Orton Pyrometric Cone: 1 – Large – Pair

Description

Large Cones: require mounting in a commercial cone plaque,

Clay pat or wire cone holder before use. Mounting height

and angle is critical for consistent results.

Separating Cone Pairs:

Cones are formed in pairs and can be separated by

grasping the base and gently twisting along parting line.

Use Of Cones:

Cones are used to witness the heat work applied to ceramic ware

by a kiln. Common practice is to use multiple sets of three,

consecutively numbered cones placed strategically throughout the

ware setting to cover a wide temperature range. The first cone

in the series is called the Guide cone, the second is the Firing cone,

and the last is the Guard cone. A cone will bend when it is heated

to within a time and temperature heating profile. A bending difference

 of one cone or less throughout a kiln indicates good firing practice.

Interpretation of the cones bending point is of considerable aid for

making improvements to firing conditions and checking the

repeatability and uniformity of a kiln.

Cone No.	60°C	150°C
1	1136	1154