Overview
SIST EN ISO 811:2018 is a European and international standard that specifies a uniform method for determining the resistance of textiles to water penetration using a hydrostatic pressure test. This standard is applicable to all types of fabrics that are intended to be water resistant, regardless of whether they have undergone water-resistant or water-repellent treatments. The methodology described provides a consistent approach to assess the hydrostatic head supported by a fabric, which is a direct indicator of the material’s waterproof performance.
Key Topics
- Hydrostatic Pressure Test Principle: The fabric sample is subjected to steadily increasing water pressure until water penetrates the material in three distinct places. The pressure at the moment the third penetration occurs is recorded as the test result.
- Applicability: Suitable for all fabrics intended to resist water penetration, including those with or without special finishes.
- Test Conditions: Specifies details for specimen handling, conditioning, clamping, and water temperature (with measurements typically at either 20°C or 27°C).
- Pressure Application: Water pressure can be applied from above or below the fabric; test parameters and any variations must be recorded in the test report.
- Sampling and Results Reporting:
- Minimum of five specimens from different fabric areas are required to ensure statistical validity.
- Individual pressures and the mean result are to be reported, measured in centimeters or millibars of water.
- Requires test atmosphere conditioning and specifies acceptable accuracy levels for measurement.
- Documentation: Clear requirements for test reporting, including reference to test conditions, specimen details, and any deviations from the standard procedure.
Applications
- Textiles Manufacturing: Ensures that technical textiles, garments, and protective clothing meet industry or regulatory standards for water resistance.
- Quality Assurance: Supports manufacturers, suppliers, and laboratories in quality control processes and in substantiating product claims regarding water penetration resistance.
- Product Development: Provides a basis for research and development of advanced water-resistant materials for outdoor equipment, sportswear, and industrial applications.
- Certification and Compliance: Facilitates conformity with European and international regulations, assisting companies in market access and harmonized product evaluation.
Common products tested using the ISO 811 hydrostatic pressure test include:
- Outdoor apparel (rainwear, jackets)
- Tents and shelters
- Upholstery and technical textiles for industrial use
- Protective workwear and uniforms
- Medical and hygienic textiles where fluid resistance is critical
Related Standards
- ISO 139: Textiles - Standard atmospheres for conditioning and testing, essential for controlling environmental factors that can affect test outcomes.
- ISO 3696: Specifies water quality for analytical laboratory use, which is relevant for preparing water used in the hydrostatic pressure test.
- ISO 2859-1: Sampling procedures for inspection by attributes, can be applied for broader quality control during product evaluation.
SIST EN ISO 811:2018 supersedes previous standards such as EN 20811:1992 and aligns closely with the requirements of international test methodologies for water penetration.
Practical Value
This standard ensures that all participants in the textile supply chain-manufacturers, testing laboratories, and regulatory authorities-apply a consistent, reliable method to evaluate and compare the water resistance performance of textiles. Adhering to SIST EN ISO 811:2018 supports product safety, reliability, and consumer satisfaction across global markets by clearly defining how to measure and report fabric resistance to water penetration using hydrostatic pressure testing.
Keywords: hydrostatic pressure test, water resistance, textile standards, ISO 811, water penetration, quality control, waterproof fabrics, textile testing, SIST EN ISO 811:2018.
