FDA 21 CFR 177: plastic grades cleared for food contact

FDA food contact plastic does not arrive with a single certificate that covers any part you care to make. The rule behind it, 21 CFR 177, lists polymers and the conditions under which they may be used, and it is the conditions that most buyers overlook. Knowing how the regulation is built makes it far easier to ask a supplier for the right document instead of a vague letter.

This summary is written for buyers and engineers rather than regulatory specialists. It covers where the polymer sections sit, which grades appear there, what a compliant declaration should say, and the point at which compliance stops being the supplier’s call and becomes the customer’s decision.

How 21 CFR 177 is structured

Part 177 sits under Title 21 of the US Code of Federal Regulations and deals with indirect food additives: substances that may migrate into food from packaging, equipment or processing surfaces. It is organised by polymer family rather than by finished product. Each section names a base polymer, the additives permitted with it, and the extraction or temperature conditions under which it may be used.

Two ideas run through the whole part. First, the composition is what is cleared, not the shape, so a listed polymer stays listed whether it arrives as sheet, rod or a machined part. Second, clearance is conditional: a polymer cleared for room-temperature storage may not be cleared for boil-in-bag service, so the condition matters as much as the polymer itself. A purchase order that quotes only the polymer name is only half-specified.

Grades covered by the regulation

Most of the stock-shape polymers we supply have a home in the regulation. Olefin polymers, which include polyethylene and UHMW-PE, appear under 177.1520, while acetal has its own polyoxymethylene sections. Fluoropolymers are treated separately again, and some high-performance grades fall outside Part 177 or are cleared only through a specific grade notification. Food and beverage is one of the industries we serve, so these questions come up often.

That last point catches people out. A polymer family can be well known as food-safe in one grade and not covered in another, because the additive package differs. Where a grade is not named in the regulation, the route to compliance for an FDA food contact plastic part is a manufacturer’s declaration backed by migration data rather than a CFR citation, and that is a different conversation.

Common conditions of use A through H

The regulation uses a set of lettered conditions of use. They run from high-temperature heat sterilisation, through boiling-water and hot-fill service, down to room-temperature fill and storage, then refrigerated and frozen handling. A grade may be cleared for some of these and not others, and the difference between them is the temperature and the contact time. Those two variables decide whether a polymer that is fine in one application becomes unsuitable in another.

When a supplier says a material is food grade, the useful follow-up is always: under which condition of use? In our experience the mismatches happen at the hot end. A part that is fine for ambient storage may not be cleared for repeated steam sterilisation, even though the polymer is the same. If your process runs above about 66 °C, or involves steam, say so early and let the grade be chosen around it.

What a compliant declaration must contain

A usable declaration names the exact grade and its identifier, states the regulation section or the basis for clearance, and lists the permitted conditions of use. It should identify the food types the material is cleared for, whether fatty, aqueous, acidic or alcoholic, because migration depends on the food and not only on the polymer. A one-line letter saying food grade is not a declaration. A declaration that cannot be traced to a specific batch is of limited use if a problem appears later.

The UHMW-PE and acetal grades we hold are supplied with declarations from the resin maker, and those are passed on with the order. Where a declaration is missing, it is worth pausing the order rather than proceeding on the strength of a property table in a datasheet.

Migration testing and EU 10/2011 in parallel

For many buyers the practical compliance target is not CFR 177 alone but the EU framework under Regulation 10/2011, which sets overall and specific migration limits and has its own positive list of permitted substances. A part can satisfy both, but the two are not interchangeable, and a CFR citation will not satisfy an EU reviewer. The two frameworks also differ in how they treat additives and processing aids, so evidence for one is not evidence for the other.

Migration testing is food-contact specific: the result depends on the simulant, the temperature and the contact time. Where a high-temperature PEEK or UHMW-PE part is involved, testing over the full service temperature is more useful than a single room-temperature result. Our food grade plastics guide sets out the documents we can supply with each grade. If you need both, it is worth asking for the two sets of evidence at the same time rather than one after the other.

Questions buyers ask about FDA food contact plastic

Does a CFR 177 listing cover a machined part or only the raw polymer?

The clearance sits with the composition, so a listed polymer stays listed after machining. But machining introduces coolants, lubricants and packaging that the CFR section does not cover, so the material may be compliant while the finished part is not if the process adds something unauthorised.

What should a food contact declaration contain?

Grade identity, the regulation section or basis for clearance, the permitted conditions of use, and the food types the material is cleared for. If any of those is missing, treat the letter as a datasheet note rather than a declaration.

Is FDA compliance the same as EU 10/2011?

No. The two systems have different positive lists and different migration limits, and a CFR citation will not satisfy an EU reviewer. If you sell into both markets, ask for evidence against each framework separately.

Who decides whether a part is compliant for a given food?

The final call sits with the food producer, not the material supplier. The supplier provides the grade, the declaration and the migration data; the producer matches that to the actual food, temperature and contact time in their process.