The composition of a coating solution is explained in Table 5.3.
Table 5.3 Composition of Film Coating Solution
| Composition of Coating Solution | Enteric Coating | Non-enteric Coating |
|---|---|---|
| Polymer | Cellulose acetate phthalate, shellac, eudragits, hydroxypropyl methyl cellulose acetate | Ethyl cellulose, methyl cellulose, HPMC, and PVP |
| Solvent | Ethanol, acetone, rectified spirit, and isopropyl alcohol | |
| Plasticizers | PEG 200, PEG 400, and diethyl phthalate | |
| Coloring agents | FD&C approved colors | |
| Opacifying agents | Titanium dioxide, aluminum hydroxide, and purified talc | |
| Flavoring agents | Optional | |
| Surfactants | Optional | |
| Polishing agents | Beeswax/Carnauba wax, acetone, and alcohol | |
- Reduction in coating time and material cost.
- No significant increase in tablet weight.
- No seal coating is required.
- Number of coating steps is less.
- It is resistant to chipping and cracking.
Disadvantages
- It has risk of flammability hazards.
- It is concern over environmental pollution.
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