pH Value of Fabric Setting It Correctly on a Tech Pack
pH Value of Fabric should be written into the tech pack with a value, a tolerance and a method. This removes ambiguity from quotations.
Definition to agree
acidity or alkalinity of extractable liquid. Working figures for pH Value of Fabric normally sit around 4.0 to 7.5 for skin contact in mainstream production. Note ISO 3071 aqueous extract on the tech pack so nobody tests against an older revision.
Target value
Open the specification at 4.0 to 7.5 for skin contact, adjusted to the end use. Record elastane content alongside pH Value of Fabric, because blends shift the measured value. A result outside 4.0 to 7.5 for skin contact usually points to process drift rather than to the fibre itself.
Method line
Always pair the target with ISO 3071 aqueous extract so the mill and the laboratory test the same way. Keeping reference values for pH Value of Fabric lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 3071 aqueous extract, since both affect the reading.
Tolerance line
State plus or minus limits to keep production realistic while protecting the requirement. Working figures for pH Value of Fabric normally sit around 4.0 to 7.5 for skin contact in mainstream production. Note ISO 3071 aqueous extract 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 pH Value of Fabric, because blends shift the measured value. A result outside 4.0 to 7.5 for skin contact usually points to process drift rather than to the fibre itself.
