FDA 21 CFR Compliance Guide for Food-Grade Plastic Bottles – Technical Requirements 2026

What FDA food-contact compliance actually means

“Food grade” is not a certification, and there is no FDA certificate that declares a bottle fit to touch food. What exists is a citation. The polymer has to fall inside a specific section of 21 CFR Part 177, and every substance added to it — colourant, antioxidant, slip agent, processing aid — has to be independently cleared. Compliance is therefore a documentary chain that runs from the pellet supplier through the converter to the filled bottle, and the bottle is the last link in it, not the first.

This is worth stating plainly because the failure mode is so common. Buyers ask for an “FDA certificate” that has never existed. Suppliers answer with a letter that says “FDA approved” and names no section. In practice that letter is worth nothing at customs and nothing in an audit — what a reviewer wants is the section number, and then evidence that every input in the formulation is covered by one.

Regulatory Framework

Part 177 lists permitted polymers with their use limits. Each polymer family has its own section, which is why a bottle cannot be “FDA compliant” in the abstract — it is compliant as a particular polymer, from a particular supplier, for a particular set of conditions.

Alongside the polymer sections sit the conditions of use, A to H in Table 2 の 21 CFR 176.170(c). These define the temperature envelope — frozen, refrigerated, room temperature, hot filled, sterilised — and the food type. A resin cleared for use A through H is not automatically cleared for a hot-fill application if its clearance names a narrower range. When a customer asks whether a bottle suits a 92°C fill, the answer lives in this table, not in a marketing sheet.

There are four routes by which a substance reaches food-contact clearance: it was prior sanctioned before 1958, it is GRAS, it is listed directly in Part 177 または 178, or it is covered by a Food Contact Notification (FCN) — the route used for substances cleared since 2000. An FCN is company and use specific, so a supplier citing an FCN number should be able to show that the notification actually covers your polymer and your conditions of use.

Material Requirements

For olefin bottles the regulatory numbers are not vague targets — they are written into the standard. Section 177.1520(c) sets density, melting or softening point, and two extractable fractions for each grade, and it is these figures a resin certificate is measured against.

Two things follow. First, the n-hexane and xylene figures are percentages by weight of the polymer, not area-based limits — an “extractables” claim quoted in mg per square inch is a different measurement and cannot be checked against this table. Second, the cooking-use polyethylene row is why a container intended for cooking is a different specification from the same polymer used for cold fill, even though the density range is identical.

On the additive side, the colourant section is the one that catches buyers out. Most pigments listed in 21 CFR 178.3297 carry a ceiling of not more than 1 percent by weight of the polymer, and many are further restricted to specific conditions of use — several are cleared only for use B through H, which excludes the top of the temperature envelope. A masterbatch statement that lists a pigment name without its use limit is not evidence of compliance. Ask for the section, the limit and the conditions of use, per colourant.

Recycled content follows its own path. PCR in a food-contact bottle is not automatically cleared because virgin resin of the same polymer is: the recycler’s process has to be reviewed, and in the United States that is normally done through a letter of no objection covering the specific recovery process and the intended use. If a supplier offers rPET without being able to name that document, treat the claim as unverified. See our comparison of PET, HDPEおよびPP樹脂 for how the three behave in service.

Migration Testing Protocol

There is a widespread assumption that FDA sets a single migration ceiling for plastics, the way EU Regulation 10/2011 sets an overall migration limit of 10 mg/dm² of food-contact surface. It does not. In the FDA framework the numerical limits are written into each polymer’s own section — the n-hexane and xylene extractable fractions above are the regulatory numbers — and beyond those, the testing programme is designed from the conditions of use rather than from a fixed pass mark.

That design has three variables: の food type, の temperature, and the contact time. The choice of extracting solvent follows from the food type — aqueous and acidic foods, alcoholic foods, and fatty foods each need a different simulant, with n-heptane or a fatty simulant standing in for oils and fats. The temperature and duration follow from the worst realistic case in the intended use. Get the conditions of use wrong — test at ambient when the product will be hot filled — and the data describes a bottle nobody is selling.

