Hazardous substances testing for packaging materials is the analytical process of identifying and quantifying regulated chemicals, such as heavy metals, phthalates, formaldehyde, and migrating monomers, in paper, plastic, metal, glass, and composite packaging. Testing against frameworks such as EU Directive 94/62/EC, REACH, EU Regulation 10/2011, and China's GB 4806 series helps manufacturers secure market access, protect consumer safety, and demonstrate due diligence across global supply chains.
Technical Overview
Hazardous substances testing for packaging materials refers to the systematic identification and quantification of restricted chemicals in packaging structures, including folding cartons, corrugated boxes, plastic films and bottles, metal cans, glass containers, laminates, and the inks, coatings, and adhesives used with them. The objective is twofold: to prevent the transfer of harmful substances into food, pharmaceuticals, cosmetics, and other consumer products, and to demonstrate compliance with the chemical restrictions that govern packaging placed on global markets.
The principal regulatory drivers for packaging chemical testing include:
- EU Directive 94/62/EC on packaging and packaging waste, which limits the total concentration of lead, cadmium, mercury, and hexavalent chromium to 100 mg/kg in any packaging component.
- The TPCH model legislation in the United States (formerly the CONEG model), which applies the same 100 ppm aggregate heavy-metal limit and, in its updated version, also restricts intentionally added PFAS and ortho-phthalates in packaging.
- EU Regulation (EC) No 1935/2004 and EU Regulation (EU) No 10/2011, which require that food-contact materials do not transfer substances in quantities endangering human health, with an overall migration limit of 10 mg/dm² and substance-specific migration limits (SMLs).
- China's GB 4806 series of national food-contact material standards, the GB 9685 additive positive list, and the GB 31604 series of test methods.
- US FDA food-contact regulations under 21 CFR 174–190 for indirect food additives.
- REACH, including the regularly updated SVHC candidate list (more than 240 entries) and Annex XVII restrictions such as the 0.1% limits on DEHP, DBP, BBP, and DIBP in plasticized materials.
Hazardous substances rarely originate in the base substrate itself; they are typically introduced through printing inks (photoinitiators, primary aromatic amines, heavy-metal pigments), laminating adhesives (residual solvents, amines), can coatings (bisphenol A in epoxy systems), plastic additives (phthalate plasticizers, antioxidants, slip agents), recycled fibers (mineral oil saturated hydrocarbons, MOSH, and mineral oil aromatic hydrocarbons, MOAH), and functional treatments such as fluorinated grease-proofing agents. This is why professional test programs address finished packaging as well as inks, coatings, adhesives, and masterbatch as separate sample matrices.
Two complementary assessment philosophies apply. Total-content testing measures how much of a substance is present in the material itself, expressed in mg/kg, and forms the basis of packaging heavy-metal limits. Migration testing measures how much of a substance transfers into a food simulant or product under defined time and temperature conditions, and forms the basis of food-contact compliance. A robust strategy usually combines both, together with screening for non-intentionally added substances (NIAS) when recycled content or functional barriers are involved.
Testing Samples
Accredited third-party laboratories accept a wide range of packaging matrices. Because the sample matrix determines the applicable digestion and extraction procedures, packaging is generally categorized as follows:
Plastic Packaging
Mono- and multilayer films, bottles, jars, closures, trays, and laminates produced from PE, PP, PET, PVC, PS, PC, PA, EVOH, and biopolymers such as PLA. Testing focuses on residual monomers (vinyl chloride, styrene, caprolactam, bisphenol A), plasticizers, antioxidants, slip agents, and overall and specific migration behavior.
Paper and Paperboard
Corrugated boxes, folding cartons, paper bags, wrapping papers, molded pulp, and paper cups. Key concerns include formaldehyde, optical brighteners, heavy metals in pigments, per- and polyfluoroalkyl substances (PFAS) in grease-resistant grades, and MOSH/MOAH carryover from recycled newsprint and board.
