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 […]
Glass Failure Analysis, Coffee Pot Failure
Read Consulting failure analysis laboratory was asked to examine a failed coffee pot that had been abraded with a cleaning pad and then subjected to a series of thermal shock cycles. The pot was heated to 190°C then immediately immersed in 10°C water. The pot appeared to survive till the 51st cycle. On this cycle […]
Coffee Pot Failure Analysis
A failure analysis was performed on a glass coffee press. In this case the glass coffee pot is a 0.085″ thick borosilicate glass 3.7″ diameter cylinder that is 7″ high. It had received a blow on the top rim, and it broke into approximately 10 pieces. Because the pot is a cylinder, the blow from […]
Failure Analysis: “Exploding” Coffee Pot
California failure analysis expert was presented with the claim that a coffee pot had “exploded” when replaced on the coffee warmer in a convenience store.First of all, there is no “stored” energy to cause an explosion. The coffee is not under pressure, and the pot is made from annealed borosilicate glass. In addition, the broken […]