Proper handling of ceramic capacitor presented in this app note from CalRamic Technologies LLC. Link here (PDF)
Ceramic capacitors are susceptible to mechanical and thermal shock and larger capacitors in particular can be easily damaged if the operator does not pay particular attention to how they handle the device. In addition, care should be taken to insure that the surface of a capacitor is not contaminated or compromised. Failure to observe basic handling practices may result in the formation of internal micro fractures, surface chip outs and / or other adverse conditions, which may affect the performance and reliability of the component.