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An ultra-high sensitivity penetrant (Level 4), ZL-56 fluorescent water-washable penetrant is safe for use on alloys in engineering and aerospace use, including aluminum, steel, nickel and titanium. ZL-56 is designed for non-porous and highly machined components. Developers recommended are ZP-4D powder, ZP-9F non-aqueous, SKD-S2 non-aqueous and ZP-5B water suspendible.
ZL-56 is listed on the QPL SAE AMS 2644 Qualified Product List.
NDT TypeFluorescent Penetrant Testing
Penetrant TypeType 1
Fluorescent Penetrant SensitivityLevel 4 - Ultra-High Sensitivity
Penetrant MethodsMethod A, Method C
Removal TypeWater Washable
Required EquipmentUV light source
Ideal ApplicationAerospace alloys, Aluminum, Critical components, High-stress parts, Nickel, Non-porous surfaces, Smooth, machined surface finish, Steel, Titanium
Defect ExamplesFinished surface cracks, Scratches
StandardsAECL, AMS 2644, ASME, ASTM E1417, Boeing BAC 5423 PSD 6-46 or 8-4, Boeing PS-21202, NAVSEA T9074-AS-GIB-010/271, QPL SAE AMS 2644
Dry powder developer for Form a penetrant testing and QPL SAE AMS 2644 approved.
Water suspendible developer for Form c penetrant testing, QPL SAE AMS 2644
Solvent-based developer for Type 1 Form d or Type 2 Form e penetrant testing, QPL SAE AMS 2644
Portable, handheld LED UV lamp for black light inspection during fluorescent PT or MT testing
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