Meaning
Unintended chemical compounds present in polymer matrices possess boiling points between atmospheric volatile organic compounds and non-volatile plasticizers. Semi-volatile non-intentionally added substances comprise degradation products, side-reaction intermediates, additive impurities and environmental contaminants present in packaging materials. Testing laboratories analyze these compounds using solvent extraction and gas chromatography-mass spectrometry to evaluate chemical migration risks in food packaging materials.
The classification stops applying to low-boiling volatile solvents or high molecular weight polymer additives.
Migration Behavior
Intermediate molecular weight enables these compounds to diffuse slowly through polymer structures and migrate into contact media over time. Thermal degradation during recycling generates oligomeric breakdown products and oxidation residues that fall into this chemical category. Semi-volatile non-intentionally added substances cause regulatory compliance failures when cumulative migration levels exceed toxicity thresholds in packaging applications.
Screening Analysis
Gas chromatography coupled with mass spectrometry identifies unknown migrant compounds.
Risk Assessment
Toxicological evaluation determines safe threshold values for identified non-target chemical migrants. Post-consumer recycling processes require intensive decontamination steps to volatilize and extract semi-volatile compounds from polymer flakes. Material suppliers conduct non-target screening to verify that recycled resin grades do not transfer harmful chemical impurities into packaged consumer goods.
Establishing comprehensive migrant profiles ensures compliance with international packaging safety standards.
