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Falcon 9 Structure
Falcon 9 tanks are made of aluminum-lithium alloy, a material made stronger and lighter than aluminum by the addition of lithium. Inside the two stages are two large tanks each capped with an aluminum dome, which store liquid oxygen and rocket-grade kerosene (RP-1) engine propellants.
The tanks and domes are fabricated entirely in-house by SpaceX using SpaceX’s custom-made friction stir welders to execute the strongest and most reliable welding technique available. The structures are painted in-house by SpaceX.