Foreword

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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test specimens 1A and 1B have been replaced by test specimen A1 and A2 according to ISO 20753 ;
small test specimen in Annex A, Type 1BA and 1BB have been replaced by reduced scale specimen, as specified in ISO 20753 .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.

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

3 Terms and definitions

4 Principle and methods

5 Apparatus

5.1 General

5.2 Extensometer

5.3 Recording of data

6 Test specimens

6.1 Shape and dimensions

6.2 Preparation of test specimens

6.3 Gauge marks

6.4 Checking the test specimens

6.5 Anisotropy

7 Number of test specimens

8 Conditioning

9 Procedure

10 Calculation and expression of results

11 Precision

12 Test report

Bibliography

ISO 527-2:2025

Plastics. Determination of tensile properties — - Part 2: Test conditions for moulding and extrusion plastics

Current

Published:

18 Jun 2025