No doubt another example of Chinese engineering and testing practices. If it didn’t explode at, say, 200 degrees within ten seconds, they would decide that temperatures up to 200 degrees are fine.
This is not electroinics, but this is basically how all Chinese electronics are built and tested, BTW.
Years ago, I interviewed at a process controller manufacturer. I asked what the smudge marks were on the boxes, and was told they bang them with rubber mallets during testing.