Two-Way Stretch How It Changes with Construction and Elastane Content
Two-Way Stretch does not stay constant when construction changes. Understanding the direction of change helps during development.
Effect of knit structure
Loop length and density move results first, usually before any yarn change is made. Working figures for Two-Way Stretch normally sit around 20-40% typical in mainstream production. Note ASTM D6614 stretch woven test on the tech pack so nobody tests against an older revision.
Effect of elastane content
More elastane raises recovery but changes the value measured by ASTM D6614 stretch woven test, so retest after any blending change. Record elastane content alongside Two-Way Stretch, because blends shift the measured value. A result outside 20-40% typical usually points to process drift rather than to the fibre itself.
Effect of finishing
Heat setting and softeners shift results, which explains differences between a hand sample and bulk. Keeping reference values for Two-Way Stretch lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ASTM D6614 stretch woven test, since both affect the reading.
Typical range
Working values stay around 20-40% typical for mainstream activewear. Working figures for Two-Way Stretch normally sit around 20-40% typical in mainstream production. Note ASTM D6614 stretch woven test on the tech pack so nobody tests against an older revision.
Development advice
Change one variable at a time, then verify against ASTM D6614 stretch woven test before moving to the next sample round. Record elastane content alongside Two-Way Stretch, because blends shift the measured value. A result outside 20-40% typical usually points to process drift rather than to the fibre itself.
