Product Data Sheet – ZYGLO ZP-14A

Water-soluble Developer

ZYGLO® ZP-14A is a free-flowing powder developer which dissolves in water to form a clear, biodegradable solution. It forms an uniform white coating on the test part surface, providing a contrasting background around penetrant indications. ZP-14A is recommended for use with our post-emulsifiable penetrants (ZL-2C, ZL-27A, ZL-37).

Chemical product icon - developer


  • Bright, highly-defined indications
  • Can be cleaned off with water
  • Even, uniform coverage
  • Chromate and nitrite free


Defect location: open to surface

Ideal for:

  • Use with our post-emulsifiable penetrants
  • Castings
  • Forgings

Defect examples:

  • Cracks
  • Porosity


A blend of organic salts, surface active agents and corrosion inhibitors.

Specification Compliance

  • AMS2644
  • ASME B & PV Code, Sec V
  • ASTM E165/E165M-18
  • ASTM E1417/E1417M
  • MIL-STD-2132D
  • MIL-STD-271F

Product Properties

Form and colour White powder
Density 0.6 g/cm³
AMS 2644 class Form b – Type 1
Sulphur content
< 1,000 ppm
Chloride content
< 1,000 ppm
Corrosion Meets AMS 2644

Like all Magnaflux materials, ZP-14A is closely controlled to ensure batch-to-batch consistency, optimum process control and inspection reliability.

User Recommendations

NDT Method
Penetrant Testing
Storage temperature 10°C to 30°C
Usage temperature
5°C to 55°C
Cleaner SKC-S, ZE-4B, ZR-10C
Post-emulsifiable penetrants  ZL-2C, ZL-27A, ZL-37
UV lamps
EV6000, ST700

Instructions for Use

Before using any developer, ensure the test surface is clean, free from excess penetrant, and dry. Residue from water-based penetrants can be removed with a water spray; solvent-based penetrants by wiping with a solvent cleaner.

With visible penetrants, cracks will appear as red lines and porosity as spots. If you see a general reddish colour or pink film, that means the penetrant was not completely removed.

With fluorescent penetrants, indications will fluoresce bright yellow/green under UV light. If you see a general greenish film, that means the penetrant was not completely removed.

Apply by immersion dip, spray or flow on techniques (see below) for just long enough to completely cover the part.

Dry the part thoroughly. For best results, use forced warm air drying at around 60ºC. Remove from the dryer as soon as the developer is dry or it could bake on and be difficult to remove.

Allow a minimum of 10 minutes development time before inspecting the component.

After inspection, wash off the developer film with a water spray and, if necessary, a brush.

Spray or flow-on application
Avoid foaming as foam bubbles in the developer film can cause voids in the dried coating.

Immersion dip application
Make up a developer bath:

  • Ensure that the developer tank and the part to be tested are clean. Excess penetrant will contaminate the bath and shorten its life.
  • Fill the tank with the appropriate amount of water (see table below) that is no hotter than 50°C. We recommend using soft water or de-ionised water where possible. ZP-14A baths may show traces of fluffy sediment in hard water; this will not interfere with the developer or its removability.
  • Wearing a suitable filter face mask, slowly add the required amount of powder (see table below) while agitating the water.
  • Continue mixing until the powder is fully dispersed.
  • Don’t leave the component in the bath for too long – this will reduce the sensitivity of the process by removing penetrant from shallow discontinuities.

We recommend the following concentrations for the make-up of your developer bath:

Penetrant type Concentration of powder per litre of water
ZYGLO 120 – 200 g


The concentration should be monitored on a regular basis to maintain the correct working strength is maintained. To do this, take a known volume of the bath, evaporate off the water and weigh the residue. The concentration can be calculated as follows:

For a 50 ml sample volume: Weight of residue (g) x 20 = Concentration (g per litre)

A less accurate method is to measure the specific gravity of the bath and cross-reference with the graph at the bottom of this page.

Packaging and Part Numbers

Part number 055C010

Packaging icon: 5Kg/5.7 litre plastic tub

Health & Safety

Review all relevant health and safety information before using this product. For complete health and safety information, refer to the relevant Safety Data Sheet.

Download this Product Data Sheet as a PDF
Graph of ZP-14A bath specific gravity versus concentration at various temperatures