Wales per Inch (WPI) Specification Targets for Buyers
Setting Wales per Inch (WPI) correctly on a tech pack prevents most later disputes. Targets belong on the page before the first fabric sample.
Where to write it
Place Wales per Inch (WPI) next to composition and weight so all three are quoted as one package. Working figures for Wales per Inch (WPI) normally sit around 20-40 depending on gauge in mainstream production. Note knitting machine setting on the tech pack so nobody tests against an older revision.
Reference level
Typical activewear expectation: 20-40 depending on gauge. Record elastane content alongside Wales per Inch (WPI), because blends shift the measured value. A result outside 20-40 depending on gauge usually points to process drift rather than to the fibre itself.
Tolerances that work
Allow a small tolerance rather than a fixed number, since normal process variation exists in every lot. Keeping reference values for Wales per Inch (WPI) lets suppliers quote without extra sampling rounds. Ask for conditioning details together with knitting machine setting, since both affect the reading.
Verification method
Confirm with knitting machine setting and keep the report against the bulk record. Working figures for Wales per Inch (WPI) normally sit around 20-40 depending on gauge in mainstream production. Note knitting machine setting on the tech pack so nobody tests against an older revision.
Commercial note
Tightening beyond practical need raises cost without improving garment life, so set the tightest target only where it protects the customer. Record elastane content alongside Wales per Inch (WPI), because blends shift the measured value. A result outside 20-40 depending on gauge usually points to process drift rather than to the fibre itself.
