Zyglo® ZP-14A is a white free-flowing powder, which dissolves in water to form a developer solution. ZP-14A is used as a general-purpose water-soluble developer for the enhancement of indications formed by Zyglo® penetrants. It produces a uniform white porous coating when it dries that is easily removed in post inspection cleaning by a water spray. Once the developer bath has been made up, no in use agitation is required to maintain developer uniformity.

ZP-14A can be used in open tanks without ventilation as there are no toxic fumes or flammability to the bath. The bath may show a trace of fluffy sediment if the water is hard. This sediment does not interfere with developing or removability. For a clear solution, soft water or de-ionized water is recommended.

METHOD OF APPLICATION

Zyglo® ZP-14A can be applied by immersion dip, spray or flow on techniques, with immersion being the preferred method. If the immersion dip application is used, care must be taken to avoid transferring penetrant into the developer bath. Complete removal of surface penetrant will prolong the developer bath life. The developer bath temperature should not exceed 120ºF. If the spray or flow on techniques are used, care should be taken to avoid foaming as foam bubbles will cause holes in the developer film when they break.

The developer is applied after the surface penetrant has been removed. Complete coverage of the part is essential to quality inspection. The application time is only long enough to cover the part completely. Additional contact with the developer bath may result in reduced sensitivity due to removal of penetrant from shallow discontinuities by detergent action. For best results, forced warm air drying (140ºF/60ºC) is recommended after the application of developer. Once the developer is dry, the part should be removed from the dryer to prevent degrading the penetrant's fluorescence.