Any plastic that touches food destined for the United States falls under the FDA food contact plastic framework, whether it is a container, a gasket, a conveyor belt or the inside of a closure. For importers, compliance is less about a single certificate and more about a chain of evidence: the resin must be covered by an applicable regulation or notification, the finished article must not introduce unsafe levels of migration, and the documentation must prove both. This guide walks through the framework, what 21 CFR 177 actually covers, and what to demand from a supplier before the container leaves the factory.
The FDA Food Contact Plastic Framework
FDA regulates food contact substances as indirect food additives under 21 CFR Parts 170-189. A substance is cleared for food contact through one of five routes:
| Route | What it means | Buyer takeaway |
|---|---|---|
| Food Contact Notification (FCN) | Manufacturer-specific clearance for a new substance | Valid only for the notifying company; a substitute resin needs its own FCN |
| GRAS | Generally Recognised As Safe for the intended use | Often self-affirmed; ask for the basis, not just the claim |
| Prior sanction | Approved before the 1958 Food Additives Amendment | Rare in modern plastics; mainly historical |
| Threshold of Regulation (TOR) | Exempt where migration is below 0.5 ppb with no carcinogen concern | Common for minor additives and processing aids |
| Existing regulation | Listed in 21 CFR 174-179 for the stated conditions | The mainstream route for commodity resins |
What 21 CFR 177 Covers
Part 177 is the section of the indirect additive regulations that authorises polymers for food contact use, and it is organised by resin chemistry. The sections that matter most to everyday importers include 177.1520 for olefin polymers such as PE and PP, 177.2410 for polyethylene terephthalate, 177.1580 for polycarbonate, 177.1500 for nylon resins and 177.1310 for melamine-formaldehyde. Each section lists the permitted starting substances, the finished-polymer specifications and any use limitations such as temperature or food type. Adjacent sections matter too: Part 174 sets general requirements, Part 175 covers adhesives and coatings, and Part 178 lists adjuvants, production aids and sanitisers - which is where antioxidants, slip agents and mould release agents are cleared.
Two practical consequences follow. First, food grade is not a property of the pellet but of the finished article under its conditions of use: the same PP resin can be compliant for a dry-food tray and non-compliant for a hot-fill application. Second, additives and colourants live outside the polymer section, so a resin that is compliant on paper can be pushed out of compliance by an uncited pigment or processing aid.
Documents Importers Should Require
- Food contact declaration or letter of guarantee naming the applicable regulation sections and the intended use conditions.
- Certificate of analysis for the production lot, including additive and colourant identity.
- Third-party migration test reports where the buyer's market or customer requires them, with the food simulant, temperature and duration stated.
- Resin datasheet with regulatory citations rather than a generic food grade statement.
- Change-control commitment covering resin source, additive package and masterbatch, since substitutions silently break compliance.
Common Compliance Gaps
Most border and customer-audit failures in this category trace back to four gaps. Recycled or reworked resin introduced without notifying the buyer. Printing inks, coatings or adhesives applied to the food-contact surface that were never evaluated. A supplier substitution - a cheaper colourant, a different filler - that changes the migration profile. And claims of FDA approval attached to a company rather than a substance, which is a category error: FDA does not approve factories or finished products, it regulates substances and sets the conditions under which those substances are cleared.
A Short Verification Routine
Before each shipment, confirm that the declaration matches the resin actually used, that test reports reference the correct simulant and conditions, and that any change since the last order has been re-documented. Our overview of food contact plastics basics covers the FDA, EU and LFGB frameworks side by side, the guide to food-grade plastic bottle certifications works through the same documents for bottles, and the wider certification guides collection covers the surrounding regimes. Manufacturers with documented food contact programmes can be shortlisted through our supplier directory.
Related product categories
The materials and part types discussed above are grouped in our sourcing directory:
