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

Penetrant - mechanical, electrical or structural

A biochemical penetrant is a chemical that increases the ability of a poison to apply its toxic effect to a living organism Penetrants, or penetrating items, are the mechanical electrical or structural items that pass through an opening in a wall or floor such as pipes, electrical Penetrating oil or penetrating fluid is very low- Viscosity Oil. Dye penetrant inspection ( DPI) also called liquid penetrant inspection ( LPI) is a widely applied and low-cost inspection method used to locate Penetrants, or penetrating items, are the mechanical electrical or structural items that pass through an opening in a wall or floor such as pipes, electrical

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