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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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. If you feel v6677 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. August 22, at Individual reprints single or multiple copies of this d6677 may be obtained by contacting ASTM at the above address or at phonefaxor service e-mail ; or through the ASTM website.
Standard – Standard Test Method for Evaluating Adhesion by Knife ASTM D –
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. A number in parentheses indicates the year of last reapproval.
In many f6677 a coating system can have excellent tensile adhesion but poor shear adhesion. August 7, at 8: Tensile adhesion tests exert a force perpendicular to the coating system. Adhesion testing conducted on acrylic elastomeric coatings applied to cement or stucco cannot be evaluated using the tape adhesion test.
Rate according to Table 1. Hi, You mention on this article that: The values given in parentheses are for information 5. Adhesion is rated based on the scale provided in the ASTM standard.
Leave this field empty. Test Specimen bility of regulatory limitations prior to use. When the coating is greater 6d677 5-mils thick an X-cut with each leg approximately 1. A description of the adhesion criteria is included in Table 3. This is primarily due to the directional forces applied to the coating system during the tests.
Coating Adhesion Testing using Knife/Tape Methods
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. There are circumstances and situations that do not allow standard procedures and methods to provide an accurate representation of coating adhesion.
For coatings up to 2. 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.
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. This article discusses tape and knife adhesion test methods performed according to standardized ASTM International. It is correct this affirmation? Variations in temperature and humidity can affect the efficacy of the method employed. Compliance concerns here maybe need further investigation before final releases.
ASTM D – 18 Standard Test Method for Evaluating Adhesion by Knife
However, the subsequent delamination is a result of shear forces. That is a correct statement.
Further, the results of any knife adhesion tests performed on these coatings must be carefully considered. 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.
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. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.
Adhesion is rated on an even number scale between 0 and 10, d677 10 having the best adhesion and 0 the worst. Adhesion is evaluated satm on a 0 to 10 scale. August 8, at 8: