1.1 This International Standard specifies a method for determining the flexural properties of rigid (see 3.12) 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 investigate the flexural behaviour [1] of the test specimens and for determining 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:
thermoplastics moulding and extrusion 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 International Standard applies to fibre-reinforced
compounds with fibre lengths u 7,5 mm prior to processing. For long-fibre-reinforced materials (laminates) with
fibre lengths > 7,5 mm, see reference [2] in the bibliography.
The method is not normally suitable for use with rigid cellular materials and sandwich structures containing cellular
material [3, 4].
NOTE For certain types of textile-fibre-reinforced plastics, a four-point bending test is preferred. It is described in
reference [2].
1.4 The method is performed using specimens which may be moulded to the specified dimensions, machined
from the central portion of a standard multipurpose test specimen (see ISO 3167) or machined from finished or
semi-finished products such as mouldings, or extruded or cast sheet.
1.5 The method specifies preferred dimensions for the test specimen. Tests which are carried out on specimens
of different dimensi (...abbreviated)
Diese Norm legt ein Verfahren zur Ermittlung der Biegeeigenschaften von Kunststoffen unter definierten Bedingungen fest. Es ist ein genormter Probekörper festgelegt, jedoch sind die Parameter für andere Probekörper, falls angemessen, enthalten. Das Verfahren wird für die Untersuchung des Biegeverhaltens der Probekörper und für die Bestimmung der Biegefestigkeit, des Biegemoduls und anderer Gesichtspunkte der Spannungs-Dehnungs-Beziehung unter den definierten Bedingungen der Biegebeanspruchung verwendet. Es wendet einen frei unterstützten Balken an, der in der Mitte der Stützweite belastet wird (Dreipunktversuch).