1 Scope
This document specifies a test method for assessing the resistance of paint coatings and varnishes (including wood stains) to separation from substrates when a right-angle lattice pattern is cut into the coating, penetrating through to the substrate. The property determined by this empirical test procedure depends, among other factors, on the adhesion of the coating to either the preceding coat or the substrate. This procedure is not, however, a means of measuring adhesion.
Note 1: Where a measurement of adhesion is required, see the method described in ISO 4624.
Note 2: Although the test is primarily intended for use in the laboratory, the test is also suitable for field testing.
The method described can be used either as a pass/fail test or, where circumstances are appropriate, as a six-step classification test. When applied to a multi-coat system, assessment of the resistance to separation of individual layers of the coating from each other can be made.
The test can be carried out on finished objects and/or on specially prepared test specimens.
Although the method is applicable to paint on hard (e.g. metal) and soft (e.g. wood and plaster) substrates, these different substrates need a different test procedure (see Clause 8).
The method is not suitable for coatings of total thickness greater than 250 µm or for textured coatings.
Note: The method, when applied to coatings designed to give a rough patterned surface, will give results which will show too much variation (see also ISO 16276-2).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1513 Paints and varnishes—Examination and preparation of test samples
ISO 2808 Paints and varnishes—Determination of film thickness
ISO 4618 Paints and varnishes—Terms and definitions
ISO 13076 Paints and varnishes—Lighting and procedure for visual assessments of coatings
ISO 15528 Paints, varnishes and raw materials for paints and Varnishes—Sampling
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
——ISO Online browsing platform: available at https://www.iso.org/obp;
——IEC Electropedia: available at http://www.electropedia.org/.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sampling
7 Test specimen
8 Procedure
9 Evaluation and expression of results
10 Designation of the test result
11 Precision
12 Test report
Annex A (Informative) Examples of suitable procedures for removing loose paint
Bibliography
1 Scope
This document specifies a test method for assessing the resistance of paint coatings and varnishes (including wood stains) to separation from substrates when a right-angle lattice pattern is cut into the coating, penetrating through to the substrate. The property determined by this empirical test procedure depends, among other factors, on the adhesion of the coating to either the preceding coat or the substrate. This procedure is not, however, a means of measuring adhesion.
Note 1: Where a measurement of adhesion is required, see the method described in ISO 4624.
Note 2: Although the test is primarily intended for use in the laboratory, the test is also suitable for field testing.
The method described can be used either as a pass/fail test or, where circumstances are appropriate, as a six-step classification test. When applied to a multi-coat system, assessment of the resistance to separation of individual layers of the coating from each other can be made.
The test can be carried out on finished objects and/or on specially prepared test specimens.
Although the method is applicable to paint on hard (e.g. metal) and soft (e.g. wood and plaster) substrates, these different substrates need a different test procedure (see Clause 8).
The method is not suitable for coatings of total thickness greater than 250 µm or for textured coatings.
Note: The method, when applied to coatings designed to give a rough patterned surface, will give results which will show too much variation (see also ISO 16276-2).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1513 Paints and varnishes—Examination and preparation of test samples
ISO 2808 Paints and varnishes—Determination of film thickness
ISO 4618 Paints and varnishes—Terms and definitions
ISO 13076 Paints and varnishes—Lighting and procedure for visual assessments of coatings
ISO 15528 Paints, varnishes and raw materials for paints and Varnishes—Sampling
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 4618 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
——ISO Online browsing platform: available at https://www.iso.org/obp;
——IEC Electropedia: available at http://www.electropedia.org/.
Contents of GB/T 9286-2021
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Sampling
7 Test specimen
8 Procedure
9 Evaluation and expression of results
10 Designation of the test result
11 Precision
12 Test report
Annex A (Informative) Examples of suitable procedures for removing loose paint
Bibliography
