BSI PD CEN ISO/TR 19402:2020
$215.11
Paints and varnishes. Adhesion of coatings
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 88 |
This document summarises the common methods for evaluating the adhesive strength of coatings on a substrate, which can be another coating beneath or the substrate itself. The test methods and evaluation methods are described in Clauses 4, 5, and 6. In the case of standardized test methods the respective standard is referenced in regard to procedure and evaluation. Annex A compares the methods in the synoptic Tables A.1, A.2, and A.3.
Often the adhesive strength cannot be sufficiently evaluated by means of a single method.
The purely physical methods for measuring the adhesive strength are such in which mechanical quantities (e.g. force or torsion moment) are measured directly.
All other methods are based on the evaluation of behaviour under mechanic stress according to practical conditions. For these methods the viscoelastic properties have a wide influence on the evaluation of the adhesive strength, so that it can only be tested comparatively within one method.
Each method has its specific application. An unsuitable method can lead to false information. All of the test methods for the evaluation of the adhesive strength require a certain routine of the test person, especially in regard to identifying the separation line. For most of the test methods the test results, among other things, depend on the film thickness of the coating to be tested. In addition, for several methods differences between tests on a test sheet and in practice can occur, due to different roughness of the substrate.
Effects of delamination caused by weathering or corrosion influences are not subject of this document.
In case cohesion failures predominantly occur during an adhesive strength test, this is no measure for the adhesive strength. However, information can be given on the protective effect of the coating against corrosion.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | undefined |
| 4 | European foreword Endorsement notice |
| 7 | Foreword |
| 8 | Introduction |
| 9 | 1 Scope 2 Normative references 3 Terms and definitions |
| 11 | 4 Adhesive strength tests without scratch/cut 4.1 Tests with mechanical stress application on the coating 4.1.1 Pull-off test |
| 13 | 4.1.2 Twist-off test |
| 14 | 4.1.3 Peel-off test 1 |
| 16 | 4.1.4 Peel-off test 2 |
| 17 | 4.2 Tests with continuous deformation of test specimens 4.2.1 Bend test with a wedge-shaped conical mandrel |
| 19 | 4.2.2 Bend test with a conical mandrel |
| 20 | 4.2.3 Bend test with a cylindrical mandrel 1 |
| 22 | 4.2.4 Bend test with a cylindrical mandrel 2 |
| 23 | 4.2.5 Three point bending method |
| 25 | 4.2.6 T-bend test 1 |
| 27 | 4.2.7 T-bend test 2 |
| 28 | 4.2.8 Cupping test 1 |
| 30 | 4.3 Test with impact stress application 4.3.1 Single-impact test 1 |
| 33 | 4.3.2 Single-impact test 2 |
| 35 | 4.3.3 Single-impact test 3 |
| 36 | 4.3.4 Single-impact test 4 |
| 38 | 4.3.5 Falling-weight test 1 |
| 41 | 4.3.6 Falling-weight test 2 |
| 43 | 4.3.7 Falling-weight test 3 |
| 44 | 4.3.8 Multi-impact test 1 |
| 46 | 4.3.9 Multi-impact test 2 |
| 49 | 4.3.10 Multi-impact test 3 |
| 51 | 4.3.11 Multi-impact test 4 |
| 52 | 4.3.12 Impact-bend test |
| 53 | 5 Adhesive strength tests with scratch/cut 5.1 Tests with single scratch 5.1.1 Scratch test 1 |
| 54 | 5.1.2 Scratch test 2 |
| 55 | 5.1.3 Scratch test 3 (Scrape-adhesion test) |
| 57 | 5.2 Test with multiple scratch (without deformation of test specimens) 5.2.1 Pressure-water jetting test |
| 61 | 5.2.2 Cross-cut test 1 |
| 64 | 5.2.3 Cross-cut test 2 |
| 65 | 5.2.4 Cross-cut test 3 |
| 66 | 5.2.5 X-cut test 1 5.2.6 X-cut test 2 |
| 67 | 5.2.7 X-cut test 3 5.2.8 X-cut test 4 |
| 68 | 5.2.9 Scribe test with a square-diagonal grid |
| 69 | 5.2.10 Scribe test with a rhombus grid |
| 70 | 5.3 Test with multiple scratch (with deformation of test specimens) 5.3.1 Cupping test 2 |
| 71 | 6 Evaluation methods for adhesive strength 6.1 Auxiliary methods 6.1.1 Contrasting 1 |
| 72 | 6.1.2 Contrasting 2 6.2 Visual methods 6.2.1 Failure pattern analysis |
| 73 | 6.2.2 Comparison of areas |
| 74 | 6.2.3 General assessment |
| 75 | 6.3 Instrumental methods 6.3.1 Digital image evaluation 1 6.3.2 Digital image evaluation 2 |
| 77 | Annex A Synoptical tables for the methods |
| 84 | Bibliography |
