APEO and NPEO Limits Setting It Correctly on a Tech Pack
APEO and NPEO Limits should be written into the tech pack with a value, a tolerance and a method. This removes ambiguity from quotations.
Definition to agree
restrictions on nonylphenol ethoxylates. 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.
Target value
Open the specification at usually below 100 ppm, adjusted to the end use. 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.
Method line
Always pair the target with extraction then LC-MS test so the mill and the laboratory test the same way. 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.
Tolerance line
State plus or minus limits to keep production realistic while protecting the requirement. 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.
Approval step
Approve the result on pre-production bulk rather than on development fabric only. 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.
