Powder Coating Troubleshooting: 8 Common Defects

1. Fisheyes (Cratering)

Cause: Silicone or oil contamination. Fix: Improve degreasing; check compressed air for oil.

2. Orange Peel

Cause: Powder too coarse, oven too cold. Fix: Increase oven temperature 5?C; reduce spray distance.

3. Faraday Cage Effect

Cause: Electric field concentrates on edges, leaving recesses poorly coated. Fix: Reduce gun voltage to 50?60 kV; use tribo guns.

4. Blistering

Cause: Moisture in substrate or outgassing from castings. Fix: Pre-dry substrate; use outgassing primers for castings.

5. Poor Adhesion

Cause: Insufficient pre-treatment. Fix: Improve pre-treatment process; verify powder chemistry for the substrate.

6. Low Gloss

Cause: Under-cure. Fix: Verify cure schedule with a data recorder; check for oven cold spots.

Oracle Industries offers free troubleshooting support for volume customers. Call +91 86559 96999.