1. Prepares test specimens that have been a slab of dry land as many as 15 pieces of clay. Perform three times for each combustion type of formula (5 pieces plates for each combustion). For combustion temperature data, record whenever the temperature rise time combustion increases and other necessary information.
3. Turn furnace accordance with the instructions operation, observe and record temperature rise in the combustion pyrometer through every 20 minutes by filling in the table 4.5. (Temperature practice). 4. Perform retaining temperature for 20 minutes. Combustion temperatures has reached the appropriate temperature PS. 08 is characterized by PS curling. 08 The and pyrometer pointing figures 955 º C. Then turn off the stove burning and let cool for at least 12 hours.
5. Take the test object that has burned from the furnace to temperature testing maturity clay. Perform the same thing to the test object other combustion corresponding PS. 06 and PS. 04.
a. Loud, shrill when a knock will
b. Solid, the pores are relatively small or nonexistent because filled with molten glass.
c. Water-resistant, does not absorb water so it can be used as a water container.
d. Fuel color, from light colors to dark colors, depending on the size of the content of impurities, particularly oxides of metals such as iron, manganese and titan.
e. Losses, as a result of changes in the physics and chemistry of clay minerals during combustion with the size of shrinkage depends on the type of clay used.