[Characterization and simultaneous assay of polymers and additives composing multilayer plastic material for pharmaceutical use by FTIR].

Multilayer plastic materials provide useful solutions for primary pharmaceutical formulae (maintaining physical properties, compatibility with contents, protection against exterior agents). Fourier transform infrared spectometry is an ideal method to identify and quantify the different polymers and additives. Each functional group has a characteristic band which can be selected and rapidly identified for routine quality control. The proportional quantities of each polymers in the multilayer system can be determined directly using the characteristic bands for each functional group. The technique was applied to the analysis of heat-formed platelets made of polyvinyl chloride and polyvinylidene chloride.