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Have you made the chemistry table? That should unlock rubber bar.
If you have already made it, try looking in the “suggested” tab of the crafting window for something the game thinks you still need to make.
I have seen something similar before, where it turned out the guy had found his iron plates rather than make them.
If you are not seeing gunpowder either then it seems like sulphur is the culprit. The only thing I can suggest is to try mining some sulphur to see if that triggers the unlock.