Lot of 250 Orton Self Supporting Pyrometric Cones SSB06 SSB04 SRB6 SRB04 SRB05

Includes:

1 Box with 46 Orton Small Pyrometric Cones of SRB 6 ESF1

1 Box with 48 Orton Small Pyrometric Cones of SRB 04 RQG

1 Box with 54 Orton Small Pyrometric Cones of SRB 04 OMI

1 Box with 54 Orton Small Pyrometric Cones of SRB 05 OPI

1 Box with 23 Orton Self Supporting Pyrometric Cones of SSB 06 JHG

1 Box with 25 Orton Self Supporting Pyrometric Cones of SSB 04 OHI

ORTON PYROMETRIC CONES FOR CERAMIC ARTS

Pyrometric cones measure heat-work (the effect of time and temperature).

Orton Pyrometric cones are slender pyramids made from about 100 carefully controlled compositions. Each cone number is unique in measuring temperature within a small temperature range (less than 30°C). Cones measure the amount of heat absorbed. As the cone nears its maturing range, it softens and the tip begins to bend, drawn down by the influence of gravity.

The Large and Self-supporting cones are used to measure temperature uniformity and/or if there was sufficient heatwork done to mature the ware. Cones indicate whether the ware received an adequate amount of heatwork to properly mature the clay or glaze. A properly fired cone will bend over with the tip of the cone almost touching the shelf. After firing a kiln, a simple glance at the cone can tell if the firing was sucessful.

The small and bar cones are mainly used in the kiln shut-off device called the Kilnsitter. This is a mechanical device that shuts off the kiln when the temperature inside is sufficient to cause the cone to deform under the weight of the Kilnsitter rod.