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Thermal cracking. In thermal cracking, high temperatures (typically in the range of 450Â°C to 750Â°C) and pressures (up to about 70 atmospheres) are used to break the large hydrocarbons into smaller ones. Thermal cracking gives mixtures of products containing high proportions of hydrocarbons with double bonds - alkenes.
The cracking of pottery caused by stress during the firing and cooling process. During the firing, clay goes through what is called a silica inversion at slightly over 400 F and again at slightly over 1000 F. This transformation puts a lot of stress of the clay.