Metal Packaging
Aluminum and steel cans, can ends, lids, aerosol containers, and metal closures. Testing targets residual bisphenol A and BADGE, BFDGE, and NOGE epoxy derivatives, bisphenol S alternatives in newer lacquers, and metal ion release (Al, Fe, Sn, Cr, Ni) influenced by internal coatings.
Glass and Ceramic Packaging
Bottles, jars, and decorated glassware. Testing addresses lead and cadmium release from decorations, glazes, and lid gaskets using hot-acetic-acid extraction procedures consistent with ISO 6486 and ASTM C738.
Inks, Coatings, Adhesives, and Auxiliary Materials
Printing inks, overprint varnishes, can lacquers, laminating and pressure-sensitive adhesives, sealing compounds, and color masterbatch are tested as raw materials to control contamination at the source, covering photoinitiators, primary aromatic amines, residual solvents, alkylphenols, and restricted pigments.
Wooden and Composite Packaging
Pallets, crates, plywood panels, and engineered wood dunnage are assessed for formaldehyde release using chamber and gas-analysis methods aligned with the EN 717 series and corresponding GB emission classifications.
Testing Items
Test portfolios are constructed around statutory limits, customer specifications, and risk analysis of the converting process. The most commonly requested items are summarized below:
- Heavy metals (total content): lead, cadmium, mercury, and hexavalent chromium, with a combined limit of 100 mg/kg under EU Directive 94/62/EC and TPCH.
- Element migration: antimony, arsenic, barium, cadmium, chromium, lead, mercury, and selenium extracted under acidic conditions analogous to EN 71-3.
- Phthalates: DEHP, DBP, BBP, DIBP, DINP, DIDP, DNOP, and total ortho-phthalate content.
- Bisphenols: bisphenol A, bisphenol S, bisphenol F, BADGE and its hydrolyzed and chlorinated derivatives, BFDGE, and NOGE derivatives.
- Aldehydes: formaldehyde and acetaldehyde, including extractable formaldehyde in paper and board.
- Volatile organic compounds and residual solvents: benzene, toluene, ethylbenzene, xylenes, ketones, and residual printing and lamination solvents.
- Mineral oils: MOSH and MOAH fractions (typically C10–C50) in recycled board and food-contact paper.
- PFAS: PFOA, PFOS, PFHxS, related carboxylates and sulfonates, and total organic fluorine screening.
- Primary aromatic amines: aniline, toluidines, methylenedianiline, and related species originating from polyurethane adhesives.
- Photoinitiators: benzophenone, 4-methylbenzophenone, 2-isopropylthioxanthone (ITX), and aminobenzoate co-initiators.
- Alkylphenols: nonylphenol, octylphenol, and their ethoxylates.
- SVHC screening: targeted REACH candidate-list verification and full-scan screening against the current list.
- Food-contact migration: overall migration and specific migration of listed monomers and additives with SMLs.
Testing Methods
Method selection depends on the substance class, the matrix, and whether a total-content or migration-based limit applies. The core analytical workflow is outlined below.
Sample Preparation
Finished packaging is cleaned of foreign matter, cryogenically milled or cut to sub-millimeter particle size, and homogenized. For total-content analysis, aliquots are digested by closed-vessel microwave-assisted acid digestion or aqua regia digestion consistent with EN 13657. For migration work, samples are cut to defined surface-area-to-volume ratios and contacted with simulants in migration cells or by total immersion.
Elemental Analysis
ICP-OES (ISO 11885) and ICP-MS (ISO 17294-2) provide multi-element quantification at sub-mg/kg levels; mercury is determined by cold-vapor AAS or atomic fluorescence per ISO 12846; hexavalent chromium is measured by alkaline extraction followed by 1,5-diphenylcarbazide UV-Vis colorimetry. Handheld X-ray fluorescence (XRF) screening delivers rapid pass/fail indications for heavy metals at goods-receipt, with quantitative ICP confirmation of any flagged samples.
