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.


  • Level 1, low sensitivity
  • Hydrocarbon-free
  • Biodegradable
  • Excellent water wash removability
  • Developer is not required


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.

Ordering Information

25 litres056C217

200 litres056C218

1000 litres056C219

Product Properties

NDT TypeFluorescent Penetrant Testing

Penetrant TypeType 1

Fluorescent Penetrant SensitivityLevel 1 - Low Sensitivity

Penetrant MethodsMethod A

Removal TypeWater Washable

Required EquipmentUV light source


Ideal ApplicationAutomotive, Ceramic components, Leak detection, Plastic components

Defect ExamplesCracks, Leaks


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


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