ISO 527-2:2025
(Main)Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and extrusion plastics
Plastics — Determination of tensile properties — Part 2: Test conditions for moulding and extrusion plastics
1.1 This document specifies the test conditions for determining the tensile properties of moulding and extrusion plastics, based upon the general principles given in ISO 527-1. 1.2 The methods are selectively suitable for use with the following range of materials in the preferred thickness, or, in case of specimen machined from moulded parts in the thickness as moulded: — rigid and semi-rigid thermoplastics moulding, extrusion and cast materials, including compounds filled and reinforced by, for example, short fibres, small rods, plates or granules but excluding textile fibres (see ISO 527-4 and ISO 527-5). NOTE See ISO 527-1:2019, Clause 3 for the definition of "rigid" and "semi-rigid". — rigid and semi-rigid thermosetting moulding and cast materials, including filled and reinforced compounds but excluding textile fibres as reinforcement (see ISO 527-4 and ISO 527-5); — thermotropic liquid crystal polymers. The methods are not normally suitable for use with rigid cellular materials or sandwich structures containing cellular material. For rigid cellular materials, see ISO 1926. The methods are not suitable for flexible films and sheets, of thickness smaller than 1 mm, see ISO 527-3. 1.3 The methods are applied using specimens which can be either moulded to the chosen dimensions or machined, cut or punched from injection‑ or compression‑moulded plates. The multipurpose test specimen is preferred (see ISO 20753).
Plastiques — Détermination des propriétés en traction — Partie 2: Conditions d'essai des plastiques pour moulage et extrusion
L'ISO 527-2:2012 spécifie les conditions d'essai pour la détermination des propriétés en traction des plastiques destinés au moulage et à l'extrusion, basées sur les principes généraux établis dans l'ISO 527‑1.
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Standards Content (Sample)
International
Standard
ISO 527-2
Third edition
Plastics — Determination of tensile
2025-06
properties —
Part 2:
Test conditions for moulding and
extrusion plastics
Plastiques — Détermination des propriétés en traction —
Partie 2: Conditions d'essai des plastiques pour moulage et
extrusion
Reference number
© ISO 2025
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Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Principle and methods . . 2
5 Apparatus . 2
5.1 General .2
5.2 Extensometer .2
5.3 Recording of data .2
6 Test specimens . 2
6.1 Shape and dimensions .2
6.2 Preparation of test specimens .3
6.3 Gauge marks .4
6.4 Checking the test specimens .4
6.5 Anisotropy .4
7 Number of test specimens . 4
8 Conditioning . 4
9 Procedure . 4
10 Calculation and expression of results . 4
11 Precision . 4
12 Test report . 5
Annex A (normative) Small specimens . 6
Annex B (informative) Precision statement . 8
Bibliography .11
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO's adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical
behavior, in collaboration with the European Committee for Standardization (CEN) Technical Committee
CEN/TC 249, Plastics, in accordance with the Agreement on technical cooperation between ISO and CEN
(Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 527-2:2012), which has been technically
revised.
The main changes are as follows:
— Figure 1 and Table 1 have been moved from Clause 11 to subclause 6.1;
— former subclause 6.6, Number of test specimens, has been renumbered as Clause 7 to align with
ISO 527-1:2019;
— the reference to ISO 3167 has been replaced with ISO 20753;
— test specimens 1A and 1B have been replaced by test specimen A1 and A2 according to ISO 20753;
— small test specimen in Annex A, Type 1BA and 1BB have been replaced by reduced scale specimen, as
specified in ISO 20753.
A list of all parts in the ISO 527 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
International Standard ISO 527-2:2025(en)
Plastics — Determination of tensile properties —
Part 2:
Test conditions for moulding and extrusion plastics
1 Scope
1.1 This document specifies the test conditions for determining the tensile properties of moulding and
extrusion plastics, based upon the general principles given in ISO 527-1.
1.2 The methods are selectively suitable for use with the following range of materials in the preferred
thickness, or, in case of specimen machined from moulded parts in the thickness as moulded:
— rigid and semi-rigid thermoplastics moulding, extrusion and cast materials, including compounds filled
and reinforced by, for example, short fibres, small rods, plates or granules but excluding textile fibres
(see ISO 527-4 and ISO 527-5).
NOTE See ISO 527-1:2019, Clause 3 for the definition of "rigid" and "semi-rigid".
— rigid and semi-rigid thermosetting moulding and cast materials, including filled and reinforced
compounds but excluding textile fibres as reinforcement (see ISO 527-4 and ISO 527-5);
— thermotropic liquid crystal polymers.
The methods are not normally suitable for use with rigid cellular materials or sandwich structures
containing cellular material. For rigid cellular materials, see ISO 1926.
The methods are not suitable for flexible films and sheets, of thickness smaller than 1 mm, see ISO 527-3.
1.3 The methods are applied using specimens which can be either moulded to the chosen dimensions or
machined, cut or punched from injection- or compression-moulded plates. The multipurpose test specimen
is preferred (see ISO 20753).
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements 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 293, Plastics — Compression moulding of test specimens of thermoplastic materials
ISO 294-1, Plastics — Injection moulding of test specimens of thermoplastic materials — Part 1: General
principles, and moulding of multipurpose and bar test specimens
ISO 295, Plastics — Compression moulding of test specimens of thermosetting materials
ISO 527-1:2019, Plastics — Determination of tensile properties — Part 1: General principles
ISO 2818, Plastics — Preparation of test specimens by machining
ISO 10724-1, Plastics — Injection moulding of test specimens of thermosetting powder moulding compounds
(PMCs) — Part 1: General principles and moulding of multipurpose test specimens
ISO 20753, Plastics — Test specimens
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 527-1 apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .electropedia .org/
4 Principle and methods
The principle and methods shall be in accordance with ISO 527-1:2019, Clause 4.
5 Apparatus
5.1 General
The apparatus shall be in accordance with ISO 527-1:2019, Clause 5, specifically 5.1.1 to 5.1.4.
5.2 Extensometer
The extensometer shall be in accordance with ISO 527-1:2019, 5.1.5.
For this document, a gauge length of 75 mm is preferred when a test specimen Type A1 of ISO 20753 is used.
A gauge length of 50 mm is also acceptable for quality-control purposes or where specified.
If strains are recorded only on one side of the test specimen, ensure that low strains are not falsified by
bending, which may result from even faint misalignment and initial warpage of the test specimen and which
generates strain differences between opposite surfaces of the test specimen.
Increasing the gauge length leads to higher accuracy, especially for the modulus determination. The absolute
accuracy of the measurement of elongation required for a ±1 % accuracy of modulus determination is
±1,5 µm. This is less severe than the ±1 µm needed if a gauge length of 50 mm is used. Furthermore, necking
outside of the gauge length will be less frequent.
5.3 Recording of data
See ISO 527-1:2019, 5.1.6.
NOTE For the determination of the tensile modulus under the conditions v = 1 mm/min, L = 75 mm, L = 115 mm
-1
and r = 0,000 5 mm, the recording frequency for the strain signal greater than or equal to 22 s is appropriate
according to ISO 527-1:2019, Formula (1). This frequency increases as the gauge length increases. With larger gauge
length the absolute elongation measured by the extensometer is larger for the same crosshead displacement, i.e. the
recording instrument will see more data points in the same time span.
6 Test specimens
6.1 Shape and dimensions
Wherever possib
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