ISO 2409-2020 pdf download.Paints and varnishes – Cross-cut test.
4 Principle
Six parallel cuts are introduced in the coating and another six cuts are introduced perpendicular to the first cuts. Any loose paint particles are removed. The cut area is examined visually and compared to a six-step classification.
5 Apparatus
5.1 General
Use ordinary laboratory apparatus, together with the apparatus specified in 52 to £4.
5.2 Cutting tool
5.2.1 General requirements
It Is particularly important to ensure that the cutting tool is capable of creating the specified V-shape throughout the total coating thickness, and that the cutting edges are in good condition. Suitable tools are described in £2.2 and 5.2.3 and shown in Figures 1 and 2.
A single-blade cutting tool (52,2) as well as the multi-blade cutting tool (52.3) are suitable for all coatings and substrates; it shall be ensured that all cuts mark or scratch the substrate. The depth of indentation into the substrate shall be as low as possible, however.
The tools described in £22 and 5.2.3 are suitable for manual use, which is the more usual method of use, but the tools may also be mounted on a motor-driven apparatus, which gives more uniform cutting. The application of the latter procedure shall be subject to agreement between the interested parties.
The apparatus (manual or motor-driven) and the type of cutting tool used have an influence on the test result. Results obtained with different types of cutting tool cannot be directly compared. For each test series, the same cutting tool shall be used.
5.2.2 Single-blade culling tools
5.2.2.1 Hand-held single-blade cutting tool with a cutting edge as shown in Figure]. a).
5.2.2.2 Single-blade cutting tool used in motor-driven apparatus as shown in Figure3.
5.2.2.3 Cutter with a rigid blade with a V-shaped cutting edge as shown in Figure 1 b).
The specific thickness of the blade is not specified, as long as the blade is rigid and the cut produced is V-shaped through the whole thickness of the coating.
NOTE The cutter blade is designed to be broken in a defined manner so that a sharp blade is available at any time.
5.2.3 Multi-blade culling tools
5.2.3.1 Hand-held multi-blade cutting tool with cutting edges as shown in Figure 2.
5.2.3.2 Multi-blade cutting tool used in motor-driven apparatus as shown in Eigure.3.
The multi-blade cutting tool shall have six cutting edges spaced 1 mm, 2 mm or 3 mm apart. In addition, two guide edges (see Figure 2) are necessary to make handling easier. The guide edges and the cutting edges shall lie in one plane (see Figure 2).ISO 2409 pdf download.