ISO 16276-2-2007 “Evaluation and acceptance criteria for adhesion/cohesion (fracture strength) of protective coating systems to corrosion protective coatings on steel structures – Part 2: cross-cut and X-cut tests”
introduction
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ISO 16276-2-2007 “Evaluation and acceptance criteria for adhesion/cohesion (fracture strength) of protective coating systems to corrosion protective coatings on steel structures – Part 2: cross-cut and X-cut tests”
ISO 16276-2 was developed by the European Committee for Standardization (CEN) Technical Committee CEN/TC 139, Paints and varnishes, in cooperation with the Technical Committee ISO/TC 35, Paints and Varnishes, Subcommittee SC 14, Coating Systems for the protection of Steel structures.
ISO 16276 consists of the following parts, with the general title “Corrosion protection of steel structures by protective coating systems – Evaluation and acceptance criteria for coating adhesion/cohesion (breaking strength) :
– Part 1: Pull-out test
– Part 2: Crosscutting test and X-cutting test
introduce
The main purpose of this part of ISO 16276 is to complement the ISO 12944 series in the field evaluation and acceptance criteria for coating adhesion/cohesion.
Note that this part of ISO 16276 is designed to evaluate transverse and X-cut tests for paint coatings on steel structures in the field. ISO 2409 prescribes crosscut testing and ASTM D 3359 prescribes a generic X-cut test without a note explaining the results or accepting or rejecting the criteria.
ISO 16276-2-2007 “Evaluation and acceptance criteria for adhesion/cohesion (fracture strength) of protective coating systems to corrosion protective coatings on steel structures – Part 2: cross-cut and X-cut tests”
Breaking strength testing is often destructive and therefore requires maintenance work, the extent of which depends on the specifications and durability required for the protective paint coating.
The objective of this part of ISO 16276 is to minimize variability and achieve uniformity in practice when evaluating the break strength of bedliner coatings, and to establish acceptance/rejection criteria for such coatings. The method uses test equipment based on the principles of crosscutting and X-cutting.
1 Range
This part of ISO 16276 specifies that when cutting in the form of a rectangular lattice pattern (crosscut) or X (X-cut), the resistance rating program of the coating system is permeated into the coating and onto the substrate.
This part of ISO 16276 applies only to ratings that specify a crosscut or X-cut test method and the corresponding rating level.
Note that the characteristics of the coating can make it difficult to evaluate crosscut or X-cut test results.
ISO 16276-2-2007 “Evaluation and acceptance criteria for adhesion/cohesion (fracture strength) of protective coating systems to corrosion protective coatings on steel structures – Part 2: cross-cut and X-cut tests”
This part of ISO 16276 also specifies suitable equipment and defines inspection areas, sampling plans and acceptance/rejection criteria.
It does not specify a rating for a particular coating system.
2 Normative references
The following reference files are required for the application of this document. For dated references, only the cited version applies. For undated references, a new version of the reference (including any revisions) applies.
ISO 2409-2006, paints and varnishes. Cross cutting test
ISO 12944-7, Paints and varnishes – Corrosion protection of steel structures through protective coating systems – Part 7: Execution and supervision of paint work
ISO 12944-8, Paints and varnishes – Corrosion protection of steel structures by protective coating systems – Part 8: Development of new work and maintenance specifications
ISO 19840, Paints and varnishes – Corrosion protection of steel structures by protective coating systems – Standard for measurement and acceptance of dry film thickness on rough surfaces
ASTM D 3359-02, Standard Test Method for Measuring Adhesion by Tape testing
ISO 16276-2-2007 “Evaluation and acceptance criteria for adhesion/cohesion (fracture strength) of protective coating systems to corrosion protective coatings on steel structures – Part 2: cross-cut and X-cut tests”
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 Breaking strength
More than the force needed for the relay
– Between coatings or between coatings and substrate (adhesion) and/or
– Inside the coat (cohesive)
Note 1: This part of ISO 16276 does not define a method for determining breaking strength (see ISO 16276-1).
3.2 Adhesion
Adhesion at the interface between a solid surface and another material caused by molecular forces
Note 1: Adhesion should not be confused with cohesion.
[Source: ISO 4618:2006]
ISO 16276-2-2007 “Evaluation and acceptance criteria for adhesion/cohesion (fracture strength) of protective coating systems to corrosion protective coatings on steel structures – Part 2: cross-cut and X-cut tests”
3.3 Cohesion
The force that binds the film together into a single entity
Note 1: Cohesion should not be confused with adhesion.
[Source: ISO 4618:2006]
3.4 Coat
A continuous layer of coating material produced from a single application
[Source: ISO 4618:2006]
3.5 Clothes
A continuous layer formed by a single or multiple coating of a coating material onto a substrate
[Source: ISO 4618:2006]
3.6 Checking Areas
The specified area where the sampling plan has been applied can be the entire structure or a selected part of the structure
ISO 16276-2-2007 “Evaluation and acceptance criteria for adhesion/cohesion (fracture strength) of protective coating systems to corrosion protective coatings on steel structures – Part 2: cross-cut and X-cut tests”
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