“FDA Approval” can only be issued for a product manufactured in the particular facility in question. For specific components and materials in these products, there is no FDA approval; these parts are “FDA listed” in terms of their innocuousness if in direct contact with the product.
FDA directives are published as “Codes of Federal Regulations” (CFR…). The 21 CFR 170-199 directives have a special significance, in particular with regard to material section for sensor manufacturers. They contain a listing of specific guidelines for plastics. 21 CFR 177.2415, for example, contains the plastic PEEK that is often used in the food and Life Sciences industries.
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