From the items made directly with Glass (Glass Flask, The Glasser, high-tier Alchemist's Benches, decorations), some can be dismantled and give you a small amount of Glass in return (together with a few other resources), while others cannot be dismantled at all or won't give you any Glass. The only items that can be dismantled and give you some Glass back are The Glasser, Wall Lantern, Wine Basket, Wine Rack, and Wine Shelf. To dismantle items, you'll need to use a Dismantling Bench.