Cupping Tester measurement of coating bond strength

Cupping test Place the sample on the blank holder ring of a special cupping test machine, use a steel ball to squeeze the coated sample from the back of the layer, and evaluate its bonding status according to the coating on the protrusion. If a few parts of the coating fall off, it can be judged that it cannot be combined. If there are cracks at the protrusions but no detachment, it can be considered qualified. If the protrusions are irregular and no detachment, it is generally considered to be well bonded.

The thickness of the spray coating is generally greater than 0.1mm, and the thickness of the brush coating is generally 0.05~0.1mm.

In the actual experiment, it is irreversible to rotate in the process of crimping, otherwise the counting will be inaccurate. When measuring the minimum depth of damage, when the coating surface cracks for the first time or is separated from the substrate, stop rotating the handwheel , to read the crimping depth, the experiment should be repeated to know the result is consistent with the result of the verifier,