Pyrometric cones are used to determine the combined effect of temperature and time, usually called Heat work in the firing of ceramic wares. The physical and chemical changes in the cones resulting in deformation are similar to those taking place in the ware being fired. This phenomenon is an important factor contributing to the usefulness of pyrometric cones for the following purposes :To indicate the progress of firing, as the products approach maturity through the use of series of cones mounted to a suitable plaque and observed during firing,To determine by observation of the cones, the end point of firing i.e. when full maturity of the product is reached,To determine by observation of the cones, the end point of firing i.e. when full maturity of the product is reached,To provide evidence of adverse atmospheric conditions during firing, as indicated by the color and or temperature of the cone surfaces after firing

Pyrometric cones are used to determine the combined effect of temperature and time, usually called Heat work in the firing of ceramic wares. The physical and chemical changes in the cones resulting in deformation are similar to those taking place in the ware being fired. This phenomenon is an important factor contributing to the usefulness of pyrometric cones for the following purposes :To indicate the progress of firing, as the products approach maturity through the use of series of cones mounted to a suitable plaque and observed during firing,To determine by observation of the cones, the end point of firing i.e. when full maturity of the product is reached,To determine by observation of the cones, the end point of firing i.e. when full maturity of the product is reached,To provide evidence of adverse atmospheric conditions during firing, as indicated by the color and or temperature of the cone surfaces after firing