ENVIRONMENTAL PROTECTION • IPC-A-610
PCB Conformal Coating Services
Shield assemblies from moisture, dust, chemicals, and temperature swings. We integrate coating, curing, and inspection directly into your PCBA traveler so every board reaches the field protected.
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PCB conformal coating: Protect your circuit boards
What is conformal coating?
Why is conformal coating necessary?
Key benefits of conformal coating
- •Moisture resistance: Conformal coatings help prevent moisture-related issues, such as short circuits and corrosion, which are common causes of PCB failure.
- •Corrosion protection: Exposure to chemicals and saline environments can cause severe corrosion, leading to functional failure. Conformal coating acts as a barrier, preventing corrosion from damaging your PCBs.
- •Temperature resistance: Coating materials such as silicone and urethane provide excellent protection in high-temperature environments, ensuring the longevity of your products in challenging conditions.
- •Chemical and abrasion resistance: Conformal coatings protect against exposure to harsh chemicals, solvents, and abrasion, making them ideal for industrial and automotive applications.
- •Enhanced reliability: By preventing environmental damage, conformal coating significantly improves the long-term reliability and performance of your products.
Types of conformal coatings we offer
Coating chemistries
Primary resins
Acrylic resin (AR)
Economical and easy to apply and repair. Good moisture and abrasion resistance. Easily removable with solvents, but less effective against solvents like jet fuel.
Silicone resin (SR)
Excellent temperature and humidity resistance. Ideal for environments with high vibrations or extreme temperature variations. Requires specialized solvents for removal.
Urethane resin (UR)
High chemical and moisture resistance. Offers excellent abrasion and solvent resistance. Often used in aerospace and military applications for superior durability.
Specialty options
Parylene coating
A vapor-deposited coating offering exceptional moisture and chemical resistance. Ideal for applications requiring a thin, uniform, and pinhole-free layer of protection.
Hybrid stacks
Mix chemistries to balance reworkability, dielectric strength, and protection.
Masking & keep-outs
Engineered to respect connectors, test pads, and high-voltage spacing.
Conformal coating application methods
Application methods

Conformal coating thickness and cure time
Thickness, curing, and QA
- 1
Surface prep
Pre-clean PCBAs to remove oils, dust, and residues for proper adhesion.
- 2
Mask & fixturing
Protect connectors, test pads, and mechanical interfaces before coating.
- 3
Apply coating
Control thickness (1–5 mils / 25–127 μm) via gauged passes.
- 4
Cure method
Evaporative, moisture, heat, or UV cures selected per resin.
- 5
Inspect & measure
Micrometers, UV inspection, and AOI confirm coverage; defects corrected before release.
How to ensure a successful conformal coating application
Best practices for conformal coating
- •Pre-cleaning the PCB: Ensure the PCB is free of oils, dust, and contaminants before applying the coating. Proper cleaning enhances adhesion and reduces the risk of defects like dewetting or fisheyes.
- •Component spacing: Maintain proper clearance around components to allow the coating to flow evenly and avoid bridging or webs.
- •Avoid over-coating: Coating should be applied only where necessary. Excessive coating can lead to insulation issues or interfere with component functionality.
- •Account for robotic coating limitations: Consider component height and shape when designing PCBs for robotic coating to ensure proper access for the application equipment.
Common conformal coating defects and how to prevent them
- •Dewetting: Caused by surface contamination (oil, wax, or silicone residues). Prevent this by thoroughly cleaning the PCB before coating.
- •Cracking/crazing: Occurs due to excessive coating thickness or improper curing temperatures. Follow manufacturer guidelines for curing and thickness control.
- •Orange peel: Results from uneven atomization or rapid evaporation. Ensure consistent environmental conditions during application.
- •Air bubbles: Can occur from improper mixing or application techniques. Ensure proper equipment maintenance and correct mixing procedures.
- •Fisheyes: Caused by contamination like oil or water. Thoroughly clean and inspect PCBs before coating.
Why choose APTPCB for your conformal coating needs?
Why partner with APTPCB
Integrated delivery
Expertise in PCB assembly and conformal coating
With years of experience in PCB manufacturing and assembly, APTPCB ensures high-quality conformal coating services tailored to your specific product requirements.
High-volume production capability
We offer scalable conformal coating services, from low-volume prototypes to high-volume mass production, without compromising quality.
Industry coverage
Consumer, automotive, industrial, aerospace, and medical deployments supported.
Quality & support
Comprehensive protection
Our conformal coating solutions are designed to meet the demands of a wide range of industries, including consumer electronics, automotive, aerospace, and medical devices.
Precision and quality control
We adhere to strict quality standards to ensure uniform coating, proper adhesion, and reliable protection for your PCBs.
Responsive team
Program managers coordinate coating specs, masking maps, and logistics.
Contact us for conformal coating services
Need conformal coating coverage?
Share stackups, BOMs, environmental targets, and volumes—we’ll return coating material recommendations, masking plans, and lead times within one business day.
