What is this standard about?
It details a way of testing how paint coatings resist separation when they’re cut.
Who is this standard for?
- Paint manufacturers
- Anyone conducting laboratory or field testing of paints and varnishes
Why should you use this standard?
It describes a test method for assessing the resistance of paint coatings to separation from substrates when a right-angle lattice pattern is cut into the coating, penetrating through to the substrate.
The method described may 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 may be made.
Although the test is primarily intended for use in the laboratory, it is also suitable for field testing. 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.
NOTE: The method is not suitable for coatings of total thickness greater than 250 gm or for textured coatings. The method, when applied to coatings designed to give a rough patterned surface, will give results which will show too much variation.
What’s changed since the last update?
This standard is a revision of BS EN ISO 2409:2007. The main changes are:
- The description of suitable methods for removal of loose paint have been transferred to an informative annex as examples and, for the method using adhesive tape, the adhesive strength of the tape is no longer specified
- The single-blade cutting tool originally used in the first edition (1972) of this international standard has been re-introduced
- A cutting tool used with automatic cross-cut apparatus has also been specified
- The pictorial standard for classification 2 has been replaced by one originally used in the first edition (1972) and the second edition (1992) of this international standard
- Plastics have been added as an example of a hard substrate in 6.1.4
- A designation code has been introduced to indicate the test result
- The supplementary test conditions previously in Clause 7 have been integrated in the test report
- A note has been added to Subclause 3.2.1 that the apparatus (manual or motor-driven) and the type of cutting tool used have an influence on the test result
