Samsung's second-generation foldable phone was launched along with claims that the OEM had made some strides in keeping this form-factor clear of potentially destructive dust and debris. A new video by teardown specialists iFixit may have called this into question with a colorful experiment. It shows that fine dust is more than capable of finding its way into the device.
https://www.notebookcheck.net/The-Galaxy-Z-Flip-may-be-more-fragile-than-Samsung-would-like-you-to-think.454265.0.html