ISO 8256-2023 PDF

Full title and description

ISO 8256:2023 — Plastics — Determination of tensile-impact strength. This International Standard specifies two test methods (Method A and Method B) for determining the tensile-impact strength of plastics under defined conditions; the methods are suitable for rigid materials and for materials too flexible or thin to be tested by Charpy/Izod procedures, and are intended for material characterization, production control and quality assessment.

Abstract

ISO 8256 defines tensile-impact tests that are essentially tensile tests carried out at relatively high strain rates. The standard describes specimen types, test conditions and procedures for assessing brittleness or toughness of plastics, indicates limitations (results are not directly suitable for design calculations), and notes differences that can arise between moulded specimens and specimens cut from finished products. Two distinct methods (A and B) are provided to cover a range of materials and specimen geometries.

General information

• Status: Published.
• Publication date: November 2023 (ISO issuance: 30 November 2023 / edition published Nov 2023).
• Publisher: ISO — International Organization for Standardization (technical committee ISO/TC 61/SC 2).
• ICS / categories: 83.080.01 (Plastics — general).
• Edition / version: Edition 3 (2023).
• Number of pages: 16 (core ISO document). Note: some national/adopted versions (for example EN/BS publications) are distributed in PDF/print with additional national forewords and cover pages and may show a larger page count (commonly ~24 pages).

Scope

This standard specifies two methods for determining the tensile-impact strength of plastics under defined impact velocities and specimen conditions. It applies to rigid plastics and is particularly useful for materials that are too thin or too flexible for Charpy or Izod impact tests; it may be used with specimens prepared from moulding materials or taken from finished or semi-finished products. The methods are intended for material investigation, production control and quality control, but the results are not intended as direct input for component design calculations.

Key topics and requirements

• Two methods defined (Method A and Method B) to cover different specimen types and test conditions.
• Test is a tensile-impact (high strain-rate tensile) procedure to determine tensile-impact strength and to assess brittleness/toughness.
• Specimen preparation rules, conditioning, notch configuration (where applicable) and measurement/reporting requirements.
• Statements on applicability and limitations (differences between moulded specimens and specimens cut from finished parts; not for direct use in design calculations).
• Guidance for use in production control and quality control contexts.

Typical use and users

Test laboratories, materials characterization groups in industry, plastics manufacturers, QA/QC teams, research institutions and test-equipment suppliers use ISO 8256 to evaluate tensile-impact behaviour of plastics and to support material selection, comparative testing and production control. Test-equipment vendors and labs implementing plastics testing programs commonly reference ISO 8256 alongside related impact standards.

Related standards

Standards commonly used together with or as complements to ISO 8256 include ISO 179 (Charpy impact), ISO 180 (Izod impact), and relevant ASTM methods (for example ASTM D1822 for tensile-impact and ASTM D256 for Izod), as these documents address related impact test types and specimen configurations. Users often consult these standards when choosing the most appropriate impact test for a material or product.

Keywords

tensile-impact strength; plastics testing; impact at high strain rate; Method A; Method B; toughness; brittleness; production control; ISO/TC 61/SC 2.

FAQ

Q: What is this standard?

A: ISO 8256:2023 is an International Standard that specifies two tensile-impact test methods for determining the tensile-impact strength of plastics (Edition 3, published November 2023).

Q: What does it cover?

A: It covers test procedures, specimen types and conditions for tensile-impact testing (high strain-rate tensile tests), applicability to rigid and thin/flexible plastics, reporting requirements and the limitations of test results for design use.

Q: Who typically uses it?

A: Materials and test laboratories, plastics manufacturers, QA/QC teams, product developers and research institutions use ISO 8256 for material characterization, comparative testing and production/quality control. Test-equipment suppliers also implement fixtures and machines that comply with or support the standard.

Q: Is it current or superseded?

A: ISO 8256:2023 is the current published edition (Edition 3). It replaced the previous ISO 8256:2004 edition.

Q: Is it part of a series?

A: It is part of the family of plastics impact-testing standards and is commonly used alongside ISO 179 (Charpy) and ISO 180 (Izod) and comparable ASTM methods; the ISO/TC 61 series addresses many plastics testing methods.

Q: What are the key keywords?

A: Tensile-impact, impact strength, plastics, toughness, brittleness, Method A, Method B, high strain rate.