Refractory Testing (RUL/CIC, HMOR)

HMOR 422 D/3- Apparatus for testing MOR


Modulus of Rupture (MOR) of refreactrory ceramics up to 1500°C


The modulus of rupture (MOR) is an important variable in the characterization of refractory materials. Determination of the maximum load at high temperatures is a property which, along with other thermophysical properties, is an important parameter for quality control and development of furnace linings.

The modulus of rupture is defined as the maximum stress a rectangular test piece of specific dimensions can withstand in a 3-point bending test until it breaks, expressed in N/mm2 or MPa.


The International Standard Test Method is described in ISO 5013; test piece dimensions: 150 mm x 25 mm x 25 mm.

For determination of the modulus of rupture of refractories up to a temperature of 1500°C and a maximum load of 5000 N (60 N/mm2), NETZSCH offers the model 422 D/3. This model is designed for continuous testing with a 3-point bending device.
With optional devices for load and deformation measurement and/or constant deformation rate, additional information about the limits of elasticity and crack propagation in ceramic test pieces can be obtained.

Technical Specification:


Temperature range: RT to 1500°C (1450°C at HMOR 422 E/4)


Heating elements: SiC


Load: 1 N to 5000 N (2.0 to 12.5 N/s, switchable)


Bending measuring range: 10000 µm (2500 µm at 422 E/4)


Sample dimensions: 150 mm x 25 mm x 25 mm (45 mm x 4.5 mm x 3.5 mm at 422 E/4)

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