Colour Fastness to Light Why Shipments Get Rejected Over This
Many disputes come down to Colour Fastness to Light. Below is what inspectors check and why shipments fail.
The core definition
resistance to fading under light. Working figures for Colour Fastness to Light normally sit around grade 4-6 by end use in mainstream production. Note ISO 105-B02 xenon arc on the tech pack so nobody tests against an older revision.
Most common cause of failure
Results usually fall outside grade 4-6 by end use because the target was never written into the order. Record elastane content alongside Colour Fastness to Light, because blends shift the measured value. A result outside grade 4-6 by end use usually points to process drift rather than to the fibre itself.
How it is checked
Inspection and laboratory work both refer to ISO 105-B02 xenon arc. Keeping reference values for Colour Fastness to Light lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 105-B02 xenon arc, since both affect the reading.
Related faults
it matters for outdoor and swim ranges, so related complaints often point back to this single parameter. Working figures for Colour Fastness to Light normally sit around grade 4-6 by end use in mainstream production. Note ISO 105-B02 xenon arc on the tech pack so nobody tests against an older revision.
Avoiding rejection
Agree targets, tolerances and the method before production, then test per lot rather than per shipment. Record elastane content alongside Colour Fastness to Light, because blends shift the measured value. A result outside grade 4-6 by end use usually points to process drift rather than to the fibre itself.
