The adherence strength of enamel to steel is tested by dropping a steel ball on the coated surface.
The adherence is evaluated based on the relics of enamel on the destroyed surface.
According to EN 10209, the enamel adherence strength can be classified into 1st, 2nd, 3rd, 4th and 5th grade.
If the most of the enamel layer is removed from the steel sheet, and the surface appears silvery bright after the impact, the adherence strength is poor and classified as 5th grade.
If the most of enamel layer remains on the steel sheet, the adherence strength is excellent and classified as 1st grade.
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