This article is considered accurate for the current version (1.63) of Foxhole.
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Resource used for building advanced structures and producing special items.
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— In-game description
Refined Materials (also known asrmats) are a type of production material used in the production of heavy vehicles, and equipment, such as combat vehicles.
It stacks up to 100 per slot in inventories. It can be stored in the stockpiles of Bases (32k max). It can be crated (need stack of 20 per crate) and uncrated with the right click context menu while interfacing a Seaport, Storage Depot, Aircraft Depot, or Shipping Container. Crates of Refined Materials created that way are not reservable. Crates of Refined Materials can be directly submitted to any item stockpile that accepts that item to transfer their content. The crates can also be stored in the crate stockpiles of Storage Depot/Seaport/Aircraft Depot (1000 public, 300 per Reserve Stockpile), Shipping Containers (60), or Storage Ships (1000). It can be transported by almost any vehicle with inventory slots, but is most commonly transported by Trucks. For long distances, it is much more efficient to transport it in bulk amounts as crates with shipping vehicles carrying Shipping Containers and submit them to a crate stockpile.
The weight of refined materials carried by a soldier can be reduced by 25% by wearing an Engineer Uniform.
Tactics
Due to its slow refining speed, it is important to always think ahead and refine a bunch of them before you need them, as it can take hours for the required refined materials to finish refining
If you want to privately store crates of refined materials for later, always remember to retrieve the materials as crates using the right click context menu
Refined materials have no direct use on the frontlines, and should never be transport there