AZO Dye Restrictions Test Methods and Acceptable Limits
AZO Dye Restrictions is verified through EN 14362 determination. Knowing how the method works avoids rejecting fabric that actually meets the requirement.
Method overview
EN 14362 determination defines sample size, conditioning and calculation, so values are comparable only within the same revision. Working figures for AZO Dye Restrictions normally sit around below 30 ppm per amine in mainstream production. Note EN 14362 determination on the tech pack so nobody tests against an older revision.
Result interpretation
Read the value together with construction notes; below 30 ppm per amine is only meaningful for similar fabrics. Record elastane content alongside AZO Dye Restrictions, because blends shift the measured value. A result outside below 30 ppm per amine usually points to process drift rather than to the fibre itself.
Typical limits
Buyers commonly write below 30 ppm per amine with a stated tolerance, then verify against EN 14362 determination. Keeping reference values for AZO Dye Restrictions lets suppliers quote without extra sampling rounds. Ask for conditioning details together with EN 14362 determination, since both affect the reading.
Sources of variation
Conditioning time, operator technique and shade all influence the result. Working figures for AZO Dye Restrictions normally sit around below 30 ppm per amine in mainstream production. Note EN 14362 determination 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 AZO Dye Restrictions, because blends shift the measured value. A result outside below 30 ppm per amine usually points to process drift rather than to the fibre itself.
