EN ISO 527-1:2019 PDF

Overview

EN ISO 527-1:2019 - "Plastics - Determination of tensile properties - Part 1: General principles" (CEN adoption of ISO 527-1:2019) sets the general principles and requirements for tensile testing of plastics and plastic composites. It defines test objectives, specimen types, apparatus and measurement methods used to determine key tensile properties such as tensile strength, tensile modulus, and the stress–strain relationship under specified conditions. This edition supersedes EN ISO 527-1:2012 and aligns with the wider ISO 527 series for tensile testing.

Key topics and technical requirements

• Scope and applicability: Methods are selectively suitable for rigid and semi-rigid thermoplastics and thermosets, filled/reinforced compounds, fibre-reinforced composites (unidirectional and non‑unidirectional), prepregs and thermotropic liquid crystal polymers. Not normally suitable for rigid cellular materials (see ISO 1926) or sandwich structures containing cellular cores.
• Apparatus and measurement: Requirements for testing machines, grips, force indicators, extensometers (strain indicators), test speeds and data recording. Annex C includes calibration requirements for tensile modulus determination.
• Specimens and preparation: Definitions of specimen shapes, dimensions and preparation, gauge marks, checking for anisotropy and conditioning prior to testing.
• Test procedure: Guidance on test atmosphere, gripping, prestress, extensometer setting, selected test speeds and recording of data.
• Calculations and reporting: Methods for calculating stress, strain (extensometer-based and nominal), tensile modulus (chord and regression slopes), Poisson’s ratio, statistical parameters and required test report contents.
• Accuracy and precision: Updates on extensometer accuracy (for gauge lengths L ≤ 50 mm the accuracy is set to ±1 µm), precision statements and informative annexes on strain at yield and extensometer accuracy for Poisson’s ratio.

Practical applications

• Material characterization and comparison (tensile strength, stiffness)
• Product development and R&D for plastics and composite components
• Quality control and acceptance testing in manufacturing
• Validation of simulation inputs (material models using tensile modulus and stress–strain curves)
• Compliance and certification where tensile properties are specified

Who uses this standard

• Materials engineers and R&D laboratories
• Test laboratories and quality assurance teams
• Manufacturers of plastics, composites and molded/extruded products
• Certification bodies and regulatory assessors

Related standards

• ISO 527 (other parts) - detailed specimen types and methods (see the ISO 527 series)
• ISO 1926 - tensile testing of rigid cellular plastics (where EN ISO 527-1 is not applicable)
• National adoptions: EN ISO 527-1:2019 replaces EN ISO 527-1:2012

Keywords: EN ISO 527-1:2019, tensile properties, plastics tensile testing, tensile modulus, tensile strength, plastic composites, ISO 527.