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Norm

ÖNORM EN ISO 178

Issue date: 2019 08 01

Plastics - Determination of flexural properties (ISO 178:2019)

This document specifies a method for determining the flexural properties of rigid and semi-rigid plastics under defined conditions. A preferred test specimen is defined, ...
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Publisher:
Austrian Standards International
Format:
Digital | 33 Pages
Language:
German | English | Download GER/ENG
Optionally co-design standards:
This document specifies a method for determining the flexural properties of rigid and semi-rigid plastics under defined conditions. A preferred test specimen is defined, but parameters are included for alternative specimen sizes for use where appropriate. A range of test speeds is included. The method is used to investigate the flexural behaviour of the test specimens and to determine the flexural strength, flexural modulus and other aspects of the flexural stress/strain relationship under the conditions defined. It applies to a freely supported beam, loaded at midspan (three-point loading test). The method is suitable for use with the following range of materials: — thermoplastic moulding, extrusion and casting materials, including filled and reinforced compounds in addition to unfilled types; rigid thermoplastics sheets; — thermosetting moulding materials, including filled and reinforced compounds; thermosetting sheets. In agreement with ISO 10350-1 and ISO 10350-2, this document applies to fibre-reinforced compounds with fibre lengths less than or equal to 7,5 mm prior to processing. For long-fibre-reinforced materials (laminates) with fibre lengths >7,5 mm, see ISO 14125. The method is not normally suitable for use with rigid cellular materials or sandwich structures containing cellular material. In such cases, ISO 1209-1 and/or ISO 1209-2 can be used. The method is performed using specimens which can be either moulded to the specified dimensions, machined from the central section of a standard multipurpose test specimen (see ISO 20753) or machined from finished or semi-finished products, such as mouldings, laminates, or extruded or cast sheet. The method specifies the preferred dimensions for the test specimen. Tests which are carried out on specimens of different dimensions, or on specimens which are prepared under different conditions, can produce results which are not comparable. Other factors, such as the test speed and the conditioning of the specimens, can also influence the results. The method is not suitable for the determination of design parameters but can be used in materials testing and as a quality control test.
ÖNORM EN ISO 178
2019 08 01
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ÖNORM EN ISO 178
2013 09 15
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ÖNORM EN ISO 178
2011 03 15
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ÖNORM EN ISO 178
2005 05 01
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2003 06 01
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Issue date : 2019 04 01
Plastics — Determination of flexural properties
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ISO 7500-1:2018
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ISO 16012:2015
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Issue date : 2018 10 19
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