Colour Fastness to Perspiration Setting It Correctly on a Tech Pack
Colour Fastness to Perspiration should be written into the tech pack with a value, a tolerance and a method. This removes ambiguity from quotations.
Definition to agree
colour stability against acidic and alkaline sweat. 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.
Target value
Open the specification at grade 4 minimum, adjusted to the end use. 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.
Method line
Always pair the target with ISO 105-E04 perspiration so the mill and the laboratory test the same way. 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.
Tolerance line
State plus or minus limits to keep production realistic while protecting the requirement. 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.
Approval step
Approve the result on pre-production bulk rather than on development fabric only. 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.
