Hydrostatic Head Pressure Testing
topic
Hydrostatic head testing supports a fabric specimen horizontally and applies increasing water pressure to the underside at a standardised rate, recording the pressure at which three water drops appear on the upper surface; results are expressed in millimetres of water column and reflect pore size, coating integrity, and seam performance.
Role
Primary waterproofing standard for outdoor technical fabrics, military textiles, and geotextiles, providing a reproducible pressure threshold that defines the boundary between shower-resistant and fully waterproof material classifications.
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