Hydrostatic Head Explained: How It Works in Performance Sportswear
Hydrostatic Head is best understood as water pressure a fabric withstands. This entry explains how it behaves inside a finished garment rather than only in the laboratory.
What the term means
water pressure a fabric withstands, which is why the value appears on almost every technical data sheet. Working figures for Hydrostatic Head normally sit around 1000-10000 mm depending on use in mainstream production. Note ISO 811 water penetration on the tech pack so nobody tests against an older revision.
Why it matters in practice
it rates waterproofness of coated and laminated fabric, so it influences buying decisions more than most buyers expect. Record elastane content alongside Hydrostatic Head, because blends shift the measured value. A result outside 1000-10000 mm depending on use usually points to process drift rather than to the fibre itself.
Typical values seen in activewear
1000-10000 mm depending on use. Ranges vary by construction, so compare like with like. Keeping reference values for Hydrostatic Head lets suppliers quote without extra sampling rounds. Ask for conditioning details together with ISO 811 water penetration, since both affect the reading.
How it is measured
ISO 811 water penetration is the reference normally quoted on a test report. Working figures for Hydrostatic Head normally sit around 1000-10000 mm depending on use in mainstream production. Note ISO 811 water penetration on the tech pack so nobody tests against an older revision.
Frequent mistakes
Comparing results from different standards, testing unwashed fabric, and writing the target without tolerance are the common errors. Record elastane content alongside Hydrostatic Head, because blends shift the measured value. A result outside 1000-10000 mm depending on use usually points to process drift rather than to the fibre itself.
