Water-Based Fluorescent Penetrant

ZL-425 is a water-based, water washable fluorescent penetrant used for finding indications in castings, forgings, extrusions and other materials with rough surfaces commonly found in automotive part applications. ZL-425 is an ideal solution when waste water produced during the inspection process is a concern for the operation. ZL-425 is water based and contains no petroleum distillates allowing it to drain directly into the sewage system depending on local regulations.

ZL-425 has been specifically developed for use within the automotive sector and can also be used in applications where traditional petroleum solvent-based penetrants may attack the surface, such as plastics. The penetrant features great rinse characteristics allowing it to be self-developing, so you may not need to use a separate developer depending on the application.

ZL-425 is designed to be environmentally sensitive while meeting industry approvals, including EN ISO 3452-2 and AMS 2644, and can be used in place of any conventional water-washable fluorescent penetrant.

This product is currently out of stock and unavailable.

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  • Reduce environmental footprint and waste-water pollutants
    • Reduce water treatment costs and discharge waste process water directly into the sewage system (depending on local regulations) due to minimal water-based contaminants.
    • Meet or exceed local discharge regulations with low Biochemical Oxygen Demand (BOD) and Chemical Oxygen Demand (COD) levels.
    • Support a healthy environment with waterbased penetrants that have minimal occupational health and safety impacts.
  • Reliably speed up inspection and wash processes
    • Identify bright indications with superior sensitivity and low fluorescent background interference.
    • Increase throughput and reduce costs by eliminating the developer step of inspection processes depending on procedures and requirements.
    • Rapid rinse and post inspection washing of parts thanks to excellent washability properties, due to trade secret chemistry.
  • Level 1, low sensitivity
  • Hydrocarbon-free
  • Biodegradable
  • Excellent water wash removability
  • Developer is not required
  • NDT Type: Fluorescent Penetrant Testing
  • Penetrant Type: Type 1
  • Fluorescent Penetrant Sensitivity: Level 1 – Low Sensitivity
  • Penetrant Methods: Method A
  • Removal Type: Water Washable
  • Required Equipment: UV light source
  • Ideal Application: Automotive, Ceramic components, Leak detection, Plastic components
  • Defect Examples: Cracks, Leaks

Standards: ASME BPVC, ASTM E1417/E1417M, ASTM E165/E165M-18, ISO 3452-2, NAVSEA T9074-AS-GIB-010/271, QPL SAE AMS 2644

Additional information


25 Litres, 200 Litres, 1000 Litres