These robust and user-friendly instruments are used for assessing the cupping capability of coatings applied onto metal sheets up to 1.2mm (0.05”) thick. The 1620 has a 27mm (1.06”) diameter hardened steel die in a clamping device and a 20mm (0.79”) diameter punch. A hand-rotated crank and reduction drive moves the punch progressively into the sample. This method gives good repeatability. A motorized version is also available which replaces the manual crank handle. This ensures perfect reproducibility with constant cupping speed of 200μm per second (7.9mils per second).

The 1620 is available with either an analogue or a digital gage and both models are supplied with an illuminated magnifier to accurately view the deformation’s results. A CCD Video system can also be supplied as an accessory.

The 1620 provides accurate (10μm / 0.4mils) readings of the cupping depth on an integrated gage and direct viewing of the fissures, cracks and tears in the coating.

A coated sheet metal is subjected to a gradual deformation by a polished die. This deformation is caused by the die being pushed from beneath the coating - i.e. from the reverse side of the sheet metal. The end-point is when the coating begins to crack.