ISO 9073-4-2021 PDF

Full title and description

ISO 9073-4:2021 — Nonwovens — Test methods — Part 4: Determination of tear resistance by the trapezoid procedure. This international standard specifies the trapezoid test method used to determine the tear resistance of nonwoven fabrics, providing a repeatable procedure for laboratory testing and reporting of tear-resistance values for quality control and comparative evaluation.

Abstract

The document defines a standardised trapezoid procedure to measure tear resistance of nonwovens. It covers the principle of the test, specimen preparation and conditioning, the test sequence using a tensile testing machine, expression of results and test-report requirements. The procedure is applicable to a wide range of nonwoven materials.

General information

• Status: Published.
• Publication date: January 2021 (published 29 January 2021 in some catalogues).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 59.080.30 (Textiles — Fabrics and textiles testing / nonwovens).
• Edition / version: Edition 3 (2021).
• Number of pages: 6.

Scope

This part of ISO 9073 specifies the trapezoid method for determination of tear resistance of nonwoven fabrics. It is intended to be used for the assessment of tear behaviour of nonwovens in laboratory conditions and is applicable across a broad range of nonwoven constructions. This 2021 edition replaces earlier versions of the standard (for example ISO 9073-4:1997).

Key topics and requirements

• Definition and purpose of the trapezoid tear-resistance procedure for nonwovens.
• Specimen preparation, orientation and preconditioning prior to testing.
• Test apparatus requirements (universal/tensile testing machine and appropriate grips) and general test parameters.
• Test procedure: initiation of tear, controlled crosshead movement, recording of force–extension data and identification of characteristic tear force(s).
• Expression of results (tear resistance values and units) and required items for the test report to ensure reproducibility and comparability.
• Applicability notes and limits of the method for different nonwoven types and end-use evaluations.

These topics are specified and summarised in the ISO 9073-4:2021 text.

Typical use and users

Typical users include textile and nonwovens manufacturers, independent testing and certification laboratories, product development and R&D teams, and quality‑assurance professionals who need consistent, comparable tear-resistance data for specification, acceptance testing and product development. Test-equipment suppliers and materials test labs commonly refer to ISO 9073-4 when specifying grips and machines for tear testing.

Related standards

ISO 9073-4 is one part of the ISO 9073 series of test methods for nonwovens. Other parts of the series cover mass per unit area, thickness, tensile strength and elongation, absorption, bending length, liquid strike-through and a number of additional specific test methods; users often consult related parts in the ISO 9073 family to build a comprehensive test programme for nonwoven materials. The 2021 edition of part 4 supersedes earlier 1997 and 1989 editions.

Keywords

ISO 9073-4, nonwovens, trapezoid procedure, tear resistance, textile testing, test method, tensile testing, material characterisation.

FAQ

Q: What is this standard?

A: ISO 9073-4:2021 is the international standard that specifies the trapezoid test procedure for determining tear resistance of nonwoven fabrics.

Q: What does it cover?

A: It covers specimen preparation and conditioning, the trapezoid tearing procedure using a tensile testing machine, expression of results and required test-report items so that tear-resistance values can be compared between laboratories.

Q: Who typically uses it?

A: Nonwoven manufacturers, independent test laboratories, QA/QC teams, research and product‑development groups, and test-equipment suppliers use this standard for measuring and specifying tear properties of nonwovens.

Q: Is it current or superseded?

A: ISO 9073-4:2021 is the current published edition (2021) and it replaces earlier editions such as ISO 9073-4:1997. The ISO catalogue indicates the 2021 edition is published and under the normal systematic review lifecycle.

Q: Is it part of a series?

A: Yes — it is part of the ISO 9073 series (test methods for nonwovens), which includes parts for mass per unit area, thickness, tensile properties, absorption and other specific methods used together to characterise nonwoven materials.

Q: What are the key keywords?

A: Key keywords include: nonwovens, tear resistance, trapezoid procedure, ISO 9073, textile testing, specimen preparation, test report, material characterisation.