Flexural Strength With Engineered Porosity ASTM C1674

Flexural Strength With Engineered Porosity ASTM C1674

The test method in ASTM C1674 determines the flexural strength (defined as modulus of rupture in bending) of engineered ceramic specimen components with two-dimensional multiple longitudinal hollow honeycomb-like channel architectures. Data obtained are used in product characterization and quality control of end use products.


    The experimental data collected in ASTM C1674 can be utilized for product characterization, material and structural development, quality control, design data, and production/engineering specifications. Ceramics with honeycomb structures can be used as catalytic converters, combustion burner plates, high temperature filters, energy absorbers and dampers. The components produced can have varieties of geometries like cylinders, rings, rods, plates, and blocks.

    Test Procedure:

    The test method in ASTM C1674 uses honeycomb structured specimens with a wide range of shapes, architecture, porosity size, pitch, crush strength, and shear strength; so a single fixed geometry is not possible for flexure testing. Instead, considering the given cell size, mechanical properties, composition, and specimen limitations, a defined geometry is taken as reference with either four-point or three-point flexure testing geometries in Test A. Four-point flexures are strongly preferential for characterization and testing purposes. Test B in ASTM C1674 is recommended for cordierite and silicon carbide test specimens. These bear small cell sizes (~ 2 mm). It provides a referential baseline specimen size with advantages of reproducibility, experimental repeatability, and comparability.

    Sample size:

    The components described in ASTM C1674 in general have almost 30% porosity, bearing honeycomb cross-sectional channels of the order of 1 mm or greater. The test method is basically carried out for ceramic materials which are linear-elastic when failure is recorded with respect to the applied tension.


    The values stated in ASTM C1674 are standardised by SI units. While in some places, English units are used for product definitions and tool descriptions in accordance with the cited references and as commonly referred in the US automotive industries. 


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