Stainless steels are corrosion-resistant, but they are not completely impervious to rusting. This makes such a dam impervious to surface or seepage erosion. Parking lots tend to be sources of water pollution because of their extensive impervious surfaces. This made the machine impervious to small arms fire and resistant to explosives. The styrene gives the plastic a shiny, impervious surface. Ricin is resistant, but not impervious, to digestion by peptidases. This makes the concrete stronger and more impervious to water penetration. Rock-fill dams are embankments of compacted free-draining granular earth with an impervious zone. Stryfe wears battle armor of unknown composition that is highly impervious to damage. Kensington locks are not designed to be an impervious protection measure. Fluoroether-based greases are quite impervious to organic solvents. Be and Mg are passivated by an impervious layer of oxide. His skin is replaced with gravel, making him impervious to pain and incredibly strong. Clark developed various superhuman abilities, such as incredible strength and impervious skin. The king's administration and law unified the realm, rendering him relatively impervious to papal condemnation.