Edging
Edging is a tablet defect in which sharp edges appear on the final compressed tablet. This type of tablet defect also known as collaring of tablet.
Causes
- High moisture content in granules
- Waxy or elastic nature of API or excipients in formulation
- Higher compression pressure
- Poor punch design or improper selection of punch
Remedies
- Proper milling and drying
- Compression pressure adjustment
- Proper design of punch
Chipping
Chipping is a tablet defect in which breaking of tablet edges during compression process or subsequent handling and coating.
Causes
- Insufficient binder
- Too dry granules
- Improper punch setting
- Rough surface of punches and dies
Remedies
- Sufficient binder
- Moisten the granules
- Proper punch setting
- Right choice of tooling (punches and dies)
