Dye Penetrant Testing

Dye penetrant testing (PT) reveals surface-breaking cracks and porosity in non-porous materials, including non-magnetic metals. The range includes red visible and fluorescent penetrants, solvent-removable and water-washable types, developers, cleaners and removers, and high-temperature products.

Typical applications

• Weld inspection on stainless steel and aluminium
• Crack detection on castings, forgings and machined parts
• Maintenance inspection of non-magnetic components
• Fluorescent inspection under UV-A light

Choosing a system

Key factors are the visible or fluorescent method, how excess penetrant is removed (solvent or water), the sensitivity level your procedure requires, the surface temperature of the part, and keeping penetrant, cleaner and developer within one compatible system.

Need help choosing a system? Tell us the material, the method in your procedure and the working temperature and we’ll recommend suitable products.

Read our guide: How to choose a dye penetrant system.