Separating Film

About separating films

A tinfoil substitute is a sodium alginate solution that reacts with the calcium in the gypsum cast to form calcium alginate, an insoluble film. That film acts as a barrier between the polymerising resin and the moisture and salts of the gypsum. The shelf carries film-forming liquids of this kind and pure tin foil.

Forms a film on the gypsum, between the cast and the denture resin.

Sources: The Glossary of Prosthodontic Terms, 9th edition (J Prosthet Dent 2017)