INSTRUCTIONS FOR USE
ZP-5B developer bath can be applied by immersion dip, spray or flow on techniques and must be continuously agitated during use to ensure the developer particles remain suspended during processing. 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 120°F / 48°C. If spray or flow-on techniques are used, care should be taken to avoid foaming as foam bubbles will create holes in the developer film. Use ZAF-2 anti-foaming additive if necessary.
Developer bath 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 developer application. Once the developer is dry, the part should be removed from the dryer to prevent degrading the penetrant’s visibility.
The developer film can be washed off with water spray. If the coating has been baked on or does not wash completely, brushing should be employed along with the water spray to remove the developer completely.
Maintenance Recommendations:
Developer bath concentration can be monitored using a hydrometer or by taking a known volume of the bath, evaporating off the water and then weighing the residue. When using a hydrometer, refer to the table provided below. Density measurement of aqueous suspensions to check concentration is not very accurate but is provided as a convenient guide to estimate concentration of bath. Mix until particles are fully dispersed before measurement.
PREPARATION INSTRUCTIONS
Developer tank should be clean before developer bath is mixed. Fill the tank with the appropriate amount of water and slowly add the appropriate amount of developer powder to the water while stirring or agitating bath until it is completely dissolved. To speed up bath preparation, warm water can be used, however developer bath temperature should never exceed 120°F / 48°C. Developer powder is dusty and use of a simple filter mask may be desirable during handling.
