Glass is recycleable to infinity. The greatest issue that used to exist was the colourants added to tint the glass. Nowadays, to my knowledge, with enough temperature and chemical correction the tint can be removed. Even windshields can be recycled nowadays; no plastic survives after being put to a kiln thousands of degrees hot.

Plastics can be reused. Even if we start with PEHD, crushed, melt it down, and the end plastic is of lesser quality, the biggest problem is finding a new use for that weaker material.