The crosshatch paint adhesion test kits have a wide selection of cross-cut blades to comply with the appropriate ASTM and ISO coating adhesion test methods.
DIN EN ISO 2409 standard describe that the number of cuts shall be 6. The spacing of the cuts in each direction shall be equal and shall depend on the thickness of the coating and on the type of substrate as follows:
1 mm space for hard substrates (metal) 0 - 60µm
2 mm space for soft substrates (plastic) 0 - 60µm
2 mm space for hard or soft substrates 61 - 120µm
3 mm space for hard or soft substrate 121 - 250µm