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The polymer is the film former and the main component on the formulation. The ideal polymer is one capable of producing smooth, thin films that are reproducible under routine coating conditions. The range of materials that can be used as film formers is very wide and covers materials that may be natural, synthetic or semi-synthetic.

The film-coating formulation combines four key ingredients: A film-forming polymer, which provides the mechanical strength of the film. The most widely used polymers in non-functional film coating are cellulose derivatives such as hypromellose. Plasticizers, used to improve the flexibility of the film formed and prevent it from cracking or

Types of Plasticizers According to solubility: The glycerin in water-soluble plasticizer capsules is commonly used polyethylene glycol 200, polyethylene glycol 400, propylene glycol and so on. Water-insoluble plasticizer castor oil, acetylated monoglycerides, phthalic acid esters, etc. According to chemical structure:

9. No-bridging or filling of the debossed tablet surfaces by the film former. 10. Ease of printing procedure on high-speed equipment. Film coating formulations usually contain the following components. Polymer, Plasticizer, Colourants / Opacifiers, Solvent / Vehicle. Polymers / Film Formers. form a clear, non-tacky, mechanically strong film

The process of film coating involves the deposition of a thin, but uniform polymer-based formulations onto the surface of solid dosage forms such as tablets, capsules, powders, granules, or pallets under conditions that permit: Balance between, and control of, the coating liquid delivery rate and drying process.