Combustion clay into biscuits made to provide sturdiness early on objects and facilitate further work. However, sometimes burning biscuits made until at high temperatures as required. As a result of errors in the previous process will be looked after these objects complete the combustion process. Some things to note in the combustion process are:
- objects that will be glazed,
- burning appliance, and
- by burning.
These factors influence the result of combustion. Therefore, in implementation need to know:
- how to prepare raw objects, and
- heat setting fire / flame burning speeds or circulation.
a. Some Errors in Phase Combustion
Benda broken, cracked or even explode. This is due to:
1) Drying not perfect.
2) There is unevenness in the thickness of body weight.
3) There are air bubbles in body weight.
4) The burning too fast.
Countermeasures errors in the combustion stage can be done in the following way:
1) Make sure the soil preparation stage, especially at a time pengulian, really solid. Also at the time of establishment or the connection, make sure there are no air bubbles.
2) The walls / objects that are too thick body needs to be scraped / diluted.
3) Benda longer dried before being burned, then baked slowly (preheating) is rather long.
4) Strive burning objects slowly until it reaches a temperature of 200 o C and 600 o C.
b. The hole that appears on the surface (spit out)
Hole (spit out) that is caused by the presence of impurities / granular casts. This can be overcome by:
1) Keep / remove penguli table of plaster that has been damaged / obsolete or not good, so clay is not contaminated with other materials.
2) Use more clay that is filtered.