ISO 10471-2025 PDF

Full title and description

Glass-reinforced thermosetting plastics (GRP) pipes — Determination of the long-term ultimate bending strain and the long-term ultimate relative ring deflection under wet conditions. This International Standard specifies test procedures and extrapolation methods to determine long-term bending strain and to calculate long-term relative ring deflection of GRP pipes tested under wet conditions, using plate or beam-bar loading methods.

Abstract

This document specifies a method for determining by extrapolation the long-term ultimate ring bending strain and for calculating the long-term ultimate relative ring deflection of glass‑reinforced thermosetting plastics (GRP) pipes under wet conditions. Two loading methods are given (plate loading and beam‑bar loading); the procedures include measurement, data extrapolation and reporting conventions for deriving long‑term limits from shorter term tests.

General information

• Status: Published.
• Publication date: August 2025 (ISO record: 2025‑08; national catalogue entry records publication/approval on 27 August 2025).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 23.040.20 (Plastics pipes).
• Edition / version: Edition 3 (ISO 10471:2025).
• Number of pages: 11 pages.

Scope

This standard applies to laboratory determination, by extrapolation from accelerated or short‑term tests, of the long‑term ultimate ring bending strain and the long‑term ultimate relative ring deflection of GRP pipes when tested under wet conditions. It gives two acceptable methods of loading (plate loading and beam‑bar loading), measurement limits and procedures for calculation and reporting of the extrapolated long‑term values. The standard is intended for evaluating GRP pipe performance in environments where moisture affects long‑term mechanical behaviour.

Key topics and requirements

• Definition and objective: determination of long‑term ultimate bending strain and long‑term ultimate relative ring deflection for GRP pipes under wet conditions.
• Two prescribed loading methods: plate loading and beam‑bar loading (both described so laboratories can select appropriate apparatus).
• Test measurement procedures: strain/deflection measurement, environmental (wet) conditioning and test duration considerations.
• Data treatment: extrapolation methods to derive long‑term limits from shorter term creep/flexure data and calculation methods for relative ring deflection.
• Reporting and interpretation: required test report items and limits for relative vertical deflection (notes from earlier editions on measurement ranges are retained where applicable).

Typical use and users

Used by materials and structural testing laboratories, GRP pipe manufacturers, product design engineers, specifiers and certification bodies to assess long‑term deformation behaviour of GRP pipes under moisture‑exposed service conditions. It supports design verification, product development and compliance testing for buried and above‑ground pipeline applications where long‑term bending or ring deflection performance is critical.

Related standards

Standards in the same GRP/piping family and complementary documents include earlier and related ISO publications such as ISO 10471 (previous editions: 2018 and 2003), ISO 10467 (GRP piping systems based on unsaturated polyester resin), ISO 25780 (GRP pipes for jacking installations), and general structural reliability guidance such as ISO 2394. These documents are commonly referenced together when specifying or testing GRP piping systems.

Keywords

GRP, glass‑reinforced thermosetting plastics, pipes, long‑term bending strain, ring deflection, wet conditions, plate loading, beam‑bar loading, creep extrapolation, ISO/TC 138/SC 6.

FAQ

Q: What is this standard?

A: ISO 10471:2025 is an International Standard that specifies methods for determining, by extrapolation from laboratory tests, the long‑term ultimate ring bending strain and the long‑term ultimate relative ring deflection of GRP pipes tested under wet conditions.

Q: What does it cover?

A: It covers two laboratory loading methods (plates and beam bars), measurement and data‑treatment procedures for extrapolating short‑term test results to predict long‑term bending strain and relative ring deflection, and the required reporting elements for those tests.

Q: Who typically uses it?

A: Materials testing laboratories, GRP pipe manufacturers, design engineers, procurement/specification writers and conformity assessment bodies use this standard for product development, design verification and compliance testing.

Q: Is it current or superseded?

A: ISO 10471:2025 is the current edition (Edition 3), published in August 2025 and replacing the previous ISO 10471:2018 edition. National catalogues record approval/issue dates in late August 2025.

Q: Is it part of a series?

A: Yes — ISO 10471 is part of the body of ISO standards covering GRP piping systems and related test/installation standards (for example ISO 10467, ISO 25780) and is maintained under ISO/TC 138/SC 6 (Plastics piping systems). It is often used together with more general structural/reliability guidance such as ISO 2394.

Q: What are the key keywords?

A: GRP, glass‑reinforced thermosetting plastics, pipes, bending strain, ring deflection, wet conditions, creep extrapolation, plate loading, beam‑bar loading, ISO 10471.