Migration Testing for Food-Contact Packaging: Overall vs Specific Limits

Migration testing measures how much chemistry moves from packaging into food. Gulf import controls increasingly ask for it alongside halal certificates, and EU rules set the template most Gulf standards mirror. This guide explains what the tests prove, when they are required, and how to commission and read one. For Gulf market context see our UAE market guide and the MOIAT certifier profile.

What migration testing actually measures

A finished pack is a chemical system: monomers, additives, plasticisers, inks, adhesives and coatings can all transfer — migrate — into food, especially with heat, fat content and long storage. Testing exposes the material to food simulants (standardised liquids standing in for watery, acidic, alcoholic and fatty foods) under worst-foreseeable time and temperature conditions, then measures what moved. Two different limits apply to the results, and confusing them is the most common buyer error.

Overall vs specific migration: the two numbers that matter

• Overall migration limit (OML) — the cap on everything that migrates, taken together. Under EU Regulation 10/2011 the OML is 10 mg per dm2 of food-contact surface (or 60 mg per kg of food, the expression used for infant food contact materials). Gulf standard GSO 1863/2013 mirrors this: below 10 mg/dm2 or 60 mg/kg.
• Specific migration limits (SMLs) — per-substance caps for individually listed chemicals, expressed in mg per kg of food. Where the EU positive list sets no SML for a substance, a generic 60 mg/kg cap applies. Gulf rules track the EU positive-list structure closely.
• Passing OML but failing one SML still means failure — both gates must be cleared on the same test programme.

When GCC and EU import rules require it

In the EU, plastic food-contact materials must comply with Regulation 10/2011 as a condition of market access, with declarations of compliance flowing down the supply chain. In the Gulf, GSO 2231/2012 sets the general food-contact safety frame and GSO 1863/2013 carries the plastics detail; Saudi Arabia enforces these mandatorily through SFDA, whose import-control arm samples consignments at port — documentation checks, identity checks and laboratory testing — with non-compliant goods re-exported or destroyed. Exporters should therefore treat migration evidence as part of the standard Gulf technical file (alongside the halal certificate and label approvals), not as an optional extra. Confirm the current edition and national adoptions with your lab, since Gulf states adopt GSO texts with local variations.

Common failures: what actually trips test reports

• Plasticisers in flexible films and closures — phthalate and alternative plasticiser SMLs are frequent failures where film formulations were chosen for cost, not compliance.
• Printing inks and adhesives — set-off transfer (ink from the outer printed face migrating through the reel or stack onto the food-contact face) is a classic surprise failure.
• Recycled board and plastics — mineral-oil residues and legacy additives from unknown feedstock; recycled content without challenge-test backing fails disproportionately.
• Heavy metals and residual monomers — Gulf container standards cap both migration (typically 60 mg/kg overall) and specific elements such as lead, arsenic and chromium; vinyl chloride, styrene and acrylonitrile residues are controlled in the plastics standard.
• Wrong simulant or condition — testing a fatty-food pack only in water simulant, or at ambient temperature for a hot-fill application, produces a passing report that proves nothing.

How to commission a test: lab, simulants, timelines

Use an ISO 17025-accredited laboratory with a food-contact scope covering the destination regulation — ask explicitly whether they test to GSO 1863/2013 as well as EU 10/2011, since simulant assignment and editions differ in detail. Supply the lab with the finished article (not just resin pellets), the food type, the worst-case contact time and temperature, and the destination market list. Typical timelines run two to six weeks depending on whether long-term storage conditions must be simulated — confirm the schedule before you promise ship dates, and budget for retesting if the first formulation fails.

Reading a test report: five checks before you file it

• Both OML and every applicable SML are reported against named limits — not just a blanket pass statement.
• Simulants and test conditions match your real use (fatty-food simulant for fatty foods; hot-fill or oven conditions where relevant).
• The tested sample is identified as the finished article with batch or lot traceability.
• The report cites the regulation edition tested against (for example EU 10/2011 as amended, GSO 1863/2013).
• Declarations of compliance from upstream suppliers are attached, so the chain from resin to finished pack is documented. Keep the report with the halal certificate and label file: Gulf reviewers increasingly expect the full set together.