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