Medical PCB Conformal Coating

Medical electronics used in PCB Assembly and SMT Assembly require extremely reliable Conformal Coating to ensure safety, durability, and compliance with strict industry standards. The most commonly used coatings in medical PCBs are parylene, silicone, and acrylic, each selected based on application requirements.

Most preferred: parylene Conformal Coating

Parylene is widely considered the best coating for medical PCBs, especially in high-reliability and implantable devices.

Key advantages:

• Biocompatible (suitable for medical use)
• Ultra-thin, pinhole-free coating for complete protection
• Excellent barrier against moisture, chemicals, and bodily fluids
• Conformal coverage even on complex geometries

Because of these properties, parylene is commonly used in devices such as implantable sensors, surgical tools, and diagnostic equipment in advanced PCB Assembly.

Flexible option: silicone Conformal Coating

Silicone is another popular choice for medical electronics, especially for external or wearable devices.

Key advantages:

• High flexibility, ideal for devices subject to movement
• Excellent resistance to temperature changes and humidity
• Good electrical insulation
• Suitable for wearable and portable medical devices

Silicone is often used in monitoring devices and equipment exposed to varying environmental conditions in SMT Assembly.

Cost-effective option: acrylic Conformal Coating

Acrylic coatings are used in non-critical medical electronics where cost and ease of repair are important.

Key advantages:

• Easy to apply and fast drying
• Simple to remove and rework
• Low cost

However, acrylic provides lower resistance to chemicals and moisture compared to parylene and silicone, limiting its use in high-end medical PCB Assembly.

Other coatings in medical applications

Polyurethane (urethane)

• Good chemical resistance
• Used in environments requiring protection from cleaning agents

Epoxy

• Strong and durable
• Limited use due to rigidity and poor reworkability

How to choose the right coating for medical PCBs

• Implantable / high-reliability devices → Parylene
• Wearable / flexible devices → Silicone
• General medical electronics → Acrylic
• Chemical exposure → Polyurethane

Final conclusion

For medical PCB Assembly and SMT Assembly, parylene Conformal Coating is the top choice due to its biocompatibility and superior protection. Silicone is ideal for flexible and wearable devices, while acrylic offers a cost-effective solution for less demanding applications. Selecting the right Conformal Coating ensures long-term reliability and compliance in medical electronics.

Get a Conformal Coating Quote

Looking for a trusted PCBA partner with conformal coating capability? Let’s talk.
Send us your requirements and get a fast response from our engineering team.

✔ 24-hour response    ✔ Engineering support    ✔ Small & Mass Production

Please enable JavaScript in your browser to complete this form.

Name *

Email *

Layout Email Name

WhatsAPP

Preferred Material

• Acrylic (AR)
• Silicone (SR)
• Polyurethane (UR)
• UV Curable - UV
• I'm not sure / Need advice

File upload

Drag & Drop Files, Choose Files to Upload You can upload up to 8 files.

Please compress all Gerber files, Drill files, and BOM into a single .ZIP or .RAR file for faster processing.

Message

"Please list components or areas that must NOT be coated (e.g., connectors, test points)." If you have specific coating material requirements (e.g., HumiSeal), Please indicate this in the comment box.

Submit

Shenzhen Tengxinjie Electronics Co., Ltd.