Apply HumiSeal conformal coating
Applying HumiSeal conformal coating, produced by Chase Corporation, requires controlled processes to ensure proper protection, adhesion, and reliability. In PCB-Montage, SMT-Bestückung, und Schlüsselfertige PCB-Montage, correct application is critical to achieve consistent coating performance.

Surface preparation (most important step)
Vor der Anwendung Konforme Beschichtung, 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 PCB-Montage.
Masking (protect no-coat areas)
Certain areas must not be coated:
- Steckverbinder und Steckdosen
- Test points
- Switches and contact surfaces
Use tapes, boots, or masking materials to protect these areas during SMT-Bestückung.
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 PCB-Montage
- Provides uniform coverage
- Suitable for both low and high volumes
Selektive Beschichtung (automatisiert)
- High precision using programmable machines
- Ideal for Schlüsselfertige PCB-Montage Produktionslinien
- Reduziert die Anforderungen an die Maskierung
Tauchbeschichtung
- PCB is immersed in coating liquid
- Ensures full coverage
- May result in thicker coating
Bürstenbeschichtung
- Used for small batches or rework
- Less consistent than automated methods
Kontrolle der Schichtdicke
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 SMT-Bestückung.
Aushärtungsprozess
After application, the coating must be cured:
- Lufttrocknung (common for acrylic coatings)
- Wärmehärtung (for urethane or epoxy)
- UV-Härtung (for UV-curable HumiSeal coatings)
Follow manufacturer specifications for time and temperature to ensure full curing.
Inspektion und Qualitätskontrolle
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 Schlüsselfertige PCB-Montage.
Bewährte Praktiken
- Maintain clean working environment
- Control humidity and temperature during application
- Use proper equipment calibration
- Train operators on coating techniques
Schlussfolgerung
Applying HumiSeal conformal coating involves careful surface preparation, proper masking, controlled application, and thorough curing. In PCB-Montage, SMT-Bestückung, und Schlüsselfertige PCB-Montage, 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.
Angebot für Conformal Coating einholen
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Senden Sie uns Ihre Anforderungen und erhalten Sie eine schnelle Antwort von unserem technischen Team.
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Shenzhen Tengxinjie Electronics Co, Ltd.


