|Monthly Tech-Tip |
A 3 inch by 3/16 thick tile is flamed and timed until it cracks. The crack usually is audible and sometimes spectacular (the tile flying apart). However if the body is heavily grogged the crack can grow slowly (often from the edge inward). We log the result using the TSFL test.
Thermal Shock Failure
A simple test any potter can do by making and firing square tiles and using a plumbing torch to see how long before they fracture.