Overview
EN ISO 9073-18:2023 (Corrected version 2024-05) - Nonwovens - Test methods - Part 18: Determination of tensile strength and elongation at break using the grab tensile test - is a CEN-endorsed ISO test method for measuring the breaking force and elongation at break of nonwoven materials using the grab tensile test. The method applies to specimens in a conditioned or wet state, and is specified for use with constant rate of specimen extension (CRE) tensile testers. The standard is not applicable to materials with a high percentage of stretch, and results from machines that operate on different test principles should not be directly compared.
Key topics and requirements
- Scope & applicability: Test method for nonwovens in conditioned or wet states; excludes highly stretchable materials.
- Testing principle: Grab tensile test to determine tensile strength (breaking force) and elongation at break.
- Apparatus: Uses CRE tensile testers; constant-rate-of-loading (CRL) instruments are referenced (ISO 2062:2009, Annex A) only by agreement.
- Sampling & specimen preparation: Clauses cover lot sampling, laboratory samples, specimen dimensions, marking, and wet specimen handling.
- Conditioning: Requires controlled atmosphere per referenced standards before testing.
- Calibration & verification: Procedures for preparing, calibrating and verifying the tensile test system and clamping mechanism.
- Test procedure: Gauge length, rate of extension, mounting, operation, and handling of slippage or jaw breaks.
- Calculations & results: Methods to calculate breaking force and apparent elongation; expression of results and reporting requirements.
- Quality control: Precision and bias information and an informative annex on causes of low precision in grab strength testing.
Practical applications and users
This standard is practical for organizations needing reliable, repeatable measurements of nonwoven strength and elongation, including:
- Nonwoven manufacturers (hygiene, filtration, geotextiles, medical disposables)
- Textile and materials testing laboratories (QC, incoming inspection, R&D)
- Automotive and construction suppliers using nonwovens in composites or insulation
- Regulatory bodies and procurement teams requiring standard test data for specifications
Using EN ISO 9073-18:2023 ensures consistent test conditions (conditioned/wet state) and comparable data when CRE testers and the method are used consistently.
Related standards
- ISO 139 - Standard atmospheres for conditioning and testing (referenced)
- ISO 2062:2009, Annex A - Information on CRL instruments (constant-rate-of-loading)
- Sampling standards such as ISO 186 and inspection procedures referenced in the normative section
Keywords: EN ISO 9073-18:2023, grab tensile test, nonwovens, tensile strength, elongation at break, CRE tensile tester, conditioned test, wet state, textile testing.