UNE-EN ISO 527-4-1997 PDF

Full title and description

STB UNE-EN ISO 527-4:1997 — Plastics — Determination of tensile properties — Part 4: Test conditions for isotropic and orthotropic fibre‑reinforced plastic composites. The title as given combines a national prefix (STB/СТБ), the Spanish adoption prefix UNE‑EN, and the original ISO designation (ISO 527‑4:1997). The "STB" prefix in some catalogs commonly appears as a national designation (Cyrillic СТБ) used for Belarusian national standards, though in seller/product listings it can also appear as a vendor/catalog code; this dual use is not always clarified by suppliers.

Abstract

This part of ISO 527 specifies the test conditions for determining tensile properties of isotropic and orthotropic fibre‑reinforced plastic composites (thermoset and thermoplastic composites with non‑unidirectional or multidirectional reinforcements). It builds on the general principles in ISO 527‑1 and complements other parts of the ISO 527 series that cover molding/extrusion plastics, films and sheets, and unidirectional reinforcements.

General information

• Status: Withdrawn / superseded (national and European adoptions have been cancelled and replaced by later editions).
• Publication date: ISO original: 1997 (mid‑1997); UNE (Spanish) publication listed 21 November 1997. Withdrawal / supersession occurred in 2022 with later ISO/EN revisions published subsequently.
• Publisher: International: ISO (original). European adoption: CEN / national adoption bodies (e.g., AENOR for UNE‑EN). National prefixes in product listings may reflect Belarusian national designation (СТБ) or vendor cataloging.
• ICS / categories: 83.120 (Reinforced plastics / fibre‑reinforced composites).
• Edition / version: ISO 527‑4:1997 (adopted as EN ISO 527‑4:1997 and UNE‑EN ISO 527‑4:1997); later superseded by ISO/EN revisions (ISO 527‑4:2021 / EN ISO 527‑4:2021 and corrected/adopted versions published 2022 and later).
• Number of pages: Varies by publisher and national edition (examples in public catalogs: ~11 pages for some listings, 17 pages in AFNOR catalog, and 18–19 pages in some UNE/AENOR records). Differences reflect national forewords/translations and formatting.

Scope

Specifies test conditions for the determination of tensile properties (tensile modulus, tensile strength, strain at break, etc.) of isotropic and orthotropic fibre‑reinforced plastic composites. The method is intended for composites with non‑unidirectional reinforcements (mats, woven fabrics, chopped strands, hybrids, prepregs, short/milled fibres) and for symmetrical multidirectional laminates; unidirectional composites are covered by ISO 527‑5. Test specimens are normally machined from test panels made in accordance with ISO 1268 or equivalent methods, or taken from finished/semi‑finished products with appropriate flat areas.

Key topics and requirements

• Definition of specimen types and orientation for 1‑direction and 2‑direction test pieces (El, E2, σM1, σM2, etc.).
• Test speeds, gauge lengths and strain measurement methods consistent with ISO 527‑1 general principles.
• Specimen preparation (machining from panels or finished parts) and conditioning requirements prior to testing.
• Reporting of results, calculation procedures for engineering stress/strain, modulus determination and tensile strength.
• Precision and reproducibility statements and guidance on alignment/fixation of specimens (annexes addressing specimen preparation and alignment).

Typical use and users

Used by materials and test laboratories, composite manufacturers, R&D groups and quality control/assurance personnel involved with fibre‑reinforced plastics who need standardized tensile test methods for product development, specification compliance and comparative testing. Test houses performing certification or material characterization for engineering applications commonly reference this part alongside ISO 527‑1 and ISO 1268‑series preparation methods.

Related standards

ISO 527 series (notably ISO 527‑1: general principles; ISO 527‑2: molding and extrusion plastics; ISO 527‑3: films and sheets; ISO 527‑5: unidirectional composites), ISO 1268 (panel preparation), ISO 2818 (specimen machining), and related national/adopted EN/UNE publications and later ISO/EN revisions (ISO/EN 527‑4:2021/2022 and subsequent revisions).

Keywords

tensile test, tensile properties, plastics, composites, fibre‑reinforced plastics, ISO 527, specimen preparation, tensile modulus, tensile strength, EN adoption, UNE, STB (СТБ).

FAQ

Q: What is this standard?

A: ISO 527‑4:1997 (adopted as EN ISO 527‑4:1997 and UNE‑EN ISO 527‑4:1997) is a standardized test method that defines conditions to determine tensile properties of isotropic and orthotropic fibre‑reinforced plastic composites.

Q: What does it cover?

A: It covers specimen types and orientations, specimen preparation from panels or finished parts, conditioning, test speeds, measurement methods, calculations (stress/strain, modulus, strength) and reporting for non‑unidirectional and symmetrical multidirectional fibre‑reinforced composites.

Q: Who typically uses it?

A: Materials testing laboratories, composite manufacturers, R&D and quality/control engineers who need repeatable, comparable tensile property data for fibre‑reinforced plastics.

Q: Is it current or superseded?

A: The 1997 edition has been withdrawn/superseded. European and national adoptions of the 1997 text were cancelled and replaced by later ISO/EN revisions (ISO 527‑4 updates published in 2021/2022 and later). Users should apply the most recent ISO/EN/UNE edition applicable in their jurisdiction.

Q: Is it part of a series?

A: Yes — ISO 527 is a multipart series (part 1: general principles; part 2: molding/extrusion plastics; part 3: films and sheets; part 4: fibre‑reinforced isotropic/orthotropic composites; part 5: unidirectional composites).

Q: What are the key keywords?

A: Tensile properties, tensile test, fibre‑reinforced plastics, composites, specimen preparation, modulus, tensile strength, ISO 527.