Chromatographic and Mass Spectrometric Techniques
GC-MS covers phthalates, photoinitiators, and semi-volatile organics; headspace GC-MS quantifies residual solvents released from films and printed surfaces; LC-MS/MS determines bisphenols, primary aromatic amines, and PFAS at low ppb levels. Formaldehyde in aqueous extracts of paper and board is measured by derivatization and HPLC or spectrophotometry consistent with EN 1541. MOSH and MOAH are separated and quantified by online LC-GC-FID or comprehensive two-dimensional GC-FID to resolve the complex hydrocarbon envelope against retention-index calibration.
Migration Testing
Overall migration is performed per the EN 1186 series using aqueous simulants (10% ethanol, 3% acetic acid), olive oil, and substitute simulants (50% and 95% ethanol, isooctane) under worst-case foreseeable time–temperature conditions, for example 10 days at 40 °C for long-term ambient storage or shorter high-temperature exposures for hot-fill and retort applications. Specific migration follows the EN 13130 series and validated laboratory procedures, with results normalized to mg/kg food or mg/dm² and compared against SMLs in EU 10/2011, GB 9685, and 21 CFR listings.
Sensory and Ancillary Evaluation
Odor and taste-transfer tests per EN 1230-1 and EN 1230-2 assess whether packaging imparts a detectable taint, a frequent cause of food and beverage rejection even when all chemical limits are met.
Applications
Hazardous substance test data on packaging supports regulatory compliance, product stewardship, and supply-chain quality programs across virtually every industry that ships physical goods:
- Food and beverage: compliance files for direct-contact and secondary packaging, migration dossiers, and NIAS risk assessments for new formats and recycled content.
- Pharmaceutical and medical: extractables and leachables support, elemental screening of container-closure systems, and compatibility documentation aligned with pharmacopeial expectations.
- Cosmetics and personal care: heavy-metal verification for decorated containers, closure liners, and pump components in prolonged contact with formulations.
- Electronics and consumer goods: packaging compliance for products sold in TPCH jurisdictions and documented restricted-substance control for e-commerce packaging.
- Export market access: coordinated test packages that satisfy EU, US, and Chinese requirements from a single sample submission, reducing duplicate testing.
- Sustainability claims: analytical substantiation of recycled-content statements through control of mineral oils, diisopropylnaphthalenes, and legacy additives in post-consumer recyclate.
FAQ
What is the heavy metal limit for packaging materials?
EU Directive 94/62/EC and the TPCH model legislation both cap the combined concentration of lead, cadmium, mercury, and hexavalent chromium at 100 mg/kg (ppm) in any packaging component, calculated as the sum of the four metals.
What is the difference between total content and migration testing?
Total-content analysis measures the amount of a substance present in the material itself, which is appropriate for packaging heavy-metal limits and SVHC screening. Migration testing measures the amount that transfers into food simulants under defined conditions and is compared against specific migration limits rather than content thresholds.
Which packaging requires food-contact migration testing?
Any material intended for direct food contact, including films, trays, bottles, cans, lids, seals, and printed inner surfaces, requires migration assessment under EU 10/2011, the GB 4806 and GB 31604 system, or equivalent national rules. Secondary packaging generally requires content-based testing plus a barrier justification where set-off risk exists.
Why are MOSH and MOAH important for paper packaging?
Mineral oils originate mainly from printing inks in recycled newsprint and can migrate from recycled board into dry foods. MOAH fractions are of toxicological concern as potential mutagens, so many brand owners impose contractual limits and require LC-GC-FID verification of food-contact board.
How much sample is needed and how long does testing take?
Typical requirements are 100–300 g of finished packaging per test family, or 50–100 g of inks, adhesives, or masterbatch. Routine heavy-metal and phthalate testing is commonly completed within 5–7 working days, while full migration programs and SVHC screening may require 2–3 weeks.
How often should packaging be retested?
Retesting is recommended whenever the formulation, supplier, ink system, or recycling stream changes, and periodically, typically annually, for ongoing supplier surveillance, since recycled-content variability is a major driver of batch-to-batch differences.