PCB before applying HumiSeal

Proper PCB preparation is the most critical step before applying HumiSeal conformal coating, produced by Chase Corporation. In PCB-assemblage, SMT-assemblage, en Turnkey PCB-assemblage, poor preparation is the leading cause of coating failure such as delamination, bubbles, or corrosion.

Remove all contaminants

After soldering, PCBs often have residues that must be eliminated:

• Flux residues (especially no-clean flux)
• Oils from handling
• Dust and particles
• Ionic contamination

Cleaning methods:

• Solvent cleaning (IPA or dedicated cleaners)
• Ultrasonic cleaning for complex assemblies
• Deionized (DI) water cleaning systems

A clean surface ensures proper adhesion of Conforme coating.

Dry the PCB completely

Moisture trapped on the board can cause serious issues:

• Poor coating adhesion
• Blistering or bubbles
• Corrosie onder de coating

Best practices:

• Air dry or use compressed air
• Bake PCB at 50–80°C for 30–60 minutes if needed
• Ensure no moisture remains under components

Inspect before coating

Before coating, perform a visual and quality inspection:

• Check for solder defects (bridges, cold joints)
• Ensure no residues remain
• Verify components are properly mounted

Fixing issues after coating is much more difficult in SMT-assemblage.

Mask critical areas

Certain areas must not be coated:

• Connectors and edge contacts
• Test points
• Switches and mechanical interfaces

Use masking tape, boots, or removable latex to protect these zones during PCB-assemblage.

Surface activation (optional but recommended)

For high-reliability applications:

• Use plasma cleaning to improve surface energy
• Enhances coating adhesion
• Common in aerospace and automotive Turnkey PCB-assemblage

Control handling and environment

• Wear gloves to avoid fingerprints
• Work in a clean, dust-free environment
• Maintain controlled humidity and temperature

Contamination during handling can compromise coating quality.

Final readiness checklist

Before applying HumiSeal:

• PCB is clean and contamination-free
• Fully dry with no trapped moisture
• Masking is correctly applied
• Inspection is completed
• Environment is controlled

Conclusie

Preparing the PCB properly is essential for successful HumiSeal coating. In PCB-assemblage, SMT-assemblage, en Turnkey PCB-assemblage, thorough cleaning, drying, inspection, and masking ensure strong adhesion, reliable protection, and long-term performance.

We support HumiSeal and equivalent conformal coating solutions for your PCBA projects.

Vraag een offerte aan voor conforme coating

Hebt u vragen over conformal coating voor uw PCB? Onze ingenieurs staan klaar om u te helpen.
Stuur ons je vereisten en krijg snel antwoord van ons engineeringteam.

✔ 24-uurs respons ✔ Engineering-ondersteuning ✔ Kleine & massaproductie

Schakel JavaScript in uw browser in om dit formulier in te vullen.

Email Preferred WhatsAPP

Naam *

E-mail *

WhatsAPP

Aanbevolen materiaal

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

Bestanden uploaden

Bestanden slepen en neerzetten,, Bestanden kiezen om te uploaden U kunt maximaal 8 bestanden uploaden.

Comprimeer alle Gerber-bestanden, boorbestanden en BOM in een enkel .ZIP- of .RAR-bestand voor snellere verwerking.

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.

Stuur in

Shenzhen Tengxinjie Electronics Co, Ltd.