PCB before applying HumiSeal

Proper PCB preparation is the most critical step before applying HumiSeal conformal coating, produced by Chase Corporation. In PCB 어셈블리, SMT 어셈블리, 및 턴키 PCB 어셈블리, 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 컨포멀 코팅.

Dry the PCB completely

Moisture trapped on the board can cause serious issues:

• Poor coating adhesion
• Blistering or bubbles
• 코팅 아래 부식

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 어셈블리.

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 어셈블리.

Surface activation (optional but recommended)

For high-reliability applications:

• Use plasma cleaning to improve surface energy
• Enhances coating adhesion
• Common in aerospace and automotive 턴키 PCB 어셈블리

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

결론

Preparing the PCB properly is essential for successful HumiSeal coating. In PCB 어셈블리, SMT 어셈블리, 및 턴키 PCB 어셈블리, 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.

컨포멀 코팅 견적 받기

PCB 컨포멀 코팅에 대해 궁금한 점이 있으신가요? 엔지니어가 도와드릴 준비가 되어 있습니다.
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• 아크릴(AR)
• 실리콘(SR)
• 폴리우레탄(UR)
• UV 경화 - UV
• 잘 모르겠음 / 조언이 필요함

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"코팅해서는 안 되는 구성 요소 또는 영역(예: 커넥터, 테스트 포인트)을 기재하세요." 특정 코팅 재료 요구 사항(예: 휴미씰)이 있는 경우 의견란에 이를 표시하세요.

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