Squat-Proof Opacity Test Methods and Acceptable Limits
Squat-Proof Opacity is verified through AATCC 183 transmission with photography. Knowing how the method works avoids rejecting fabric that actually meets the requirement.
Method overview
AATCC 183 transmission with photography defines sample size, conditioning and calculation, so values are comparable only within the same revision. Working figures for Squat-Proof Opacity normally sit around above 96% opacity in mainstream production. Note AATCC 183 transmission with photography on the tech pack so nobody tests against an older revision.
Result interpretation
Read the value together with construction notes; above 96% opacity is only meaningful for similar fabrics. Record elastane content alongside Squat-Proof Opacity, because blends shift the measured value. A result outside above 96% opacity usually points to process drift rather than to the fibre itself.
Typical limits
Buyers commonly write above 96% opacity with a stated tolerance, then verify against AATCC 183 transmission with photography. Keeping reference values for Squat-Proof Opacity lets suppliers quote without extra sampling rounds. Ask for conditioning details together with AATCC 183 transmission with photography, since both affect the reading.
Sources of variation
Conditioning time, operator technique and shade all influence the result. Working figures for Squat-Proof Opacity normally sit around above 96% opacity in mainstream production. Note AATCC 183 transmission with photography 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 Squat-Proof Opacity, because blends shift the measured value. A result outside above 96% opacity usually points to process drift rather than to the fibre itself.
