IPC-CC-830 Conformal Coating: Sourcing & Inspection in China
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IPC-CC-830 (revision B) is the qualification and performance standard for conformal coatings applied to China-manufactured PCBAs — acrylic (AR), urethane (UR), silicone (SR), and parylene each with different thickness and rework characteristics. The two things that go wrong are coating thickness outside the 25–75 µm range typical for acrylics and missed keep-out areas over connectors and test points. We check coating type, dry-film thickness, and coverage against IPC-CC-830B rather than a visual glance.
Conformal coating is a thin protective film over a PCBA to resist moisture, dust, and corrosion; IPC-CC-830 defines its qualification and inspection. The common pitfall is the factory coating over connectors or under-curing, so we verify thickness with a meter and confirm masking on keep-out zones.
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FAQ
Which conformal coating type should I choose for China-made boards?
Acrylic (AR) is cheapest and easiest to rework; urethane (UR) resists solvents; silicone (SR) handles high temperature and flex; parylene gives the thinnest uniform coverage but needs vacuum deposition. Match it to your environment and rework needs.
How is conformal coating thickness verified?
Dry-film thickness is measured with a gauge or wet-film comb, typically 25–75 µm for acrylics under IPC-CC-830B. UV tracer dye in the coating also lets inspectors confirm full coverage and keep-out masking under UV light.
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