Pyrometric cone

Seger cones ( unit symbol SK) test specimens for determining the fire resistance. They are after the ceramist Hermann Seger (1839-1893) named, who developed it in 1885 for his studies on the fire resistance of various materials. The standard cone from the material to be tested are beveled about 5 inches high and lightweight. Of the cone is then slowly heated in an oven. If the cone tip is completely inverted and touches the ground, the cone case temperature is determined. See the reference list of Seger cones is read:

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There are comparison cone according to ISO, Orton or HPC These can be converted to each other. In Germany the Seger cone was commonly used until 2005 - he was then no longer manufactured. In many areas, now the Orton cone is therefore used.

The pyrometric cone equivalent is for the fire resistance of a material not rich information - the expert he is but a pragmatic reference point, because it reflects the effect of temperature and time. More robust information gives, for example, hot compressive strength, thermal shock resistance, thermal expansion and other characteristics. For this reason, the use of Seger cones occurs more and more into the background.

Seger cones from a calibrated material with a defined point of fall are also used for temperature determination in kilns for ceramics and pottery. This can be determined during the firing of ceramic products as the maturing temperature. This use has fallen considerably since the availability of low-cost high-temperature thermometers. Meanwhile, temperature measurement rings are used (for example, Buller -rings) instead of the cone often. They react exactly like the cone and the ware on the effect of temperature and time in the oven. The shrinkage of the ring diameter is a measure of the temperature in the furnace.