HumiSeal protect PCBs from moisture

HumiSeal conformal coating, developed by Chase Corporation, protects PCBs from moisture by forming a thin, uniform barrier layer over electronic components and conductive surfaces. This protection is essential in PCB Assembly, SMT Assembly, and Turnkey PCB Assembly, where exposure to humidity can lead to corrosion, leakage currents, and failure.

Moisture barrier protection

The primary function of Conformal Coating is to act as a physical barrier:

• Seals PCB surfaces against water vapor and condensation
• Prevents moisture from reaching metal traces and solder joints
• Reduces the risk of oxidation and corrosion

HumiSeal coatings are engineered with low moisture permeability, making them highly effective in humid environments.

Prevention of corrosion

Moisture can cause oxidation on copper traces and component leads:

• Leads to increased resistance and signal issues
• Can eventually cause open circuits or failure

HumiSeal isolates these conductive parts from air and moisture, significantly reducing corrosion risks in PCB Assembly.

Reduction of leakage currents

In humid conditions, moisture can create unintended conductive paths:

• Causes leakage currents between closely spaced conductors
• Leads to short circuits or unstable performance

HumiSeal coatings provide strong dielectric insulation, preventing current leakage in dense SMT Assembly designs.

Protection against condensation

Rapid temperature changes can cause condensation on PCBs:

• Water droplets form on surfaces
• Can instantly affect circuit performance

HumiSeal creates a protective layer that minimizes the impact of condensation, especially in outdoor or automotive applications.

Resistance to humidity and environmental stress

Different HumiSeal chemistries (acrylic, silicone, urethane) offer tailored protection:

• Acrylic → good general moisture resistance
• Silicone → excellent performance in high humidity and temperature cycling
• Urethane → strong chemical and moisture resistance

This flexibility allows optimal protection in Turnkey PCB Assembly for various environments.

Sealing against contaminants

Moisture often carries contaminants such as salts and dust:

• These accelerate corrosion and electrical failure
• Particularly critical in marine and industrial environments

HumiSeal coatings prevent both moisture and contaminant ingress.

Long-term reliability improvement

By blocking moisture-related damage, HumiSeal helps:

• Extend PCB lifespan
• Maintain stable electrical performance
• Reduce failure rates in harsh environments

This is why it is widely used in automotive, aerospace, and industrial PCB Assembly.

Conclusion

HumiSeal protects PCBs from moisture by forming a durable, insulating barrier that prevents water ingress, corrosion, and leakage currents. In PCB Assembly, SMT Assembly, and Turnkey PCB Assembly, it plays a vital role in ensuring long-term reliability and performance in humid and challenging environments.

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