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Significance and Use
4.1 Coatings, to perform satisfactorily, must adhere to the substrates on which they are applied. This test method has been found useful as a simple means of assessing the adhesion of coatings. Although this method is a qualitative and a subjective test it has been used in industry for many years and can provide valuable information.
Coating is extremely difficult to remove; fragments no larger than approximately 0.8 by 0.8 mm (1/32 in. by 1/32 in.) removed with great difficulty.
Coating is difficult to remove; chips ranging from approximately 1.6 by 1.6 mm (1/16 by 1/16 in.) to 3.2 by 3.2 mm (1/8 by 1/8 in.) can be removed with difficulty.
Coating is somewhat difficult to remove; chips ranging from approximately 3.2 by 3.2 mm (1/8 by 1/8 in.) to 6.3 by 6.3 mm (1/4 by 1/4 in.) can be removed with slight difficulty.
Coating is somewhat difficult to remove; chips in excess of 6.3 by 6.3 mm (1/4 by 1/4 in.) can be removed by exerting light pressure with the knife blade.
Coating is easily removed; once started with the knife blade, the coating can be grasped with ones fingers and easily peeled to a length of at least 6.3 mm (1/4 in.).
Coating can be easily peeled from the substrate to a length greater than 6.3 mm (1/4 in.).
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D2197 Test Method for Adhesion of Organic Coatings by Scrape Adhesion
D3359 Test Methods for Measuring Adhesion by Tape Test
D4541 Test Method for Pull-Off Strength of Coatings Using Portable Adhesion Testers
D7234 Test Method for Pull-Off Adhesion Strength of Coatings on Concrete Using Portable Pull-Off Adhesion Testers
ICS Number Code 19.040 (Environmental testing); 25.220.01 (Surface treatment and coating in general)
UNSPSC Code 41113046(Adhesion tester)
ASTM D6677-07(2012), Standard Test Method for Evaluating Adhesion by Knife, ASTM International, West Conshohocken, PA, 2012, www.astm.orgBack to Top