I recently made an Glass Cabinet with 6mm tempered Glass.

4 feet wide and 6 feet tall.

Each glass shelves is also 6mm tempered Glass.

I noticed the glass sag/bend in the middle like 0.1mm? I placed a known straight steel bar and when i push the bottom part of the glass upwards in the center, the gap closes.
Do i need to replace the shelves with thicker 8mm Glass, to prevent sag/bend in the middle?




Attached thumbnail(s)

Tempered glass sag/bend

I uploaded a video on YOUTUBE.

This post has been edited by StuartLee2015: Sep 10 2024, 10:46 PM

This might sound stupid, but what happens if you flip it over? Will it have a 0.1mm bump instead?

Also a tempered glass (the normal ones inside refrigerators at least) can hold max 30LB+, that is 13KG+ if you're afraid it won't hold.

I tried flip it over. it still flex/sag/bend.

Seeing as IKEA's UTRUSTA is also 6mm thickness, seems like it is an already suitable thickness.
As for changing it to 8mm, I think having a support at the bottom to prevent sagging and add additional strength seems to be better.

Good luck TS.