Toxicological Threshold Risk Scoring for Non-Intentionally Added Substances in Recycled Polymers
Toxicological threshold scoring maps unidentified polymer migrates to Cramer exposure limits, mandating genotoxic screening below 0.00015 mg/kg food.
Deoxypolyethylene
Meaning
Specialized grade of resin engineered to contain minimal oxidative precursors and oxygen-containing functional groups. Deoxypolyethylene is processed under inert conditions to ensure that the polymer chains remain as close to a pure hydrocarbon state as possible. The material is used primarily in high-purity applications where off-gassing or oxidative degradation would compromise the performance of the part.
Oxygen Management
Production of this material involves stripping dissolved gases from the melt during the final stages of polymerisation. Deoxypolyethylene prevents the formation of aldehydes and ketones that cause unwanted odors in bottled water or pharmaceutical containers. By removing the sites where oxygen can react, the resin stays stable during multiple heat cycles.
Barrier Extension
Compatibility with oxygen-sensitive contents is improved when the base resin does not contribute to the oxidation process. Deoxypolyethylene acts as an ideal carrier for active scavenging additives because it does not consume the scavenger itself through side reactions. This synergy extends the shelf life of the final package without requiring a thicker wall.
Mechanical Integrity
Strength of the moulded part is maintained over time because the lack of internal oxygen sites inhibits the initiation of chain scission. Deoxypolyethylene shows superior resistance to stress cracking compared to standard grades when exposed to harsh environments. This durability makes it a preferred choice for long-term storage of chemical reagents.
The resin remains the gold standard for applications requiring the highest level of sensory neutrality.