Edge Chipping: The tablets periphery chips during the coating process or during friability testing.
http://www.eliz.com/glossary.php

@AMS: schöner Link! Aber passt capping nicht besser?
Capping: A portion of the tablets cup, normally near the apex, does not completely bond and separates from the balance of the tablet.

@b.f.: Ich bin sicher kein Experte, was dieses Gebiet angeht. Wohl ist auch noch surface cracking möglich:

Estimation of Capping Incidence by Indentation Fracture Tests

Static indentation tests were done on these compacts at different depths until surface cracking and chipping were observed.
http://www.aapsj.org/view.asp?art=ps030105

Das müsste Pharma entscheiden...:-)

"Ein häufig auftretendes Tablettierproblem ist das Deckeln von Tabletten. Man versteht darunter die radiale Spaltung der Tablette in zwei oder mehrere Fragmente. "
http://www.sub.uni-hamburg.de/ opus/volltexte/1998/16/html/1.pdf

tend to agree with b.f that this fits "capping" better, but I'm not an expert either.