Tensile Strength How It Changes with Construction and Elastane Content
Tensile Strength 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 Tensile Strength normally sit around above 150 N for most knits in mainstream production. Note ISO 13934-1 strip 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 ISO 13934-1 strip test, so retest after any blending change. Record elastane content alongside Tensile Strength, because blends shift the measured value. A result outside above 150 N for most knits 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 Tensile Strength lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 13934-1 strip test, since both affect the reading.
Typical range
Working values stay around above 150 N for most knits for mainstream activewear. Working figures for Tensile Strength normally sit around above 150 N for most knits in mainstream production. Note ISO 13934-1 strip test on the tech pack so nobody tests against an older revision.
Development advice
Change one variable at a time, then verify against ISO 13934-1 strip test before moving to the next sample round. Record elastane content alongside Tensile Strength, because blends shift the measured value. A result outside above 150 N for most knits usually points to process drift rather than to the fibre itself.
