ISO 178-2010 Plastic-Determination of flexural properties
1. Scope
1.1 This International Standard specifies a method for determining the flexural properties of rigid and semi-rigid plastics under defined conditions. A standard test specimen is defined, but parameters are included for alternative specimen sizes for use where appropriate. A range of test speeds is included.
1.2 The method is used to investiqate 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).
1.3 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.
2. Atmosphere for conditioning and testingThe test specimens shall be conditioned as specified in the standard for the material being tested. In the absence of this information, select the most appropriate conditions from ISO 291. unless otherwise agreed upon by the interested parties, e.g. for testing at high or low temperatures.
The preferred set of conditions in ISO 291 is standard atmosphere 23/50. except when the flexural properties of the material are known to be nsensitive to moisture, in which case humidity control is unnecessary.
