Glass is a brittle material, and it is not expected to fail from fatigue. To test this possibility, a borosilicate glass (i.e. low coefficient of thermal expansion) coffee was selected. The coffee pot bottom was scratched using a wet scrubbing pad It was then thermal “shocked” by heating it to 160° C and plunged into 10° C water. This was done numerous times till a crack was visible. One coffee pot failed after 55 cycles. Please see the photographs below.
![](https://readconsulting.com/wp-content/uploads/2020/04/IMG_8627-copy-300x225.jpg)
![](https://readconsulting.com/wp-content/uploads/2020/04/IMG_8595-copy-300x225.jpg)
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![Proof of Fatigue in Glass](https://readconsulting.com/wp-content/uploads/2020/04/IMG_8618-copy-300x225.jpg)