a correct statement.
The shear tests are oftentimes more definitive because they better replicate the way in astk coatings fail. The adhesion by knife test may provide a more accurate picture of the actual adhesion characteristics. It is correct this affirmation?
The test has also been used successfully on softer substrates e. Keywords 1 length of at least 6. The tip of a knife blade is then inserted into zstm intersect of the two incisions and used to attempt to lift the coating from the substrate or an underlying coating. Never the less, the adhesion is oftentimes considered to be acceptable under these conditions. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.
See DD and D Further, the results of any knife adhesion tests performed on these coatings must be carefully considered. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at adtm above address or at phonefaxor service e-mail dd6677 or through the ASTM website. When the coating is awtm than 5-mils thick, a cross-cut lattice pattern is created with either six or eleven cuts in each direction.
Table 1 provides the evaluation criteria for Method A; Table 2 provides the evaluation criteria for Method B.