Fuel oils, gasoline, and other organic compounds may permeate which type of piping?

The correct answer is plastic, as certain types of plastic piping, especially those made from materials like polyvinyl chloride (PVC) or polyethylene, are known to be permeable to various organic compounds, including fuel oils and gasoline. This permeability allows these substances to seep through the material, which can lead to contamination of the surrounding soil or groundwater.

Factors such as the molecular structure of the organic compounds and the characteristics of the plastic itself, such as density and thickness, can contribute to this permeation issue. Additionally, when exposed to hydrocarbons, some plastics can degrade or lose their structural integrity over time, making them less suitable for applications involving organic solvents and fuels.

In contrast, steel, concrete, and copper typically offer greater resistance to permeation by these compounds. Steel is less prone to chemical degradation, while concrete is an inorganic material that usually does not allow for significant seepage of hydrocarbons. Copper also has excellent durability and resistance to corrosion, making it a less likely candidate for permeation by organic compounds.