Reflective Print Test Methods and Acceptable Limits
Reflective Print is verified through EN ISO 20471 retroreflection. Knowing how the method works avoids rejecting fabric that actually meets the requirement.
Method overview
EN ISO 20471 retroreflection defines sample size, conditioning and calculation, so values are comparable only within the same revision. Working figures for Reflective Print normally sit around above 100 cd/lx/m2 retroreflection in mainstream production. Note EN ISO 20471 retroreflection on the tech pack so nobody tests against an older revision.
Result interpretation
Read the value together with construction notes; above 100 cd/lx/m2 retroreflection is only meaningful for similar fabrics. Record elastane content alongside Reflective Print, because blends shift the measured value. A result outside above 100 cd/lx/m2 retroreflection usually points to process drift rather than to the fibre itself.
Typical limits
Buyers commonly write above 100 cd/lx/m2 retroreflection with a stated tolerance, then verify against EN ISO 20471 retroreflection. Keeping reference values for Reflective Print lets suppliers quote without extra sampling rounds. Ask for conditioning details together with EN ISO 20471 retroreflection, since both affect the reading.
Sources of variation
Conditioning time, operator technique and shade all influence the result. Working figures for Reflective Print normally sit around above 100 cd/lx/m2 retroreflection in mainstream production. Note EN ISO 20471 retroreflection 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 Reflective Print, because blends shift the measured value. A result outside above 100 cd/lx/m2 retroreflection usually points to process drift rather than to the fibre itself.
