A Segment (SEG) consists of 3 pieces of information:
The Rate (rA)- The measurement of how fast or slow the temperature rises or falls at various points in the firing. This is programed degrees Fahrenheit or Celsius per hour.

The Temperature (°F) - This can be the peak temperature of the firing program, a point in the firing program that signals the rate to change, or that signals a hold or soaking period. This is entered in degrees Fahrenheit or Celsius.

Hold (Hld) - A “Hold” is a period of time in which the kiln remains at a specific temperature. This is often referred to as a soaking period. This is entered in Hours and Minutes. The digits to the left of the decimal represent hours and the digits to the right of the decimal represent minutes. Therefore 90 minutes can be represented by “01.30” or “00.90”.

A single program can consist of up to 8 segments. A segment can control the cooling as well as the heating of the kiln. It is important to remember that a segment that controls the cooling of the kiln can only slow the natural cooling rate of the kiln. It is possible to string two programs together to create a 16 segment program. See the 16 Segment Programs section for instructions.

In order to insure programming success it is very important to have a good understanding of heating glass and how your GlassMaster works to control the kiln. Please refer to the General Firing Guidelines section of the manual before programing the kiln