ISO 899-2-2024 PDF

Full title and description

St ISO 899-2:2024 — Plastics — Determination of creep behaviour — Part 2: Flexural creep by three-point loading. This international standard specifies a laboratory method for measuring the flexural (bending) creep of plastics using a simple freely supported beam loaded at mid-span (three-point loading), under defined pre‑treatment, temperature and humidity conditions.

Abstract

ISO 899-2:2024 defines procedure, apparatus and reporting requirements to determine time-dependent deflection (creep) of plastic test specimens in flexure under constant load. It is applicable to rigid and semi-rigid non-reinforced, filled and fibre‑reinforced plastics formed as standard specimens (moulded or machined). The method is intended to produce data for engineering design, quality control, research and development. Limitations and special notes are given for certain fibre-reinforced and cellular plastics.

General information

• Status: Published (International Standard).
• Publication date: 8 October 2024.
• Publisher: ISO — International Organization for Standardization.
• ICS / categories: 83.080.01 (Plastics in general).
• Edition / version: Edition 3 (ISO 899-2:2024).
• Number of pages: 16 pages.

Scope

This document specifies a method for determining the flexural creep of plastics in the form of standard test specimens under specified conditions of pre‑treatment, temperature and humidity. It applies only to a simple freely supported beam loaded at mid‑span (three‑point loading test). The method is suitable for rigid and semi‑rigid non‑reinforced, filled and fibre‑reinforced plastics (subject to caveats about fibre orientation) and is intended to supply data for engineering design, quality control and R&D. The standard notes it may be unsuitable for some fibre‑reinforced materials and for rigid cellular plastics (see related standards for cellular plastics).

Key topics and requirements

• Principle of three‑point flexural creep: specimen support, mid‑span constant load and measurement of deflection over time.
• Specimen preparation and dimensions, including moulding or machining requirements and pre‑treatment (conditioning) procedures.
• Test apparatus: supports, loading system (deadweights or equivalent), deflection measurement devices and environmental control (temperature, humidity).
• Selection of load levels and test durations appropriate to material class and intended application.
• Data acquisition and expression of results: deflection/time curves, creep rate, reporting of test conditions and uncertainties.
• Limitations and applicability notes for fibre‑reinforced and rigid cellular plastics; references to other standards for special cases.
• Test report content requirements to ensure reproducibility and comparability of results.

Typical use and users

Used by materials testing laboratories, plastics manufacturers, product designers and R&D departments to characterise time‑dependent bending behaviour of plastic materials. Typical applications include design verification, selection of materials for load‑bearing components, quality control, comparative material evaluation and long‑term performance assessment under sustained bending loads.

Related standards

Related documents commonly referenced with ISO 899-2:2024 include ISO 899-1 (Part 1: Tensile creep — ISO 899-1:2017), ISO 472 (plastics — vocabulary/definitions), standards addressing cellular plastics (ISO 1209-1 / ISO 1209-2) and other test standards such as ISO 527 series (tensile properties) and ISO 4582 (expression of test results and reporting guidance). National and regional adoptions (for example EN/BS adoptions) may exist that transpose ISO 899-2:2024 into local collections.

Keywords

plastics, creep, creep behaviour, flexural creep, three-point loading, bending creep test, long-term deflection, test method, conditioning, ISO 899-2:2024.

FAQ

Q: What is this standard?

A: ISO 899-2:2024 is an international test standard titled "Plastics — Determination of creep behaviour — Part 2: Flexural creep by three‑point loading" that specifies how to measure flexural creep of plastic specimens under a constant mid‑span load.

Q: What does it cover?

A: It covers specimen preparation, apparatus, environmental conditions, test procedure, selection of loads and durations, data acquisition and reporting for three‑point flexural creep tests on rigid and semi‑rigid plastics, including non‑reinforced, filled and many fibre‑reinforced materials (with applicability notes).

Q: Who typically uses it?

A: Materials testing laboratories, manufacturers of plastics and polymer products, design engineers, quality managers and research and development groups use this standard to obtain comparable flexural creep data for selection, design and quality purposes.

Q: Is it current or superseded?

A: It is current; ISO 899-2:2024 was published on 8 October 2024. It replaces earlier versions (ISO 899-2:2003 and its amendment) that were withdrawn.

Q: Is it part of a series?

A: Yes — it is Part 2 of the ISO 899 series on determination of creep behaviour. Part 1 (ISO 899-1:2017) covers tensile creep; together the parts address common creep test methods for plastics.

Q: What are the key keywords?

A: Key keywords are "plastics", "creep", "flexural creep", "three‑point loading", "test method", "long‑term deflection" and "ISO 899-2:2024".