A Brief Introduction to Hydrostatic Head / Pressure Test

 

In recent years, with the popularity of outdoor activities, consumers’ demand for textiles with waterproof and splash proof properties has greatly increased. The hydrostatic pressure resistance index is one of the important indicators for waterproof and breathable fabrics.

What is Hydrostatic Pressure Test?

Hydrostatic Pressure Test is to determine the resistance property to water penetration of fabric and material such as canvas, tarpaulin, manta, tent cloth, rain-proof garments.
During testing, the hydrostatic pressure increasing at a constant rate is applied from below the test specimen, whilst firmly clamped in the test head of 100cm2 area, until penetration water-drop occurs in three places. Record the pressure at the moment water first appears at the third place in the specimen.

Why does Hydrostatic Head Test Matter?

Ensure product quality: Fabrics, especially outdoor material, must have good water resistance property. Through hydrostatic head test, the producer can evaluate whether they meet the needed standard for waterproof performance, which help to prevent product failures.
Comparing Materials: By using the same testing methods and machine, producers can compare the water resistance of different fabrics and help them make decisions about which materials to use in their products.
Regulatory compliance: In many cases, producers need to meet certain regulatory requirements regarding the water resistance of their products. Through standard hydrostatic head test, producers can ensure that their products meet these requirements and avoid any potential legal or regulatory issues.

Hydrostatic Pressure Test Standards

The hydrostatic head test is a standardized procedure used to evaluate the water resistance of fabric and materials. Several test standards ensures the consistency, accuracy, and reliability throughout distinctive industries and applications. A number of the maximum usually referenced test standards (also known as waterproof testing standards) contains:
ISO 811: This International Organization for Standardization (ISO) standard identifies the technique for determining the resistance of fabric to water penetration using a hydrostatic pressure test. It outlines the apparatus, sample preparation, test procedure, and calculation approach for figuring out the hydrostatic head score of textiles.
IS L 1092: This Japanese Industrial Standard (JIS) states the approach for determining the resistance of textiles to water penetration underneath hydrostatic pressure. It provides guidelines for sample preparation, test conditions, and calculation techniques to assess the waterproofing belongings of fabric used in varied applications.
AATCC Test Method 127: It is published by the American Association of Textile Chemists and Colorists (AATCC); this technique outlines the process for determining the resistance of a fabric to water penetration with the use of a hydrostatic pressure test. It covers pattern instruction, test circumstances, and calculation strategies for determining the hydrostatic head rating of textiles.
ASTM D751: Developed by the American Society for Testing and Materials (ASTM), this widely covers the determination of hydrostatic resistance of fabrics coated with rubber or plastics. It gives guidelines for pattern preparation, test conditions, and calculation approaches to evaluate the waterproofing properties of substances utilized in rainwear, tents, and different outdoor equipment.
BS EN 20811 / ISO 811: This European standard, additionally followed through ISO, specifies a hydrostatic pressure test technique for assessing the water resistance of fabrics. It presents exact commands for undertaking the test, including sample conditioning, apparatus setup, test process, and calculation of hydrostatic head values.
EN 20811: This European standard agrees the test method for defining the resistance of a material to water penetration is done by the custom of a hydrostatic strain test. It includes pattern practice, device setup, test method, and intention methods for defining the hydrostatic head rating of fabrics.
GB/T 4744: This standard specifies the method for determining the water resistance of fabrics using a hydrostatic pressure test.
FZT 01004: This standard specifies the method for determining the water penetration resistance of fabrics using a hydrostatic pressure test.
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