Overview
EN ISO 1421:2016 - "Rubber- or plastics-coated fabrics - Determination of tensile strength and elongation at break" is the CEN-endorsed version of ISO 1421:2016. It specifies two standardized laboratory methods for measuring the mechanical performance of fabrics coated with rubber or plastics: the strip (Method 1) and the grab (Method 2) tests. Both methods require a constant rate of extension (CRE) tensile-testing machine and cover testing of conditioned and wet test pieces.
Key Topics and Requirements
- Two test methods
- Method 1 - Strip test: determines tensile strength and elongation at break (full-width test piece between reference marks or jaw nips).
- Method 2 - Grab test: determines tensile strength only (central portion of the width gripped).
- Test environment and conditioning
- Tests apply to specimens in equilibrium with specified standard atmospheres (see ISO 2231) and to wet specimens.
- The standard clarifies time interval between manufacture and testing.
- Apparatus and calibration
- Requires a CRE tensile-testing machine and references calibration/verification requirements (e.g., ISO 7500-1 for force-measuring systems).
- Specimen preparation and dimensions
- Sampling, cutting, pre-tension, gauge length and reference-point marking procedures are specified. The 2016 revision adds narrower test-piece widths (for example 10 mm and 30 mm) and clarifies pre-tension forces.
- Test procedure controls
- Mounting technique, avoidance of slippage, handling of jaw breaks and abnormal results, wet-specimen testing and repeatability considerations.
- Results and reporting
- Calculation and expression of tensile strength, maximum force, elongation at maximum force and elongation at break, plus required test-report details.
Applications and Who Uses It
EN ISO 1421:2016 is used by:
- Manufacturers of coated fabrics for quality control and product specification verification.
- Independent testing laboratories performing certification, compliance testing, and material comparison.
- R&D and materials engineers evaluating new coating systems or substrate combinations.
- Purchasing and specification writers drafting technical requirements for tarpaulins, inflatable structures, awnings, conveyor covers, protective clothing and other coated-textile products.
Practical benefits include consistent, comparable tensile property data for material selection, performance benchmarking, warranty claims and conformity to customer or regulatory specifications.
Related Standards
- ISO 2231 - standard atmospheres for conditioning and testing of rubber- or plastics-coated fabrics.
- ISO 7500-1 - calibration and verification of static uniaxial testing machines (force-measuring systems).
- ISO 2286-2 - related test methods for roll characteristics (mass per unit area).
Keywords: EN ISO 1421:2016, tensile strength, elongation at break, rubber-coated fabrics, plastics-coated fabrics, strip test, grab test, CRE tensile testing machine, coated fabrics testing.
