Penetrant
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A penetrant is a substance that penetrates or assists some other material to penetrate another substance or object.

Penetrant can refer to:

• Penetrant (biochemical), a chemical that helps another chemical to invade a living organism in order to deliver a desired effect
• Penetrant (mechanical, electrical, or structural), penetrating items or services that pass through an opening in a fire-resistance rated wall or floor assembly, creating the need for a firestop
• Penetrating oil, a low-viscosity oil used to free rusted mechanical parts such as nuts and bolts
• Dye penetrant or liquid penetrant, a low surface tension fluid used with an inspection method to locate surface-breaking defects in non-porous materials

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Penetrant - mechanical, electrical or structural