California’s Proposition 65 produces more supplier questions than any other single labelling rule, mostly because it applies to products sold in one US state and can be triggered by materials nobody thinks of as ingredients. Packaging is squarely in scope: inks, adhesives, coatings and even the board itself can contain listed substances, and a warning may be required on the pack or the label. The following is general information, not legal advice – confirm your position with a qualified advisor before printing anything.
What does Prop 65 actually require? A warning before exposing Californians to chemicals the state has listed as causing cancer or reproductive harm. The list runs to hundreds of substances and grows annually. Businesses with ten or more employees that knowingly expose consumers must provide a “clear and reasonable warning” – which in practice means specific wording, in a specific format, in a place the consumer sees before purchase.
Does packaging count as an exposure? It can. Handling a printed carton, touching a coated surface, or using a product that contacts packaging materials are all potential exposure routes. In practice the risk is highest where the pack is held, opened or used repeatedly, and lowest where packaging is discarded immediately – but those judgements need a materials review rather than an assumption.
Which packaging materials raise the question? Certain pigment systems containing heavy metals, some older ink formulations, PVC-based films and windows, and specific adhesives and plasticisers. Recycled board can carry trace contaminants from its feedstock. The pattern is that recycled content and complex laminates deserve more scrutiny, not less – which sits alongside the wider compliance picture in the food contact, REACH and RoHS guide.
What does a compliant warning look like? A symbol – a yellow triangle with an exclamation mark for cancer, or an orange one for reproductive harm, or both where relevant – followed by the prescribed wording naming the chemical and the endpoint. Short-form warnings exist for small packs, with limits on how much can be abbreviated. The exact text matters; paraphrasing a warning is not a safe shortcut.
Where does the warning go on packaging? Where the consumer will see it before purchase: on the primary display panel for retail goods, or on a label where the pack itself cannot carry print. For very small packs, supplemental labelling or shelf signage is sometimes permitted. In e-commerce, the warning must appear on the product page as well as on the physical item.
Can the warning be avoided by changing materials? Frequently yes, and that is the better commercial answer for many brands. Reformatting to a heavy-metal-free pigment set, swapping a PVC window for PET or a paper window, or specifying a low-migration ink system can remove the listed substance from the analysis and with it the warning. The trade-off is usually colour vibrancy or cost, not feasibility.
How is the risk assessed? Normally by a laboratory exposure assessment of the finished article, considering how a consumer handles it and for how long. Results are compared against the applicable maximum allowable dose levels. Assessments are structure-specific: the same ink on a different substrate with a different handling profile can produce a different conclusion, so a report for one pack does not automatically cover the range.
Do all US states follow the same rules? No. Prop 65 is California-specific, and other states have their own chemical disclosure requirements emerging. Selling nationally means satisfying the strictest applicable regime in the pack you print once, which is usually why brands opt for a warning rather than a state-by-state design.
What should a supplier provide? Material declarations for board, ink, coating and adhesive; a statement of whether any Prop 65-listed substance is intentionally added; and enough formulation detail for your lab or advisor to run an assessment. Suppliers cannot decide your warning obligation for you, but they can make the assessment possible – the documents that usually travel with an order are listed in the export documents FAQ.
If Prop 65 has come up on a US listing and you need to know what is in the materials, ask us for the declarations before you print. Send the market and structure through the quote request page and we will tell you which ink and window options reduce the question.
Chengtop runs folding cartons, cosmetic boxes and rigid boxes at our Wuhan plant and can quote alternative material sets where a listed substance is a concern. Message us with the target market and we will send the material documentation we hold.
