In the production process of rubber, plastic and other products, in order to prolong the service life of the product and have good anti-oxidation, smoothness, flexibility and other properties, antioxidants, anti-blocking agents, plasticizers and other additives are often mixed. In addition to this, it is difficult to completely react the individual monomers used to prepare the product. Experiments have shown that these additives and residual monomers will slowly migrate outward in rubber, plastic and other products. When rubber and plastic products are in direct contact with food and medicine in packaging or other forms, these substances are likely to migrate. In food and medicine, food safety incidents such as "liquor plasticizer incident" and "toxic plastic wrap incident" are all related to the migration of harmful substances in packaging. Monitoring of Migratory Substances in Articles. Pacifiers are mostly used by infants and are in direct contact with the milk powder and oral cavity. The functional development of various organs of infants is not perfect. There are more migratory substances in the pacifier, which is more harmful to the baby. The total amount of control to ensure the safety of infant food intake. Each country has national standards, such as Thailand

Thailand mandates TIS 1025-2562 (2019) as a new standard for pacifiers. This will take effect on December 13, 2021.

Volatile compound content

Test methods and instruments

The AUTO ZF3600 total migration and non-volatile matter analyzer has an integrated system design of water bath evaporation, heating and drying, drying and cooling, and constant temperature weighing. The test process is fully automated without manual participation. It is suitable for testing the total migration (non-volatile matter, evaporation residue) and other items in the fields of purified water, pharmaceutical packaging materials, food packaging, cigarette tipping paper and chemical reagents. It can also be applied to the water content, loss on drying and other items of solid samples, and the total dissolved solid content test in water quality testing.

Test principle
Put the solution to be tested into the solvent storage dish of the automatic feeding system, and the empty cup is heated, cooled and weighed at the set temperature. Repeat the steps until a constant weight value is reached. Evaporate to dryness on a water bath below the boiling point of the soaking liquid. The cavity is heated to 105°C, dried and cooled. After the evaporating dish is cooled, the constant weight is judged with a balance (sensitivity is 0.01 mg), and the experiment is terminated to meet the constant weight requirement of the project.

Test samples and test procedures

Test sample: baby pacifier
Experimental procedure:
1. Migration process:
(1) Different soaking solutions are selected, and the total amount of substances migrated is different. The pacifier is in contact with water-based, non-acidic food with an ethanol content of less than 8%, so the soaking liquid selected in this test is distilled water.
(2) Add distilled water at 40°C to the sample to be tested, and place the sample to be tested containing distilled water in an environment of 40°C for 24 hours, and do a blank test at the same time.
2. Weighing process:
(1) Take the soaking solution and blank reagent and put them in an evaporating dish with constant weight and evaporate to dryness.
(2) Transfer the evaporating dish to the corresponding numbered tray rack in the evaporative residue constant weight meter, set parameters such as drying time and drying temperature, and click the test option to start the test.
(3) After the test, the device will automatically display the test results.

Test Results and Analysis

The total migration in the nipple samples tested in this test was 2.9 mg/kg.

The total migration of migratory substances in rubber and plastic products that are in direct contact with food and medicine is one of the important properties that affects the safety of their use. Strictly controlling and strengthening the monitoring of the total migration will improve product quality and prevent pollution. Food and medicine are of great significance. GBPI's Evaporation Residue Constant Weight Meter has the advantages of accurate testing, high intelligence and convenient use in detecting total migration. GBPI is a high-tech enterprise specializing in the research and development, production and packaging testing services of packaging testing equipment. The existing testing equipment includes gas transmission rate tester, oxygen transmission rate tester, water vapor transmission rate tester, intelligent Electronic tensile testing machine, friction coefficient tester, heat shrink tester, sealing tester, heat sealing tester, headspace gas analyzer and other testing instruments  of packaging.