I have not clock-checked that. But it does not seem to. In the use of such heat diffusers, the cook should be very careful in the lifting or moving of the pot when a very hot copper plate is sitting loose on the burner grate. She cannot let it fall down off its perch. On her foot, on the floor etc.. Heat diffusers should not be used in homes where there are children. If there is an option to use back burners, that would be more safe.