Four-Way Stretch Test Methods and Acceptable Limits
Four-Way Stretch is verified through ISO 13934-1 cyclic extension. Knowing how the method works avoids rejecting fabric that actually meets the requirement.
Method overview
ISO 13934-1 cyclic extension defines sample size, conditioning and calculation, so values are comparable only within the same revision. Working figures for Four-Way Stretch normally sit around 30-60% typical extension in mainstream production. Note ISO 13934-1 cyclic extension on the tech pack so nobody tests against an older revision.
Result interpretation
Read the value together with construction notes; 30-60% typical extension is only meaningful for similar fabrics. Record elastane content alongside Four-Way Stretch, because blends shift the measured value. A result outside 30-60% typical extension usually points to process drift rather than to the fibre itself.
Typical limits
Buyers commonly write 30-60% typical extension with a stated tolerance, then verify against ISO 13934-1 cyclic extension. Keeping reference values for Four-Way Stretch lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 13934-1 cyclic extension, since both affect the reading.
Sources of variation
Conditioning time, operator technique and shade all influence the result. Working figures for Four-Way Stretch normally sit around 30-60% typical extension in mainstream production. Note ISO 13934-1 cyclic extension 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 Four-Way Stretch, because blends shift the measured value. A result outside 30-60% typical extension usually points to process drift rather than to the fibre itself.
