ISO 9073-15:2007

Overview

ISO 9073-15:2007 is an international standard developed by the International Organization for Standardization (ISO) that specifies a test method for determining the air permeability of nonwoven textile materials. The standard focuses on measuring the flow of air passing perpendicularly through a defined area of fabric, applicable to a wide range of nonwoven materials, including treated or untreated laminates with varying basis weights. This method ensures consistent and accurate assessment of air flow characteristics essential for quality control and product development in the textiles industry.

Key Topics

• Scope and Applicability
  The standard applies primarily to nonwoven fabrics, including laminates, regardless of treatment or basis weight. It ensures versatile use across different nonwoven types.

• Air Permeability Definition
  Air permeability is defined as the velocity of air passing through a material perpendicularly under a specified pressure differential, usually expressed in liters per square centimeter per second (l/cm²·s).

• Test Apparatus
  The apparatus includes a test head with a circular test area, clamping system, vacuum pump for airflow control, pressure sensors or manometer, flowmeter or variable orifice, and calibration plates for equipment verification.

• Testing Procedure
  Samples are conditioned to a standard atmosphere before testing, typically cut into 100 mm × 100 mm specimens. Each specimen is secured on the test head to prevent leakage, and air flow is induced perpendicularly through the fabric at controlled pressure differentials (commonly 100 Pa, 125 Pa, or 200 Pa). Airflow measurements are recorded once stabilized.

• Calculation and Reporting
  The average air permeability and coefficient of variation for the test specimens are calculated. Results are reported with supporting data such as specimen type, number of specimens, test conditions, surface area, pressure applied, and any deviations from the standard. This ensures reproducibility and comparability.

Applications

• Quality Control in Textile Manufacturing
  Air permeability testing is crucial to evaluate breathability and ventilation properties of nonwoven textiles, influencing product performance such as comfort, filtration, and insulation.

• Product Development
  Designers and engineers use air permeability data to tailor fabric characteristics for specific applications, such as medical textiles, hygiene products, industrial filters, and protective clothing.

• Regulatory Compliance and Certification
  Industries rely on ISO 9073-15:2007 for compliance with international standards and customer requirements related to textile air flow characteristics.

• Research and Innovation
  The standard provides a reliable method for academic and industrial research on new nonwoven materials, coatings, and laminates aiming to optimize air permeability features.

Related Standards

ISO 9073-15:2007 is part of the broader ISO 9073 series focused on test methods for nonwovens. Complementary parts include:

• ISO 9073-1: Determination of mass per unit area
• ISO 9073-2: Determination of thickness
• ISO 9073-3: Determination of tensile strength and elongation
• ISO 9073-16: Determination of resistance to penetration by water (hydrostatic pressure)
• ISO 9073-17: Determination of water penetration (spray impact)

These related parts collectively enable comprehensive characterization of nonwoven textiles, supporting enhanced quality assurance and innovation efforts.

Adopting ISO 9073-15:2007 ensures standardized, reproducible, and reliable measurement of air permeability in nonwoven materials, supporting manufacturers, researchers, and quality control professionals in producing high-performance textile products.