Food Contact Material Testing: Ensuring PET & PP Packaging Safety

Food contact material (FCM) testing is the cornerstone of food packaging safety and a mandatory requirement for market access in every major global economy. For manufacturers, importers and food brands using PET and PP food containers, proper testing is not just a compliance formality — it is the primary mechanism for verifying that packaging will not transfer harmful substances into food under real-world conditions of use. Despite its importance, many packaging buyers have only a superficial understanding of what FCM testing involves, which tests are required and how to interpret test results. This article provides a practical overview of food contact material testing for PET and PP packaging, explaining the key test types, regulatory frameworks and best practices for ensuring product safety.

Food contact material testing is a set of laboratory procedures designed to measure whether and how much substance transfers from a packaging material into food under specified conditions of use. The core principle is that even food-grade materials can release trace amounts of their constituent substances — monomers, additives, oligomers or processing aids — and these transfers must remain below legally defined safety limits. Testing simulates the actual conditions under which the packaging will be used, including food type, contact time and temperature, to produce results that reflect real-world safety. For PET and PP containers, testing is particularly important because these materials are used across a wide range of temperatures and food types, from cold salads to hot microwaveable meals.

There are two primary categories of food contact migration testing that apply to PET and PP packaging: overall migration testing and specific migration testing.

Overall migration (OM) testing measures the total amount of all non-volatile substances that transfer from the material into a food simulant. It provides a broad measure of the material’s inertness and is the most fundamental FCM test. The standard limit for overall migration is 10 mg per dm² of contact surface (or 60 mg per kg of food) under EU regulations, and equivalent extractive limits apply under FDA regulations. Testing uses standard food simulants that represent different food categories: distilled water or 3% acetic acid for aqueous and acidic foods, 10% or 20% ethanol for alcoholic foods, and vegetable oil or olive oil simulant for fatty foods. The choice of simulant depends on the intended food application of the packaging.

Specific migration (SM) testing measures the transfer of individual, identified substances from the material into food simulants. Each substance with a specific migration limit — such as terephthalic acid and ethylene glycol for PET, or antioxidants and slip agents for PP — must be tested individually to ensure its migration remains below the legal limit. Specific migration testing is more targeted and analytical than overall migration, typically using techniques like gas chromatography (GC) or high-performance liquid chromatography (HPLC) to identify and quantify individual compounds. For PET packaging, testing for antimony (a catalyst used in PET production) is also commonly required, as antimony has a specific migration limit under both EU and FDA regulations.

In addition to migration testing, several other types of testing are commonly required for PET and PP food contact packaging. Sensory testing evaluates whether the material imparts any off-taste, off-odor or discoloration to food, which is important for preserving food quality. Heavy metal testing screens for lead, cadmium, mercury and other toxic metals that may be present as impurities. Volatile organic compound (VOC) testing measures residual solvents and volatile substances, particularly relevant for printed packaging. For microwave-safe PP containers, additional high-temperature migration testing is conducted at microwave-relevant temperatures to verify safety under heating conditions. For recycled content packaging, additional purity and contamination testing is required to ensure food-contact grade quality.

The regulatory framework for FCM testing varies by market, and understanding these differences is essential for exporters. In the European Union, testing must comply with Regulation (EU) No 10/2011, with test methods standardized under EN 1186 series for overall migration and EN 13130 series for specific migration. In the United States, testing follows FDA 21 CFR requirements, with extractive testing conducted according to FDA food contact protocols. In Germany, the LFGB (Food and Feed Code) imposes additional requirements beyond the EU baseline. In China, GB 4806 series standards govern food contact plastic testing. Each market may require different test conditions, simulants or documentation formats, so it is critical to match testing to the specific destination market.

A common mistake among packaging buyers is assuming that a single test report covers all use conditions. In reality, test results are only valid for the specific conditions under which the testing was conducted. A PET container tested for cold food contact at 5°C for 24 hours cannot be assumed safe for hot food use, because higher temperatures significantly increase migration rates. Similarly, a container tested with aqueous food simulants may not be validated for fatty or acidic foods. When sourcing packaging, always confirm that the test conditions — temperature, time and food simulant — match your actual product use conditions. For products used across multiple conditions, separate testing for each relevant condition may be required.

Another important consideration is the validity and credibility of test reports. Testing should be conducted by laboratories that are accredited to ISO 17025, the international standard for testing and calibration laboratory competence. Reports from non-accredited laboratories or in-house manufacturer tests may not be accepted by regulatory authorities or major retail customers. Test reports should clearly state the test method, food simulant used, contact conditions, measured values and applicable legal limits, with a clear pass/fail conclusion. Always request the full original test report, not just a summary or certificate.

For manufacturers and importers, implementing a robust FCM testing program involves several best practices. First, test every new product design and every new material formulation before market launch. Second, conduct periodic re-testing of ongoing products to ensure consistent compliance, especially when changing resin suppliers or production parameters. Third, maintain complete test documentation for every product, as regulatory authorities and retail customers may request these records at any time. Fourth, work with manufacturers that have in-house quality control testing alongside third-party accredited testing, as this provides an additional layer of safety assurance. Fifth, for products with recycled content, require additional testing to verify that purification processes have removed contaminants effectively.

In conclusion, food contact material testing is the essential verification step that ensures PET and PP packaging is safe for its intended use. By understanding the types of tests required, matching test conditions to actual use, working with accredited laboratories and maintaining complete documentation, manufacturers and importers can ensure compliance, reduce risk and protect both consumer health and brand reputation.

As a professional food packaging manufacturer, we conduct comprehensive food contact material testing for all our PET and PP products through ISO 17025 accredited laboratories, with full test documentation available for every market we serve. Our quality team can help you verify that packaging meets the specific testing requirements of your target markets.