Pyrometric Cones    

Pyrometric cones are  slender pyramids made  from selective compositions,  calibrated to bend at different temperatures. Each cone is unique  in that it measures temperature  at a specific  temperature  and hence they are numbered.  Similar to heat rings, Pyrometric cones too,  measure the amount of  heat work and are useful to  monitor kiln performance.  As the cone nears its maturing temperature,  it softens and the tip begins to bend, drawn down by the influence of gravity. It typically takes about 20 minutes for the cone to bend fully. Higher cone number requires more temperature to bend (view temperature chart).  

These products change with heat work in a manner analogous to the fired product; and hence are good indicators of the amount of heat available to properly mature (sinter) the fired product. Cones are therefore considered more effective indicators of a completed firing cycle than a pyrometer as they depend on the combination of time and temperature, rather than temperature alone.

We assure consistant quality from batch as the raw materails are specailly manufactured at our facility. Moreover each batch of raw materail is made to pass through specialised quality control procedure based on wet chemical and spectroscopic techniques for major as well as trace elements. Further more rings from each and every batch are tested at differnet temperatures to ensure bending at specified temperature.

Reliability :

1. Over Pyrometer
Pyrometric cones are calibrated to bend at different temperatures – each cone number to represent a different amount of “heat work”. Cones are therefore considered more effective indicators of a completed firing cycle than a pyrometer as they depend on the combination of time and temperature, rather than temperature alone.


2. Over Electronic Controllers
It is still a very good idea to put cones in electronic controlled kilns. This ensures that there uniformity of temperature within and to make sure the kiln doesn't drift and continue to fire at the right temperature as the elements age.