Selective coating with HumiSeal
Selective coating with HumiSeal conformal coating, developed by Chase Corporation, is an automated process that applies coating only to specific areas of a PCB, rather than covering the entire board. It is widely used in modern Assemblage du circuit imprimé, Assemblage SMT, et Assemblage de circuits imprimés clés en main for precision and efficiency.

How selective coating works
Selective coating systems use programmable equipment to control exactly where the coating is applied:
- CAD data or teaching programs define coating paths
- Robotic valves or spray heads dispense HumiSeal precisely
- The machine avoids connectors, test points, and sensitive areas
- Coating is applied in controlled patterns and thickness
This eliminates the need for extensive manual masking.
Principaux avantages
Haute précision
- Coating is applied only where needed
- Protects critical components without affecting connectors
Réduction du masquage
- Minimal use of tapes or boots
- Saves time and labor in Assemblage du circuit imprimé
Qualité constante
- Uniform coating thickness (typically 25–75 µm)
- High repeatability in Assemblage SMT
Économies de matériaux
- Less coating waste compared to dip or full spray methods
Faster production
- Ideal for high-volume Assemblage de circuits imprimés clés en main lignes
Applications typiques
Selective coating with HumiSeal is used in:
- Électronique automobile
- Systèmes de contrôle industriel
- LED lighting PCBs
- Electronique grand public
- Aerospace and medical devices
These applications require both protection and precision.
Selective coating vs traditional methods
- Revêtement sélectif → precise, automated, minimal masking
- Revêtement par pulvérisation → broader coverage, requires masking
- Revêtement par immersion → full coverage, less control
- Revêtement au pinceau → manual, used for rework
Selective coating is considered the most advanced method in Assemblage SMT.
Important process considerations
- Proper PCB cleaning before coating
- Correct viscosity settings for the machine
- Accurate programming of coating paths
- Post-coating curing (UV, thermal, or moisture)
- Inspection for coverage and defects
Conclusion
Selective coating with HumiSeal is a high-precision, automated method that applies conformal coating only where needed. In Assemblage du circuit imprimé, Assemblage SMT, et Assemblage de circuits imprimés clés en main, it offers superior efficiency, consistency, and cost control compared to traditional coating methods.
We support HumiSeal and equivalent revêtement conforme solutions for your PCBA projects.
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