Acid Dyeing Test Methods and Acceptable Limits
Acid Dyeing is verified through jet dyeing with levelling agents. Knowing how the method works avoids rejecting fabric that actually meets the requirement.
Method overview
jet dyeing with levelling agents defines sample size, conditioning and calculation, so values are comparable only within the same revision. Working figures for Acid Dyeing normally sit around 95-100 degrees with pH control in mainstream production. Note jet dyeing with levelling agents on the tech pack so nobody tests against an older revision.
Result interpretation
Read the value together with construction notes; 95-100 degrees with pH control is only meaningful for similar fabrics. Record elastane content alongside Acid Dyeing, because blends shift the measured value. A result outside 95-100 degrees with pH control usually points to process drift rather than to the fibre itself.
Typical limits
Buyers commonly write 95-100 degrees with pH control with a stated tolerance, then verify against jet dyeing with levelling agents. Keeping reference values for Acid Dyeing lets suppliers quote without extra sampling rounds. Ask for conditioning details together with jet dyeing with levelling agents, since both affect the reading.
Sources of variation
Conditioning time, operator technique and shade all influence the result. Working figures for Acid Dyeing normally sit around 95-100 degrees with pH control in mainstream production. Note jet dyeing with levelling agents 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 Acid Dyeing, because blends shift the measured value. A result outside 95-100 degrees with pH control usually points to process drift rather than to the fibre itself.
