Apply HumiSeal conformal coating
Applying HumiSeal conformal coating, produced by Chase Corporation, requires controlled processes to ensure proper protection, adhesion, and reliability. In Assemblage du circuit imprimé, Assemblage SMT, et Assemblage de circuits imprimés clés en main, correct application is critical to achieve consistent coating performance.

Surface preparation (most important step)
Avant d'appliquer Revêtement conforme, the PCB must be thoroughly prepared:
- Remove flux residues, oils, dust, and contaminants
- Use approved cleaning methods (solvent cleaning, ultrasonic, or deionized water)
- Ensure the board is completely dry
Poor cleaning is one of the main causes of coating defects in Assemblage du circuit imprimé.
Masking (protect no-coat areas)
Certain areas must not be coated:
- Connecteurs et prises
- Test points
- Switches and contact surfaces
Use tapes, boots, or masking materials to protect these areas during Assemblage SMT.
Choose the application method
HumiSeal coatings can be applied using several methods depending on production volume:
Spray coating (manual or automated)
- Most common method in Assemblage du circuit imprimé
- Provides uniform coverage
- Suitable for both low and high volumes
Revêtement sélectif (automatisé)
- High precision using programmable machines
- Ideal for Assemblage de circuits imprimés clés en main lignes de production
- Réduit les besoins de masquage
Revêtement par immersion
- PCB is immersed in coating liquid
- Ensures full coverage
- May result in thicker coating
Revêtement au pinceau
- Used for small batches or rework
- Less consistent than automated methods
Contrôle de l'épaisseur du revêtement
Maintain proper thickness (typically 25–75 µm):
- Avoid too thin (insufficient protection)
- Avoid too thick (risk of cracking or heat issues)
Thickness control is essential for consistent quality in Assemblage SMT.
Processus de durcissement
After application, the coating must be cured:
- Séchage à l'air (common for acrylic coatings)
- Durcissement par la chaleur (for urethane or epoxy)
- Durcissement par UV (for UV-curable HumiSeal coatings)
Follow manufacturer specifications for time and temperature to ensure full curing.
Inspection et contrôle de la qualité
After curing, inspect the coating:
- Use UV light to verify coverage (if UV tracer is present)
- Check for bubbles, voids, or missed areas
- Ensure no overcoating on masked areas
Inspection ensures coating quality in Assemblage de circuits imprimés clés en main.
Meilleures pratiques
- Maintain clean working environment
- Control humidity and temperature during application
- Use proper equipment calibration
- Train operators on coating techniques
Conclusion
Applying HumiSeal conformal coating involves careful surface preparation, proper masking, controlled application, and thorough curing. In Assemblage du circuit imprimé, Assemblage SMT, et Assemblage de circuits imprimés clés en main, following these steps ensures optimal protection, improved reliability, and long-term performance of electronic products.
We support HumiSeal and equivalent conformal coating solutions for your PCBA projects.
Obtenir un devis pour un revêtement conforme
Garantissez la fiabilité à long terme de vos circuits imprimés grâce à nos solutions de revêtement. Commencez ici.
Envoyez-nous vos exigences et obtenez une réponse rapide de notre équipe d'ingénieurs.
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Shenzhen Tengxinjie Electronics Co. Ltd.


