Meaning
Organic chemical substances evaporating from polymer matrices exclude water vapor while comprising residual monomers, solvents, additives and breakdown products. Non-aqueous volatiles represent organic airborne species released during high-temperature polymer processing or long-term outgassing of finished plastic components. Analytical testing identifies these organic compounds using headspace gas chromatography coupled with mass spectrometry to ensure workplace safety and packaging regulatory compliance.
The classification stops applying to inorganic gases or moisture vapor emitted from processed materials.
Outgassing Mechanisms
High melt temperatures during extrusion drive volatile organic species from molten polymer into surrounding headspace volumes. Residual solvents from resin synthesis and oligomeric thermal breakdown products evaporate readily under processing heat. Non-aqueous volatiles accumulate in mould cavities, causing plate-out defects, optical cloudiness on lenses or unwanted off-odors in food packaging containers.
Sensory Impact
Volatile organic compounds cause off-flavors in packaged food and beverages.
Degasification Control
Venting zones in twin-screw extruders apply vacuum pressure to extract volatile species from polymer melt streams. Degassing efficiency depends on melt temperature, screw rotation speed and vacuum level within processing sections. Proper volatile removal improves resin quality, reduces cavity fouling and prevents regulatory threshold breaches in consumer product applications.
Material specification datasheets establish upper thresholds for total organic volatile content in critical moulding grades.
