Hydrostatic Head Why Shipments Get Rejected Over This
Many disputes come down to Hydrostatic Head. Below is what inspectors check and why shipments fail.
The core definition
water pressure a fabric withstands. 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.
Most common cause of failure
Results usually fall outside 1000-10000 mm depending on use because the target was never written into the order. 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.
How it is checked
Inspection and laboratory work both refer to ISO 811 water penetration. 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.
Related faults
it rates waterproofness of coated and laminated fabric, so related complaints often point back to this single parameter. 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.
Avoiding rejection
Agree targets, tolerances and the method before production, then test per lot rather than per shipment. 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.
