Is it necessary to include a chemical identification test in a specification for a packaging component (such as a plastic bottle)? Must this chemical identification (ID) be conducted for each lot received? Would vendor certification be considered an acceptable substitution for testing upon receipt?

If the type of material is described on the Certificate of Analysis (C of A) and if a specific test has been
performed by the fabricator of the packaging materials confirming the identity of the starting polymer used to
manufacture a specific lot, it is not necessary to repeat the chemical ID (such as Infra-Red). But each lot of
packaging materials should be visually examined to confirm the identity.