Quantification of Non-Intentionally Added Substances in Food Packaging
Non-intentionally added substance quantification requires high-resolution mass spectrometry screening paired with toxicological threshold evaluation for safe compliance.
Octadecyl 3 3 5 Di Tert Butyl 4 Hydroxyphenyl Propionate
Meaning
Sterically hindered phenolic antioxidants act as primary stabilizers to protect polymers against thermo-oxidative degradation during processing and long-term use. In resin compounding, octadecyl 3 3 5 di tert butyl 4 hydroxyphenyl propionate prevents the formation of free radicals that initiate chain scission in polyolefins. The additive maintains the mechanical properties and molecular weight of the plastic during high-temperature extrusion and moulding.
Chemical Mechanism
Protection of the polymer chain occurs through the donation of a hydrogen atom from the phenolic hydroxyl group to a propagating alkoxy or peroxy radical. This reaction terminates the auto-oxidation loop, preventing the breakdown of the polymer backbone. Since octadecyl 3 3 5 di tert butyl 4 hydroxyphenyl propionate is highly resistant to extraction and has low volatility, it remains within the plastic matrix during hot melt processing.
This stability is particularly important for thin films and extruded sheets where high surface-to-volume ratios accelerate additive loss. Molders benefit from the thermal stabilization because it allows them to recycle sprues and runners as regrind without risking immediate loss of tensile strength.
Sourcing Strategy
Material specifiers choose this stabilizer because of its compatibility with a wide range of thermoplastic resins. Its inclusion on global food contact registries makes it standard in food-grade polyethylene and polypropylene formulations.
Degradation Defect
Insufficient stabilizer levels cause the polymer to degrade during the molding cycle, resulting in discolored parts and reduced impact resistance. This chemical degradation can lead to premature failure of the finished component under load.