Glass is a LV-tier material, it is used to create Glass Tube, a crafting component for the first circuits. Its lens can be later used to engrave decorative blocks and create Central Processing Unit (Wafer). Glass can be shaped into arrow heads, filled with potions and used to create arrows. It is used to create Reinforced Glass from IndustrialCraft2 mod. Finally, Borosilicate Glass, a lategame binder, is made from it.
Due to the excessive bulk of including all GregTech 5 blocks and items this navigation box only holds ~10% of all. The reader can view This and This navigation boxes to access the rest.