Level 1 Water Washable Fluorescent Penetrant

A water-removeable Level 1 penetrant, ZL-19 is designed for use on rough or unmachined surfaces such as castings and forgings to find larger discontinuities in non-safety critical components. It is ideal for inspecting automotive and general industrial components such as engine cylinder blocks, power train components, rocker arms, pistons, steering knuckles, etc.

ZL-19 washes off parts with ease, leaving less background for clearer indications – even on rough surfaces. The quick rinsing reduces water usage in the inspection process, and the rinse water is easily treatable for simpler disposal.

This economical fluorescent penetrant helps users reduce their over-all cost per part by reducing penetrant loss through drag-out, speeding up the washing and inspection process, and cutting rinse water costs.

ZL-19 can be used with ZP-4D dry powder developer, with ZP-5B water suspendible developer in an agitated tank or with ZP-9F non-aqueous developer. With a UV-A light source, indications will appear as a bright green-yellow fluorescence.

ZL-19 is listed on the QPL SAE AMS 2644 Qualified Product List.


Increase indication detection on cast parts & rough surfaces

  • Increase detection of defects in cast parts, such as hot tears, laps, or cold shuts
  • Indications stand out more because of reduced background fluorescence, even on rough cast surfaces

Speed up your inspection process

  • Quickly apply and remove penetrant due to high surface wetting and easy washability
  • ZL-19 is spray-friendly and will not clog nozzles in automated lines, for less maintenance downtime

Performance value

  • Use less penetrant per part, thanks to lower drag out
  • Penetrant can be reused from the dwell cycle, so more of it stays in your tank instead of getting carried away on parts


  • Level 1 sensitivity
  • Water washable
  • Excellent rough surface washability
  • Bright, high contrast indications
  • Clean rinsing on cast parts
  • Won’t clog spray nozzles in automated systems
  • Good surface wetting
  • High flash point
  • Easy washability
  • Less time to rinse
  • Use less penetrant per part


Ordering Information

5 gal / 18.9 L01-3263-40

55 gal / 208 L drum01-3263-45

Product Properties

NDT TypeFluorescent Penetrant Testing

Penetrant TypeType 1

Fluorescent Penetrant SensitivityLevel 1 - Low Sensitivity

Penetrant MethodsMethod A, Method C

Removal TypeWater Washable

Required EquipmentUV light source


Ideal ApplicationCastings, Engine cylinder blocks, Forgings, Pistons, Power train components, Rocker arms, Rough surface finish, Steering knuckles, Unmachined parts

Defect ExamplesCold shuts, Cracks, Delamination, Laps, Porosity, Seams


StandardsAECL, AMS 2644, ASME BPVC, ASTM E1417, Boeing BAC 5423 PSD 6-46 or 8-4, Boeing PS-21202, GE P3TF2, Honeywell EMS 52309, QPL SAE AMS 2644, T9074-AS-GIB-010/271


Related Products

  • ZP-4D


    Dry powder developer for Form a penetrant testing and QPL SAE AMS 2644 approved.

  • ZP-5B


    Water suspendible developer for Form c penetrant testing, QPL SAE AMS 2644

  • ZP-9F


    Solvent-based developer for Type 1 Form d or Type 2 Form e penetrant testing, QPL SAE AMS 2644

  • EV6000


    Portable, handheld LED UV lamp for black light inspection during fluorescent PT or MT testing



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