APEO and NPEO Limits Test Methods and Acceptable Limits
APEO and NPEO Limits is verified through extraction then LC-MS test. Knowing how the method works avoids rejecting fabric that actually meets the requirement.
Method overview
extraction then LC-MS test defines sample size, conditioning and calculation, so values are comparable only within the same revision. Working figures for APEO and NPEO Limits normally sit around usually below 100 ppm in mainstream production. Note extraction then LC-MS test on the tech pack so nobody tests against an older revision.
Result interpretation
Read the value together with construction notes; usually below 100 ppm is only meaningful for similar fabrics. Record elastane content alongside APEO and NPEO Limits, because blends shift the measured value. A result outside usually below 100 ppm usually points to process drift rather than to the fibre itself.
Typical limits
Buyers commonly write usually below 100 ppm with a stated tolerance, then verify against extraction then LC-MS test. Keeping reference values for APEO and NPEO Limits lets suppliers quote without extra sampling rounds. Ask for conditioning details together with extraction then LC-MS test, since both affect the reading.
Sources of variation
Conditioning time, operator technique and shade all influence the result. Working figures for APEO and NPEO Limits normally sit around usually below 100 ppm in mainstream production. Note extraction then LC-MS test on the tech pack so nobody tests against an older revision.
Documentation
Record the standard revision on every report, because older versions can differ from current practice. Record elastane content alongside APEO and NPEO Limits, because blends shift the measured value. A result outside usually below 100 ppm usually points to process drift rather than to the fibre itself.
