Denier (D) Setting It Correctly on a Tech Pack
Denier (D) should be written into the tech pack with a value, a tolerance and a method. This removes ambiguity from quotations.
Definition to agree
weight in grams of 9000 metres of filament yarn. Working figures for Denier (D) normally sit around 20-150 denier in activewear in mainstream production. Note ASTM D1907 yarn number on the tech pack so nobody tests against an older revision.
Target value
Open the specification at 20-150 denier in activewear, adjusted to the end use. Record elastane content alongside Denier (D), because blends shift the measured value. A result outside 20-150 denier in activewear usually points to process drift rather than to the fibre itself.
Method line
Always pair the target with ASTM D1907 yarn number so the mill and the laboratory test the same way. Keeping reference values for Denier (D) lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ASTM D1907 yarn number, since both affect the reading.
Tolerance line
State plus or minus limits to keep production realistic while protecting the requirement. Working figures for Denier (D) normally sit around 20-150 denier in activewear in mainstream production. Note ASTM D1907 yarn number 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 Denier (D), because blends shift the measured value. A result outside 20-150 denier in activewear usually points to process drift rather than to the fibre itself.
