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Plastics for ophthalmics are composed of a mixture of homologous compounds, having a range of molecular weights. Such plastics frequently contain other substances such as residues from the polymerization process, plasticizers, stabilizers, antioxidants, pigments, and lubricants. Factors such as plastic composition, processing and cleaning procedures, contacting media, inks, adhesives, absorption, adsorption and permeability of preservatives, and conditions of storage may also affect the suitability of a plastic for a specific use.
Definition— For the purposes of this chapter, a container is that which holds the drug and is or may be in direct contact with the drug.
Biological Tests— Plastics and other polymers used for containers for ophthalmics meet the requirements set forth in the section Biological TestsPlastics and Other Polymers.