Bunker C fuel oil, also known as No. 6 fuel oil, residual fuel oil, or heavy fuel oil HFO, is a high-viscosity petroleum product used in marine engines, power generation, and industrial boilers. Composed of complex hydrocarbons, Bunker C fuel oil delivers high energy content for combustion applications. When evaluating compatibility with O-rings, rubber seals, gaskets, and plastic components, material resistance to heavy hydrocarbons is essential to prevent swelling or degradation. Proper storage, handling, and PPE use help ensure safe operation and long-term rubber performance.

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