A potting compound is a liquid resin that is poured around an electronic assembly and cured into a solid block to protect it from moisture, dust, vibration, chemicals and thermal shock. It also improves electrical insulation and can help dissipate heat. Potting is one of the most effective ways to make electronics survive harsh, outdoor or high-reliability environments.
What is a potting compound used for?
Potting compounds are used wherever electronics must be protected for the long term. Common uses include:
- Encapsulating PCBs and circuit boards
- Protecting transformers, coils and inductors
- Sealing sensors, connectors and modules
- Protecting EV battery packs and power electronics
- Waterproofing LED drivers and outdoor equipment
The three main types of potting compound
Most potting systems fall into three chemistries, each with different strengths:
Epoxy potting compounds
Rigid and tough, with excellent chemical resistance and strong adhesion. Best where maximum protection and hardness are needed. Explore our epoxy potting compounds.
Silicone potting compounds
Soft and flexible, with outstanding high-temperature performance and stress relief — ideal for thermal cycling and sensitive components.
Polyurethane potting compounds
Tough yet elastic, offering the best vibration damping and impact resistance at moderate temperatures.
How to choose the right potting compound
Match the resin to your application by considering:
- Temperature range — silicone for high heat, epoxy and PU for moderate ranges
- Heat dissipation — choose a thermally conductive grade for hot components
- Vibration — polyurethane or soft silicone for dynamic environments
- Reworkability — softer compounds are easier to remove for repair
- Safety — flame-retardant grades for high-voltage or regulated products
Still unsure? Contact our engineers with your application and we’ll recommend a grade and send a free sample.