Potting Resin Defects: What Causes Bubbles, Heat & Cracks?

Potting resin defects can lead to real damage—both to your components and your brand. Whether you’re potting LED strips, PCBs, or power supplies, knowing how to prevent bubbles, thermal buildup, and cracking is critical.

What Are the Most Common Potting Resin Defects?

• Bubbles: Caused by poor degassing or trapped air in substrates
• Overheating: Fast curing or thick pours without cooling
• Cracks: Caused by shrinkage, rigid resin, or stress mismatch

How to Prevent Potting Resin Defects (7 Tips)

1. Use low-exothermic epoxy like 702AB
2. Choose flexible resin for shock absorption (e.g., 1908AB PU)
3. Mix slowly and vacuum degas to eliminate bubbles
4. Pour in layers if thickness >10mm
5. Preheat parts to reduce outgassing
6. Control humidity during curing (keep under 60%)
7. Use recommended curing guidelines

Best Resins for Crack-Free, Bubble-Free Potting

• 702AB – Fast curing, minimal heat, clear finish
• 2119AB – Long pot life, anti-bubble, ideal for deeper fills
• 1908AB – PU soft resin for flexible applications

Need Help Choosing a Potting Resin?
Contact us or visit our full product catalog.