BS EN ISO 527-2-2025 PDF

Full title and description

STB BS EN ISO 527-2:2025 — Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and extrusion plastics. This publication is the 2025 revision of the Part 2 test-method specification (third edition) and is published as an international standard (ISO) and adopted in regional/national catalogs (EN, BS and STB designations where applicable).

Abstract

Specifies test conditions for determining tensile properties of moulding and extrusion plastics, based on the general principles given in ISO 527-1. Covers preferred specimen types, preparation, test speeds and environmental conditions for rigid and semi‑rigid thermoplastics and thermosets (including filled and short‑fibre reinforced compounds), and references the multipurpose specimen forms of ISO 20753. The 2025 revision updates specimen references (renaming 1A/1B to A1/A2), clarifies structure and aligns references with ISO 527-1:2019. It is not intended for thin flexible films (<1 mm) or for rigid cellular/sandwich structures.

General information

• Status: Published / Current
• Publication date: June 2025 (ISO edition 3: 2025-06; BS EN adoption published June 2025).
• Publisher: International Organization for Standardization (ISO); adopted as EN ISO and published by national bodies (example: BSI as BS EN ISO 527-2:2025).
• ICS / categories: 83.080.01 (Plastics in general).
• Edition / version: Edition 3 (2025).
• Number of pages: 11 pages (ISO official document length).

Scope

Defines the specific test conditions for tensile testing of moulding and extrusion plastics (rigid and semi‑rigid thermoplastics and thermosets, including filled and short‑fibre reinforced materials, and thermotropic liquid crystal polymers). Specifies specimen types (moulded or machined multipurpose specimens — ISO 20753 preferred), test speeds, grips, and environmental conditioning required to produce comparable tensile property data. Explicitly excludes very thin flexible films (<1 mm) and generally excludes rigid cellular or sandwich-structure materials (reference ISO 1926 for cellular materials).

Key topics and requirements

• Test conditions and procedures for tensile testing of moulding and extrusion plastics (based on ISO 527-1 general principles).
• Specimen design and dimensions — moulded or machined specimens; preference for ISO 20753 multipurpose specimens; updated specimen identifiers (A1, A2 replacing earlier 1A/1B).
• Material scope — rigid/semi‑rigid thermoplastics and thermosets, including filled and short‑fibre reinforced compounds; inclusion of thermotropic liquid crystal polymers.
• Environmental conditioning (temperature and humidity) and test speeds appropriate to material class and specimen dimensions.
• Requirements for grips, extensometers or measurement methods, and reporting of tensile modulus, tensile strength, elongation at break and related results.
• Notes on exclusions and related test standards (films, cellular materials, fibre‑reinforced long‑fibre composites addressed in other parts of ISO 527 or related standards).

Typical use and users

Used by plastics manufacturers, materials testing laboratories, product designers, quality assurance teams and research organisations to characterise tensile properties for material selection, quality control, verification of product performance, and comparison of formulations or suppliers. Also used by standards writers and test-laboratory accreditation bodies to ensure consistent tensile-testing practice.

Related standards

ISO 527 series (notably ISO 527-1 general principles, ISO 527-3 for films and sheets, ISO 527-4/527-5 for fibre-reinforced plastics), ISO 20753 (multipurpose specimen), and ISO 1926 (rigid cellular materials). Regional and national adoptions include EN ISO 527-2 and BS EN ISO 527-2 (national publications by CEN/BSI) and national identifiers such as STB when adopted in Belarus.

Keywords

tensile test, tensile properties, plastics testing, moulding plastics, extrusion plastics, specimen, ISO 527-2, EN ISO 527-2, BS EN ISO 527-2, STB, ISO 20753, tensile modulus, tensile strength, elongation at break.

FAQ

Q: What is this standard?

A: ISO 527-2:2025 (published as EN ISO and adopted by national bodies such as BSI and STB where applicable) is the international specification that defines the test conditions for tensile testing of moulding and extrusion plastics (third edition, 2025).

Q: What does it cover?

A: It covers specimen selection and dimensions, environmental conditioning, test speeds, gripping and measurement methods, and reporting requirements to determine tensile modulus, tensile strength and elongation for rigid and semi‑rigid moulding and extrusion plastics. It also notes materials and constructions for which the methods are not suitable (thin films, cellular/sandwich structures).

Q: Who typically uses it?

A: Plastics manufacturers, materials testing laboratories, R&D and product development teams, quality managers, and conformity assessment bodies use the standard to generate reproducible tensile-property data for specification, comparison and compliance.

Q: Is it current or superseded?

A: Current — ISO 527-2:2025 is the active (third) edition published in 2025 and replaces earlier editions (the 2012 version has been withdrawn). National and regional adoptions (for example BS EN ISO 527-2:2025) were published in mid‑2025.

Q: Is it part of a series?

A: Yes — it is Part 2 of the ISO 527 series. Other parts cover general principles (ISO 527-1), films and sheets (ISO 527-3), and various forms of fibre‑reinforced plastics (ISO 527-4, ISO 527-5). The standard is intended to be used together with ISO 527-1 and referenced specimen standards such as ISO 20753.

Q: What are the key keywords?

A: Tensile test, tensile properties, plastics, moulding, extrusion, specimen, tensile modulus, tensile strength, elongation at break, ISO 527-2, EN ISO, BS EN, STB, ISO 20753.