Colour Fastness to Perspiration How It Changes with Construction and Elastane Content
Colour Fastness to Perspiration 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 Colour Fastness to Perspiration normally sit around grade 4 minimum in mainstream production. Note ISO 105-E04 perspiration 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 105-E04 perspiration, so retest after any blending change. Record elastane content alongside Colour Fastness to Perspiration, because blends shift the measured value. A result outside grade 4 minimum 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 Colour Fastness to Perspiration lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 105-E04 perspiration, since both affect the reading.
Typical range
Working values stay around grade 4 minimum for mainstream activewear. Working figures for Colour Fastness to Perspiration normally sit around grade 4 minimum in mainstream production. Note ISO 105-E04 perspiration on the tech pack so nobody tests against an older revision.
Development advice
Change one variable at a time, then verify against ISO 105-E04 perspiration before moving to the next sample round. Record elastane content alongside Colour Fastness to Perspiration, because blends shift the measured value. A result outside grade 4 minimum usually points to process drift rather than to the fibre itself.
