Process Control

ZESTRON Resin Test

Indication of resin-based residues on pcb assemblies

The ZESTRON® Resin Test visually and temporarily identifies the local distribution of resin based residues on electronic assemblies via a color reaction. Critical resin residues, which cause poor adhesion of conformal coatings and delamination effects can be localized during the production and removed by a cleaning step. Thus the critical resin amount of <40 μg/cm² (258.06 μg/sq in) according to J-STD 001 can be met. 

This test complements analytical methods such as Ionic Contamination Measurement (detection of inorganic residues) and the ZESTRON® Flux Test (detection of activators/acids). 

Advantages of the ZESTRON Resin Test:

  • Localized detection of resin-based contamination on electronic assemblies
  • Quick and easy test method. No extensive training required
  • No specific test equipment needed
  • No additional floor space requirements
  • No investment costs
  • Can be used throughout the facility
  • On-site sampling inspection during production
  • Low cost per tested part

Simple Test procedure in a few steps:


 Application                           Rinse and dry                        Interpretation

Alternative Products


  • Detection of resin-based contamination on pcb assemblies
  • On-site sampling inspection during production