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→13.2.1.4 Ductility
If the ductility is too low, cracks can develop in the layer. This crack formation can occur due to internal stresses right after the deposition or develop from mechanical stressing during subsequent mechanical deformation.
To evaluate the ductility of gold layers, a bending test according to DIN 50 153 is usually employed. For certain applications the testing method is agreed upon between the coating manufacturer and the user. After bending the test sample over a pre-defined radius the surface layer in the bend area is examined microscopically. The detection of cracks or even delaminating is an indication of insufficient ductility.
===13.2.2 Functional Properties===
