ISO 1209-2:2007

Rigid cellular plastics - Determination of flexural properties - Part 2: Determination of flexural strength and apparent flexural modulus of elasticity

ISO 1209-2:2007 specifies a method for determining the flexural strength and the apparent flexural modulus of elasticity of rigid cellular plastics.

Plastiques alvéolaires rigides — Détermination des propriétés de flexion — Partie 2: Détermination de la résistance à la flexion et du module apparent d'élasticité en flexion

General Information

• Status: Published
• Publication Date: 03-May-2007
• ICS: 83.100 - Cellular materials
• Technical Committee: ISO/TC 61/SC 10 - Cellular plastics
• Drafting Committee: ISO/TC 61/SC 10/WG 11 - Physical and chemical properties
• Current Stage: 9093 - International Standard confirmed
• Start Date: 24-Sep-2021
• Completion Date: 13-Dec-2025

Relations

• Revises: ISO 1209-2:2004 - Rigid cellular plastics - Determination of flexural properties - Part 2: Determination of flexural strength and apparent flexural modulus of elasticity
• Effective Date: 15-Apr-2008

Overview

ISO 1209-2:2007 specifies a standardized laboratory method to determine the flexural strength and the apparent flexural modulus of elasticity of rigid cellular plastics using a three‑point bending arrangement. The standard describes the test principle, required apparatus, specimen preparation and conditioning, the test procedure, calculation of results, precision data and the mandatory contents of a test report. Keywords: ISO 1209-2:2007, rigid cellular plastics, flexural strength, apparent flexural modulus, three‑point bending, materials testing.

Key topics and technical requirements

• Test principle: A centrally applied load is imposed on a rectangular specimen supported at two parallel cylindrical edges; force–deformation is recorded and used to derive flexural strength and modulus.
• Apparatus: Universal testing machine with simultaneous force and deflection recording and load measurement accuracy of ±1%. Support and loading edges are cylindrical with an edge radius of (15 ± 1) mm; span is adjustable (200–450 mm) with a recommended span of 300 mm.
• Specimen geometry: Specimens are rectangular parallelepipeds. The standard prescribes relationships between specimen thickness, width and span (span generally selected in relation to specimen thickness). Specimens must be cut without deforming the cell structure; skins/facings, if present, must be recorded.
• Number of specimens: At least five specimens per sample. For anisotropic materials and single‑skin samples, duplicate sets (different orientations or skin in tension/compression) are required and reported separately.
• Conditioning and test environment: Condition specimens for a minimum of 6 hours under the chosen test conditions. Normal conditions cited include (23 ± 2) °C, (50 ± 10) % RH; the standard also lists alternative temperatures for end‑use simulation.
• Test procedure and speeds: Load applied at a constant head movement. Recommended speeds include (20 ± 1) mm/min for modulus determination and either (20 ± 1) mm/min or (100 ± 10) mm/min for other flexural properties. Tests are normally not continued beyond 5% flexural strain.
• Results: The standard gives formulae for calculating flexural strength and apparent flexural modulus from the recorded force‑deflection curve and specifies reporting and precision requirements.

Applications and users

ISO 1209-2:2007 is used for:

• Quality control and acceptance testing of rigid cellular plastics (e.g., insulation panels, foam structural components).
• Material specification, comparison and R&D for foam manufacturers and converters.
• Certification and performance verification by independent test laboratories. Primary users: materials engineers, product developers, QA managers, independent testing laboratories and standards/specification writers.

Related standards

• ISO 1209-1 (Basic bending test) - part of the same series on flexural properties.
• ISO 1923 - for determination of linear dimensions of cellular plastics (referenced for specimen measurement).
• ISO 5725 - referenced historically for precision assessment (see standard for current precision guidance).

For full equations, detailed specimen dimensions and mandatory reporting items, consult the official ISO 1209-2:2007 document.

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 1209-2
Third edition
2007-05-01
Rigid cellular plastics — Determination of
flexural properties —
Part 2:
Determination of flexural strength and
apparent flexural modulus of elasticity
Plastiques alvéolaires rigides — Détermination des propriétés de
flexion —
Partie 2: Détermination de la résistance à la flexion et du module
apparent d'élasticité en flexion

Reference number
©
ISO 2007
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©
ii ISO 2007 – All rights reserved

Contents Page
1 Scope . 1
2 Normative references . 1
3 Principle . 1
4 Apparatus . 1
5 Test specimens . 2
6 Conditioning and test conditions . 3
7 Procedure . 3
8 Expression of results . 4
9 Precision . 5
10 Test report . 5
©
ISO 2007 – All rights reserved iii

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 1209-2 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular plastics.
This third edition cancels and replaces the second edition (ISO 1209-2:2004), which has been technically
revised.
ISO 1209 consists of the following parts, under the general title Rigid cellular plastics — Determination of
flexural properties:
— Part 1: Basic bending test
— Part 2: Determination of flexural strength and apparent flexural modulus of elasticity
©
iv ISO 2007 – All rights reserved

INTERNATIONAL STANDARD ISO 1209-2:2007(E)
Rigid cellular plastics — Determination of flexural properties —
Part 2:
Determination of flexural strength and apparent flexural
modulus of elasticity
1Scope
This part of ISO 1209 specifies a method for determining the flexural strength and the apparent flexural
modulus of elasticity of rigid cellular plastics.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
ISO 1923, Cellular plastics and rubbers — Determination of linear dimensions
3 Principle
A load is applied at a uniform rate by means of a loading edge to a test specimen supported at two positions.
The load is applied perpendicularly to the specimen at a position midway between the supporting positions
(see Figure 1). The load/deformation curve is recorded. From the curve, the flexural strength and the apparent
flexural modulus of elasticity are calculated.
4 Apparatus
4.1 Test machine, consisting of a universal mechanical-testing machine capable of operating at a constant
rate of movement of the moveable head.
The range of the test machine shall be such that the applied load can be measured with an accuracy of ±1%.
The machine shall include a device for simultaneous recording of force and the corresponding deformation.
4.2 Test spe
...