Windows
Bulletproof Glass Plate Centered
Bulletproof Glass can be repaired but requires completely new blocks of the same type as repair material.
Crafting
Craft at Forge with 
Crucible · makes 1
Crafted as Bulletproof Glass Block: pick this one of its variants when you place it.
- Glass (forge units)× 112
- Stone (forge units)× 10
- Lead (forge units)× 40
- Iron (forge units)× 20
- Clay (forge units)× 20
Harvest drops
Broken Glass× 21
Taken apart with a harvesting tool (axe, pickaxe, shovel), before perks and tool bonuses.
Where to find (8 POIs)
Red Mesa Compound (tier 5), Shamway Factory (tier 5), Shotgun Messiah Factory (tier 5), ChemTech Distribution Center (tier 4), Joe's Junction (tier 4), Shotgun Messiah Range (tier 4), Doggos (tier 2), Cascade Tower.
Points of interest built with this block (any of its variants), the highest tiers first, from the game's prefab files.