There are currently nine different types of crafting resources that can be found in loot crates and machines, or obtained through recycling weapons, attachments, binoculars, and vision modules. When the March 2020 update brought in crafting, the only crafting resources were: Adhesive, Plastic, Rubber, Steel, Textile, and Thread. After the FNIX Rising Update (June 2020), three more materials were added: Aluminum, Titanium, and Tungsten.
There are two categories of resources. common and rare. Common resources are obtained through a multitude of ways. Looting crates, recycling, or looting machines. Tanks and Harvesters tend to drop more resources. Rare resources such as Aluminum and Titanium are harder to obtain as they can only be obtained by looting higher class machines (FNIX and Apocalypse class) or recycling items of three crown rarity or higher and vision modules. Tungsten however, can only be obtained from Apocalypse class machines.