PET is the case where a single compound drives the whole specification. Acetaldehyde migrates readily, and at low levels it is perceptible in water and soft drinks as a fruity or solvent note. Bottle-grade resin is therefore supplied to an AA ceiling — a typical bottle-grade data sheet specifies not more than 1.0 ppm, alongside intrinsic viscosity around 0.75 dL/g and moisture below 0.30% — and the processor protects that number by controlling drying, melt temperature and residence time. AA is generated in the barrel, so a resin that arrives inside specification can still produce an out-of-specification bottle. This is one reason hot-fill and high-temperature processing routes are specified separately for PET.

Heavy metals are the other place where a single number is often quoted and rarely correct. Lead, cadmium, mercury and hexavalent chromium are controlled through the resin supplier’s specification and, for European shipments, declared in the declaration of compliance — not through one universal ppm ceiling that applies to every application. Ask for the actual figures against the limit that applies to your market rather than accepting a summary.

Documentation Requirements

The compliance package is the deliverable. A bottle that is genuinely compliant but cannot document it will fail a supplier audit just as surely as a non-compliant one, and in practice the document set is what a brand owner’s quality team reviews before placing an order.

The traceability line is the one buyers undervalue. If a migration issue is identified twelve months later, the only way to bound it is to know which bottles were made from which resin lot. A converter that cannot produce that link at lot level is asking the brand owner to carry the whole of the recall risk.

Third-Party Certifications

Certification schemes answer a different question from the CFR citation, and it is worth being precise about which is which, because two commonly quoted schemes are frequently mixed up.

NSF/ANSI 51 covers materials and components of food equipment — surfaces and articles used in preparation and service. It is not the packaging standard, and a bottle does not become food-contact compliant by virtue of it. For packaging materials the relevant third-party schemes are BRCGS Packaging Materials, FSSC 22000 and the ISO 22000 family: these certify that the manufacturing environment and quality system are controlled, which is a real and separate assurance, but they do not replace the CFR citation for the polymer.

For bottles going into pharmaceutical or nutraceutical use, the applicable scheme is ISO 15378 — the application of ISO 9001 to primary packaging materials for medicinal products, with GMP requirements layered on top. The current base edition is ISO 15378:2017, extended by the 2024 climate-action amendment. We cover the practical consequences of that split in our guide to ISO 9001 and process control in bottle manufacturing, and the moisture side of the same problem in our note on HDPE moisture barrier performance.

So the practical answer to “are you FDA compliant” has three parts: the polymer’s CFR section, the clearance route for every additive, and the migration data tied to a named condition of use. Any supplier who can produce all three has done the work. Any supplier who answers with the words “food grade” has not answered the question.

What hot fill changes about the compliance question

Every condition of use in the table above matters most at the top of the temperature envelope. A hot-fill line runs at 82–88 °C, which is above the glass transition of standard PET — so the same bottle and closure that pass at room temperature can fail on a hot line, not because the polymer citation changed but because the conditions of use named in the clearance did not cover it.

Three things move together on a hot-fill project. The resin has to be specified for the fill temperature, which usually means a heat-set grade whose crystallinity and glass transition are raised during blow molding rather than after it. The bottle geometry needs vacuum panels and a reinforced base so that the internal vacuum formed on cooling is absorbed by design rather than by deformation. And the closure and liner need their own heat resistance, since a cap that softens at 85°C undoes the whole container. The process detail is in our analysis of PET thermal stability for hot-fill applications up to 85°C.

None of that is visible in a certificate, and none of it can be retrofitted after tooling. The mold that forms the panels and the base is part of the specification from the start — see how bottle mold design decisions carry through to production — and the system that verifies each batch against them is a separate question again, covered in our guide to quality control and regulatory compliance in bottle manufacturing.

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Browse FDA-compliant food-grade PET bottles, HDPEボトル, PP bottles そして PET jars, または request a quote with your food-contact application. If you are still working out quantities and tooling, start from our MOQ, lead time and pricing guide, or browse the full product range. To evaluate a supplier’s compliance claims on real product, request samples with the document set attached.