Indirect Food Additives — Paper & Paperboard

21 CFR Part 176 is the FDA regulation governing indirect food additives in paper and paperboard components. The phrase indirect food additive is the key to understanding it: these are substances that are not added to food deliberately but may migrate into it from the packaging or processing material that touches it.

The regulation is divided between components of paper and paperboard in contact with dry food (§ 176.180) and components in contact with aqueous and fatty food (§ 176.170) — the latter being considerably more demanding, since moisture and fat pull substances out of the substrate far more readily. Sub-sections such as § 176.260 address specific substances.

The regulatory logic to grasp is that Part 176 works as a permitted-list regime. A substance used in a food-contact paper component must be authorized — through Part 176 itself, another food-additive regulation, a Food Contact Notification, prior sanction, or a valid determination that it is Generally Recognized as Safe or otherwise exempt. Absent one of those routes, the substance is not permitted, and the food-contact article is adulterated.

Part 176 reaches:

• Paper and paperboard mills producing food-contact grades
• Converters producing cartons, boxes, cups, plates, wraps, bags and liners
• Manufacturers of coated, laminated or treated papers for food use
• Producers of baking papers, filters, interleaving and release papers
• Suppliers of adhesives, coatings, sizing agents, wet-strength resins and processing aids used in food-contact paper
• Brand owners and food manufacturers who must satisfy themselves their packaging is compliant
• Importers of food-contact paper products into the United States

The most common way this becomes urgent is a customer request. A food manufacturer, retailer or brand owner asks for a letter of compliance or food-contact declaration, and the supplier discovers it cannot substantiate one — because compliance depends on the full formulation of every component, including substances added upstream by its own suppliers.

That upstream dependency is the crux of the problem. You cannot declare compliance for a product whose composition you do not fully know.

A defensible compliance position needs:

• Full composition knowledge — every substance in the finished article, including coatings, adhesives, sizing agents, wet-strength resins, defoamers, biocides and processing aids
• Supplier documentation establishing the regulatory status of each substance, obtained and retained rather than assumed
• Identification of the authorization route for each substance — Part 176, another additive regulation, an FCN, prior sanction, or GRAS
• Conditions-of-use verification — many authorizations carry limits on food type, temperature, duration of contact and concentration. A substance permitted for dry food contact may not be permitted for fatty food.
• Intended-use definition — what food types, at what temperatures, for how long. This determines which requirements apply and is where declarations most often overreach.
• Extraction testing where the regulation specifies limits, using the prescribed food simulants and conditions
• Change control — a formulation or supplier change can invalidate the position, so changes must trigger re-evaluation
• A written compliance statement that is accurate about scope and conditions, not a blanket assurance
• Records supporting all of it

Note also that recycled fibre introduces additional diligence, since the input composition is inherently less controlled — and that state-level restrictions on substances such as PFAS in food packaging now sit alongside the federal position and are moving quickly. A product can satisfy Part 176 and still be unlawful to sell in particular states.

Customers require it. Food manufacturers and retailers cannot accept packaging without a compliance position, because their own product becomes adulterated if the packaging is non-compliant. No letter, no order.

Regulatory exposure. A non-compliant food-contact article renders the food adulterated under the Federal Food, Drug, and Cosmetic Act, with recall and enforcement consequences that land on your customer and then on you.

Over-broad declarations are the real trap. The most frequent problem we encounter is not an unauthorized substance — it is a compliance letter written more broadly than the evidence supports. A supplier declares general food-contact compliance when the substantiation covers dry food only, and the customer then uses the material for a fatty application. The paperwork created the liability.

The PFAS dimension is live. Intentionally added PFAS in food packaging is now restricted in a growing number of states, and this area has been changing rapidly. Any compliance position written a few years ago should be revisited on this point specifically.

We bring 30+ years of food and packaging compliance work, 900+ organizations certified, and relevant depth in NSF/ANSI 2, BRCGS packaging, GMI and ISO 15378 — where the same discipline of composition control and supplier documentation applies.

We start by defining intended use precisely, because everything follows from it: which food types, what temperatures, what contact duration. Then we build the composition inventory for each product and pursue the supplier documentation to establish the regulatory status of every substance — which is usually the longest part of the job, since it depends on suppliers who may not be accustomed to being asked.

We identify the authorization route for each substance, verify conditions of use against your actual application, arrange extraction testing where the regulation requires it, and then write compliance statements that are accurate about scope rather than comfortably broad. We put change control in place so a reformulation or supplier substitution triggers re-evaluation instead of silently invalidating the position, and we flag state-level restrictions including PFAS.

Most organizations reach a documented compliance position in about 3 to 6 months. We should be clear that formulation questions at the regulatory boundary can require specialist regulatory or legal input, and we will say so when that point is reached.

• Issuing a compliance letter broader than the evidence — general food-contact language when only dry-food use is substantiated
• Not knowing the full composition, because coatings, adhesives and processing aids came from suppliers who were never asked
• Assuming a substance is permitted because it is widely used in the industry
• Ignoring conditions of use — food type, temperature, contact time — attached to an authorization
• No change control, so a reformulation or supplier switch quietly invalidates the declaration
• Treating recycled fibre as equivalent to virgin without additional diligence on input composition
• Overlooking state-level PFAS restrictions, which can make a federally compliant product unlawful to sell in certain states
• Relying on a supplier's verbal assurance with nothing retained on file
• Skipping extraction testing where the regulation specifies limits and prescribed simulants