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To know the quality of paint on the pre-painted sheet therefore, samples are cut and deep drawn according to Erichsen Principle to determine the depth to which they can be drawn before the paint cracks.
Conforms to German Standards DIN 53156 and ISO Recommendation R149.
Pressing the clamped test piece into a die by means of a ball or penetrator with a spherical end until rupture commences; measuring the depth of the cup.