PCB before applying HumiSeal

Proper PCB preparation is the most critical step before applying HumiSeal conformal coating, produced by Chase Corporation. I Montering av kretskort, SMT-montering, och Nyckelfärdig PCB-montering, 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 Konform beläggning.

Dry the PCB completely

Moisture trapped on the board can cause serious issues:

• Poor coating adhesion
• Blistering or bubbles
• Korrosion under beläggningen

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-montering.

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 Montering av kretskort.

Surface activation (optional but recommended)

For high-reliability applications:

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

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

Slutsats

Preparing the PCB properly is essential for successful HumiSeal coating. In Montering av kretskort, SMT-montering, och Nyckelfärdig PCB-montering, 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.

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Rekommenderat material

• Akryl (AR)
• Silikon (SR)
• Polyuretan (UR)
• UV-härdbar - UV
• Jag är inte säker / Behöver råd

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Filuppladdning

Dra och släpp filer,, Välj filer att ladda upp Du kan ladda upp upp till 8-filer.

Komprimera alla Gerber-filer, Drill-filer och BOM till en enda ZIP- eller RAR-fil för snabbare bearbetning.

Meddelande

"Ange komponenter eller områden som INTE får beläggas (t.ex. kontakter, testpunkter)." Om du har specifika krav på beläggningsmaterial (t.ex. HumiSeal), ange detta i kommentarsfältet.

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