ASTM-D6677 2012

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D6677-07(2012) Standard Test Method for Evaluating Adhesion by Knife

Published By	Publication Date	Number of Pages
ASTM	2012	2

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Categories: 25.220.01 - Surface treatment and coating in general, ASTM

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Description

1.1 This test method covers the procedure for assessing the adhesion of coating films to substrate by using a knife.

1.2 This test method is used to establish whether the adhesion of a coating to a substrate or to another coating (in multi-coat systems) is at a generally adequate level.

Note 1 The term substrate relates to the basic surface on which a coating adheres (may be steel, concrete, etc. or other coating).

1.3 This method can be used in the laboratory and field.

1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Additional information

2	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.).
4	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.
6	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.
Rating	Description
8	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.
10	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.
ICS Codes	25.220.01 - Surface treatment and coating in general

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ASTM-D6677 2012

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