Compressed Iron is a crafting ingredient used to make Rocket Launch Pads, a Buggy Seat, a Buggy Storage Box, or a Frequency Module. It is made by placing two Iron Ingots into a Compressor. It can also be placed back into the Compressor along with coal to make Compressed Steel.
Crafted using a Compressor
Note: from Galacticraft 3.0.9, if Quick Mode is enabled this recipe will produce 2 Compressed Iron.