Meaning and Purpose
1 For a paint to function satisfactorily, it needs to adhere to the substrate on which it is applied. It has been found that this test method can be used as a simple method to evaluate the adhesion of coatings. Although this method is a qualitative (subjective) test, it has been used in industry for many years and can provide valuable information.

2 Other adhesion testing methods may be useful to obtain quantitative results. See test methods D2197, D3359, D4541 and D7234.

3 The performance evaluation scale (see Table 1) is based on the difficulty of removing the coating from the substrate and the size of the coating fragments removed.

4 There is no known correlation between this test method and other adhesion test methods (stripping, tape, etc.).

5 Coatings with high cohesive strength appear to be less cohesive than brittle coatings and thus are prone to rupture upon probing.

6 This method is not suitable for coating that is too thick, that is, coating that cannot be cut to the substrate in one stroke with a utility knife.

ASTM D6677-2018 Evaluation of Adhesion by Blade Method

Scope of
1 The test method covers the procedure of evaluating the adhesion of the coating to the substrate using a knife.

2 This test method is used to determine whether the adhesion of the coating to the substrate or another coating (in a multi-layer coating system) is generally sufficient.

Note 1: The term “substrate” refers to the basic surface (which may be steel, concrete, etc., or other coatings) to which the coating adheres.

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

4 Values expressed in SI units should be considered standard. The values given in parentheses are for reference only.

ASTM D6677-2018 Evaluation of Adhesion by Blade Method

Record of documents
ASTM D6677

June 1, 2018

Standard test method for evaluating knife edge adhesion

The test method covers the process of evaluating the adhesion of the coating to the substrate using a knife. This test method is used to determine whether the coating adheres to the paint.

ASTM D6677

Dated July 1, 2007

Standard test method for evaluating knife edge adhesion

The test method covers the process of evaluating the adhesion of the coating to the substrate using a knife. This test method is used to determine whether the coating adheres to the paint.

ASTM D6677

Dated July 1, 2007

ASTM D6677-2018 Evaluation of Adhesion by Blade Method

Standard test method for evaluating knife edge adhesion

The test method covers the process of evaluating the adhesion of the coating to the substrate using a knife. This test method is used to determine whether the coating adheres to the paint.

ASTM D6677

May 10, 2001

Standard test method for evaluating knife edge adhesion

1. Scope 1.1 This test method covers the procedure for evaluating the adhesion of the coating to the substrate using a knife. 1.2 This test method is used to determine the existence of adhesion.