pH Value of Fabric Frequently Asked Questions
Short answers to the questions buyers ask most often about pH Value of Fabric.
What does it mean?
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.
What value should be specified?
Start from 4.0 to 7.5 for skin contact and adjust for the end use of the garment. 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.
How is it tested?
ISO 3071 aqueous extract. 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.
Why does it change between lots?
Process variables such as finishing temperature and elastane batch cause the normal spread of results. 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.
Can results be compared across suppliers?
Only when the same standard revision and conditioning are used; otherwise measurements are not equivalent. 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.
