Infra Block is a resource that can be obtained through Crafting, Salvaging, or Trading.
"Basic construction component, used to assemble simple facilities."
Infra Blocks are used mostly in building Doors and Facilities and are a component of Tech Blocks and Energy Blocks
Infra Blocks can be crafted from Steel Plates and Electronic Components inside an Assembler
Infra Blocks can also be extracted from Infra Scrap via the Recycler