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Polyisoprene

Polybutene

Polyisobutylene

Ethyl acrylate 2-Ethylhexyl acrylate Isooctyl acrylate

Polydimethylsiloxane Polysilicate resin Siloxane blends membranes, allowing slow diffusion of solute or some delayed diffusion by acting as gel layers. Materials that have been used as film formers include shellac, zein, glyceryl stearates, paraffins and a range of anionic and cationic polymers such as the Eudragit polymers (XX to XXIII). Newer materials used for the same purpose include cellulose acetate phthalate.

Different film coats applied to tablet surfaces can lead to quite different rates of solution.

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