Apply HumiSeal conformal coating

Applying HumiSeal conformal coating, produced by Chase Corporation, requires controlled processes to ensure proper protection, adhesion, and reliability. In PCB-assemblage, SMT-assemblage, en Turnkey PCB-assemblage, correct application is critical to achieve consistent coating performance.

Surface preparation (most important step)
Voor het aanbrengen Conforme coating, 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-assemblage.

Masking (protect no-coat areas)
Certain areas must not be coated:

• Connectoren en stopcontacten
• Test points
• Switches and contact surfaces

Use tapes, boots, or masking materials to protect these areas during SMT-assemblage.

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-assemblage
• Provides uniform coverage
• Suitable for both low and high volumes

Selectieve coating (geautomatiseerd)

• High precision using programmable machines
• Ideal for Turnkey PCB-assemblage productielijnen
• Minder eisen aan maskering

Dompelcoating

• PCB is immersed in coating liquid
• Ensures full coverage
• May result in thicker coating

Kwastcoating

• Used for small batches or rework
• Less consistent than automated methods

Controle coatingdikte

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-assemblage.

Uithardingsproces

After application, the coating must be cured:

• Drogen aan de lucht (common for acrylic coatings)
• Warmte uitharding (for urethane or epoxy)
• UV-uitharding (for UV-curable HumiSeal coatings)

Follow manufacturer specifications for time and temperature to ensure full curing.

Inspectie en kwaliteitscontrole

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 Turnkey PCB-assemblage.

Beste praktijken

• Maintain clean working environment
• Control humidity and temperature during application
• Use proper equipment calibration
• Train operators on coating techniques

Conclusie

Applying HumiSeal conformal coating involves careful surface preparation, proper masking, controlled application, and thorough curing. In PCB-assemblage, SMT-assemblage, en Turnkey PCB-assemblage, 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.

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Aanbevolen materiaal

• Acryl (AR)
• Silicone (SR)
• Polyurethaan (UR)
• UV-uithardbaar - UV
• Ik weet het niet zeker / Heb advies nodig

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Layout Material Preferred

Bericht

"Vermeld onderdelen of gebieden die NIET mogen worden gecoat (bijv. connectoren, testpunten)." Als u specifieke eisen stelt aan het coatingmateriaal (bijv. HumiSeal), geef dit dan aan in het opmerkingenveld.

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Shenzhen Tengxinjie Electronics Co, Ltd.