Reactive Dyeing Test Methods and Acceptable Limits
Reactive Dyeing is verified through exhaust or pad processes. Knowing how the method works avoids rejecting fabric that actually meets the requirement.
Method overview
exhaust or pad processes defines sample size, conditioning and calculation, so values are comparable only within the same revision. Working figures for Reactive Dyeing normally sit around 60-80 degrees with salt and alkali in mainstream production. Note exhaust or pad processes on the tech pack so nobody tests against an older revision.
Result interpretation
Read the value together with construction notes; 60-80 degrees with salt and alkali is only meaningful for similar fabrics. Record elastane content alongside Reactive Dyeing, because blends shift the measured value. A result outside 60-80 degrees with salt and alkali usually points to process drift rather than to the fibre itself.
Typical limits
Buyers commonly write 60-80 degrees with salt and alkali with a stated tolerance, then verify against exhaust or pad processes. Keeping reference values for Reactive Dyeing lets suppliers quote without extra sampling rounds. Ask for conditioning details together with exhaust or pad processes, since both affect the reading.
Sources of variation
Conditioning time, operator technique and shade all influence the result. Working figures for Reactive Dyeing normally sit around 60-80 degrees with salt and alkali in mainstream production. Note exhaust or pad processes 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 Reactive Dyeing, because blends shift the measured value. A result outside 60-80 degrees with salt and alkali usually points to process drift rather than to the fibre itself.
