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 Konforme Beschichtung 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
Silikon Konforme Beschichtung is widely regarded as the best balance for high-voltage PCB-Montage und SMT-Bestückung.
Why silicone is ideal:
- Hohe Durchschlagsfestigkeit (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, Parylen is often the top choice in advanced Schlüsselfertige PCB-Montage.
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
- Polyurethan-Beschichtung
- 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 PCB-Montage, risks include:
- Electrical arcing
- Leakage currents
- Electrochemical migration
- Reduced creepage distance
Konforme Beschichtung helps by:
- Increasing surface dielectric strength
- Preventing moisture-induced leakage
- Suppressing arcing and corona discharge
- Improving long-term insulation stability
Schlussfolgerung
- Best overall for high voltage: Konforme Silikonbeschichtung
- Best for extreme/high-end applications: Parylene coating
- Budget alternative: Polyurethan
Unter PCB-Montage, SMT-Bestückung, und Schlüsselfertige PCB-Montage, the right coating choice should be based on voltage level, environment, and reliability requirements—not just cost.
Angebot für Conformal Coating einholen
Haben Sie ein PCB-Projekt, das eine konforme Beschichtung erfordert? Fordern Sie noch heute ein individuelles Angebot an.
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