ALTANA Byko-Cut Universal Short Instructions - Manual (Page 3)

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How to perform the Cross-Cut Test How to analyze the Cross-Cut Test
• Select the appropriate cross-cut tool based on the coating
film thickness ( see table )
• Make a lattice pattern in the film with appropriate tool,
cutting to the substrate
• Brush in diagonal direction 5 times each, using a brush
pen or tape and remove with tape
• Examine the grid area using an illuminated magnifier
ISO Class: 0 / ASTM Class: 5B
• Edges of cut are completely smooth
• None of the squares of the lattice is
detached
ISO Class: 1 / ASTM Class: 4B
• Detachment of small flakes at the
intersection of the cuts
• Max. 5 % of the cross cut area is
affected
ISO Class: 2 / ASTM Class: 3B
• Flaked along the edges and /or
intersection of the cuts
• Affected cross-cut area: 5% - 15%
ISO Class: 3 / ASTM Class: 2B
• Squares are partly / wholly damaged
• Affected cross-cut area: 15% - 35 %
ISO Class: 4 / ASTM Class: 1B
• Squares partly / wholly detached
• Affected cross-cut area: 35% - 65 %
ISO Class: 5 / ASTM Class: 0B
• Any flaking worse than ISO 4 or ASTM 1B
• Affected cross-cut area > 65%
Film Thickness Cutter Spacing
0 – 60 µm 1 mm
60 – 120 µm 2 mm
> 120 µm 3 mm