ISO 178
Plastics -- Determination of flexural properties


ISO 178 specifies test procedures for determining the flexural properties of rigid and semi-rigid plastics, including flexural modulus and flexural strength. Applicable to thermoplastic, thermoset, and composite materials, the standard employs a three-point bending method where rectangular specimens are loaded until fracture or a specified deformation is achieved. This test provides critical mechanical data for evaluating polymer behavior under bending stress, supporting material selection and qualification in structural applications.


ISO 178 standard webpage
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