Best coating for high voltage PCB
For high-voltage applications, the key requirement is high dielectric strength (insulation capability), along with resistance to moisture, contamination, and electrical arcing. The best Revêtement conforme is not just one type—it depends on performance level—but generally:
👉 Silicone and parylene coatings are considered the best for high-voltage PCBs

Best overall: Silicone conformal coating
Silicone Revêtement conforme is widely regarded as the best balance for high-voltage Assemblage du circuit imprimé et Assemblage SMT.
Why silicone is ideal:
- Résistance diélectrique élevée (up to ~500 V/mil)
- Excellent performance under high temperature and humidity
- Flexible → reduces cracking under electrical stress
- Strong resistance to corona discharge and arcing
Silicone coatings are commonly used in power electronics, automotive systems, and industrial high-voltage designs where reliability is critical.
Best for extreme performance: Parylene coating
If you need the highest insulation performance, parylène is often the top choice in advanced Assemblage de circuits imprimés clés en main.
Advantages:
- Extremely uniform, pinhole-free coating (vapor deposition)
- Very high dielectric strength and insulation reliability
- Excellent protection against moisture and contamination
- Ideal for compact, high-voltage, high-density designs
Limitation: High cost and complex processing
Other viable options
- Revêtement en polyuréthane
- Good dielectric strength (~350 V/mil)
- Strong chemical resistance
- Suitable for industrial environments
- Epoxy coating
- High insulation and durability
- Better for harsh environments but less flexible
- Acrylic coating
- Lower cost, moderate dielectric strength (~300–400 V/mil)
- Not ideal for high-voltage or harsh conditions
Why coating matters for high voltage
In high-voltage Assemblage du circuit imprimé, risks include:
- Electrical arcing
- Leakage currents
- Electrochemical migration
- Reduced creepage distance
Revêtement conforme helps by:
- Increasing surface dielectric strength
- Preventing moisture-induced leakage
- Suppressing arcing and corona discharge
- Improving long-term insulation stability
Conclusion
- Best overall for high voltage: Revêtement conforme en silicone
- Best for extreme/high-end applications: Parylene coating
- Budget alternative: Polyuréthane
En Assemblage du circuit imprimé, Assemblage SMT, et Assemblage de circuits imprimés clés en main, the right coating choice should be based on voltage level, environment, and reliability requirements—not just cost.
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