Regular projects
Sensory requirements: Use visual, olfactory, gustatory and other sensory methods to check whether the material has any odor, discoloration, foreign matter, etc., as well as whether the soaking solution has sedimentation, turbidity and other phenomena, to ensure that the material will not have adverse effects on the odor, color and other aspects of the food.
Total migration amount: Simulating food contact materials in actual use, soaking them in specific food simulants, and then measuring the total amount of non-volatile substances that migrate from the material to the simulant to evaluate the amount of chemical substances that the material may release into the food.
Potassium permanganate consumption: used to detect the content of organic substances in food contact materials that can be oxidized by potassium permanganate, which may migrate into food and pose potential hazards to human health. Usually, materials are soaked in a certain concentration of potassium permanganate solution, and then the consumption of potassium permanganate in the soaking solution is measured.
Heavy metals (calculated as Pb): Detect the content of lead in materials. Lead is a toxic heavy metal that may migrate to food when in contact with it, causing damage to the human nervous system, blood system, etc. In addition, it may also detect the migration of other heavy metals such as cadmium, chromium, nickel, arsenic, antimony, zinc, etc., which also have certain toxicity.
Specific migration projects: In addition to heavy metals, it is also necessary to detect the migration amount of certain organic substances, such as formaldehyde, phenols, aromatic amines, vinyl chloride, and vinylidene chloride. These substances may come from additives, monomers, or other components in the material, and have potential carcinogenic, teratogenic, and other hazards.
Microbiological
Coliform bacteria: a group of aerobic and facultative anaerobic Gram negative non spore forming bacteria that can ferment lactose to produce acid and gas within 37 ℃ and 24 hours. Detecting coliform bacteria can reflect the degree of fecal contamination of materials and indirectly evaluate their hygiene condition.
Pathogenic bacteria: including Shigella, Salmonella, Staphylococcus aureus, Streptococcus pyogenes, etc. Once these bacteria enter food through food contact materials, they may cause serious food poisoning or other diseases, posing great harm to human health.
Mold: Mold growth on food contact materials may produce toxins and affect the performance and appearance of the materials. Detecting mold can evaluate the hygiene quality of materials during storage and use.
Others
Fluorescent substances: Detect whether materials contain fluorescent whitening agents and other fluorescent substances, which may migrate into food and pose potential hazards to human health, as well as affect the appearance and quality of food.
Decolorization test: mainly for colored food contact materials, by soaking the material in a specific solvent and observing whether there is a color change in the solvent, it can be determined whether the pigments in the material will migrate to the food, avoiding contamination of the food by the pigments.
Dry weight loss: measures the weight loss of a material after drying at a certain temperature, mainly reflecting the content of moisture and volatile substances in the material. Excessive dry weight loss may affect the performance and safety of the material.
Burning residue: After burning the material at high temperature, measuring the weight of the remaining residue can reflect the content of inorganic impurities in the material. Excessive impurity content may affect food quality.


The testing items and standards for food contact materials may vary in different countries and regions. For example, China mainly conducts testing based on national standards such as GB 4806 series standards and GB 9685; Food contact materials in the United States must comply with FDA regulations, and different materials have different immersion testing requirements; The European Union has regulations and directives such as (EC) No 1935/2004, which set requirements for the safety of raw materials and limits on transferable substances.