Cross Border Polymer Migration Testing Standard Parameters
Cross-border polymer migration compliance requires testing finished articles under verified worst-case simulants, contact times, and surface-to-volume ratios.
Substitute Fatty Extractants
Meaning
Alternative testing solvents used in laboratory analysis mimic the behavior of fatty foods without the practical difficulties of working with real oils. In migration testing for polymers, substitute fatty extractants are used to replace olive oil, which is difficult to extract and analyze. Common substitute solvents include isooctane and 95 percent ethanol, which penetrate polymers in a similar manner but are much easier to evaporate.
This substitution simplifies the testing process and reduces the time required to complete compliance checks.
Extraction Efficiency
These organic solvents have low boiling points, which allows them to be easily removed after the extraction period. This leaves behind only the migrated polymer additives, which can then be weighed or analyzed. This is much more accurate than measuring weight changes in real oils.
Regulatory Status
The use of substitute solvents is permitted by many food safety authorities, provided that the test conditions are adjusted to match the severity of oil exposure. For example, testing with isooctane for two days at twenty degrees Celsius can simulate ten days at forty degrees in oil. This accelerated testing is crucial for rapid quality control.
Process Selection
Solvent selection depends on the polymer being tested, as some solvents can dissolve or swell certain plastics. Isooctane can cause significant swelling in polyolefins, which must be accounted for in the test results. Choosing the correct solvent ensures a reliable safety evaluation.