ISO 9073-11:2026

Overview

ISO 9073-11:2026, Nonwovens - Test methods - Part 11: Run-off, published by the International Organization for Standardization (ISO), specifies standardized methods for evaluating the run-off characteristics of nonwoven fabrics. This test method determines the amount of test liquid (simulated urine) that runs off a nonwoven sample when poured onto it while placed over an absorbent medium on an inclined plane. The standard is ideal for comparing the run-off performance of different nonwoven materials, supporting product development and quality control in industries where liquid management is critical. However, the methods are not intended to simulate in-use conditions for finished products.

Key Topics

• Run-off Measurement: The primary goal is to determine the mass or percentage of test liquid that runs off a nonwoven specimen, providing meaningful data for material comparison.
• Testing Options:
  • Option A: Basic test for hydrophilic (water-absorbing) nonwovens.
  • Option B: Repeated test using the same nonwoven specimen to assess consistency across multiple exposures.
  • Option C: Modified test for hydrophobic (water-repellent) nonwovens, using a different incline angle to better differentiate repellency.
• Simulated Urine: The test liquid is a 9 g/l sodium chloride solution in demineralized water, with specific surface tension requirements to mimic real-world fluids.
• Sample Conditioning: Samples must be properly conditioned to ensure reliable, reproducible results.
• Sampling Procedures: Guidance is provided on selecting and preparing laboratory samples, ensuring statistical relevance and traceability.

Applications

The methods outlined in ISO 9073-11:2026 are useful in various stages of nonwoven product development and manufacturing, particularly in:

• Hygiene Products: Manufacturers of diapers, adult incontinence pads, and feminine hygiene products can assess the liquid management performance of nonwoven coverstocks.
• Medical Textiles: Enables product comparisons for surgical drapes, wound dressings, and other medical disposables where fluid control is essential.
• Quality Control: Ensures consistency of absorbency and repellency performance in nonwoven rolls or lots prior to further processing or use in end products.
• Research & Development: Option D and various parameters outlined allow R&D teams to investigate alternative testing conditions and additional material characteristics, encouraging innovation and enhanced product performance.

Related Standards

Utilizing ISO 9073-11:2026 alongside other relevant standards strengthens overall material assessment:

• ISO 9073-6: Focuses on absorption characteristics of nonwovens, complementing run-off data.
• ISO 139: Specifies standard atmospheres for textile conditioning and testing.
• NWSP 010.1: Details standard test methods for nonwoven absorption-essential for verifying absorbent materials.
• NWSP 70.3: Methods for determining liquid strike-through time using simulated urine, relevant for coverstock performance.
• NWSP 005.0: Guidelines for nonwoven sampling, ensuring representative testing.
• ISO 2859-1 / ISO 3951-1: Sampling procedures for inspection by attributes and variables, crucial for lot-based quality assurance.
• ISO 5636-1: Provides methods for determining air permeance in paper and board, which may be relevant for absorbent mediums.

In summary:
ISO 9073-11:2026 delivers standardized, repeatable methods for evaluating the run-off behavior of nonwovens, enabling objective product comparisons and supporting both quality assurance and innovative textile research. Accurate run-off measurement is essential for any application where fluid management by nonwovens is critical.