Recommended thickness for HumiSeal coating

The recommended thickness for HumiSeal conformal coating, produced by Chase Corporation, is typically 25 µm to 75 µm (microns). This range is widely accepted in PCB Assembly, SMT Assembly, and Turnkey PCB Assembly to achieve optimal protection without affecting performance.

Standard thickness guidelines

• 25–50 µm → Standard protection for general electronics
• 50–75 µm → Enhanced protection for harsh environments (humidity, chemicals, vibration)

This thickness ensures good insulation, moisture resistance, and durability.

Recommended thickness by coating type

Different HumiSeal materials may require slight adjustments:

• Acrylic coatings → 25–50 µm (most common and cost-effective)
• Urethane coatings → 30–75 µm (better chemical resistance)
• Silicone coatings → 50–100 µm (high temperature and flexibility)
• UV-curable coatings → typically 25–50 µm for fast production lines

Choosing the right thickness is critical in SMT Assembly to maintain consistency.

Why thickness control matters

Too thin coating:

• Inadequate moisture and corrosion protection
• Lower dielectric strength

Too thick coating:

• Risk of cracking or peeling
• Possible interference with connectors and components
• May impact heat dissipation

Maintaining correct thickness improves reliability in PCB Assembly.

How to control coating thickness

• Use selective or automated spray coating systems
• Adjust viscosity and spray parameters
• Apply multiple thin layers instead of one thick layer
• Measure thickness using gauges or inspection tools

These practices are standard in Turnkey PCB Assembly.

Industry standards reference

Typical thickness recommendations align with:

• IPC-CC-830
• Internal process specifications for conformal coating

Conclusion

The recommended HumiSeal coating thickness is 25–75 µm, depending on application and environment. In PCB Assembly, SMT Assembly, and Turnkey PCB Assembly, proper thickness control ensures reliable protection, long-term durability, and optimal electrical performance.

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

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