BS EN 843-1Part 1: Determination of flexural strength of advanced technical ceramics_monolithic ceramics:
EN843-1 describes methods for determining the nominal flexural strength of advanced monolithic technical ceramic materials at ambient temperature. The available loading geometries are three- and four-point flexure, using rectangular section test pieces of two prescribed geometries: 20 mm support span (A) and 40 mm support span (B). The test prescribes four categories of surface finish applied to the test pieces: I: as-fired or annealed after machining; II: machined using agreed grinding procedures and material removal rates; III: standard finishing procedures: III.1: finishing by grinding; III.2: finishing by lapping/polishing.