A film coating is a thin polymer-based coat applied to a solid dosage form such as a tablet. The thickness of such a coating is usually between 20-100 µm. It is possible to follow the dynamic curing effect on tablet coating structure by using non-destructive analytical methodologies.
Film coating formulations usually contain the following components:
- Polymer
- Plasticizer
- Colourant
- Opacifier
- Solvent
- Vehicle
Functionality wise it is further divided into:
- Immediate release coating
- Sustained release or modified release coating
- Enteric release coating
References
Film coating Wikipedia(Text) CC BY-SA