Scope and field of application
This International Standard specifies a method for determining
the pyrometric cone equivalent (refractoriness) of siliceous, low
alumina fireclay and fireclay refractory materials and
Its useful range of application depends on the availability of
suitable pyrometric reference cones. In the temperature range from
1 500 to 1 800 °C, the pyrometric reference cones specified in
ISO/R 1146 are suitable.
Although pyrometric reference cones are primarily manufactured
for estimating the effect of temperature on siliceous, low alumina
fireclay and fireclay products with regard to their composition,
the method may also be used for determining the refractoriness of
other refractory materials and products, but the results may then
be not so precise.