Why Bubbles Form in EVA Laminated Glass - Causes and Solutions

Main Causes of Bubble Formation:

1. Moisture Contamination

   • EVA's hygroscopic nature absorbs ambient moisture

   • Even 0.1% moisture content can cause bubbling during lamination

   • Solution: Store EVA films in climate-controlled (<30% RH) environments

2. Incomplete Air Evacuation

   • Insufficient vacuum pressure (<0.095MPa) during lamination

   • Improper edge sealing allowing air re-entry

   • Solution: Use vacuum systems with automatic pressure monitoring

3. Temperature Mismanagement

   • Uneven heating (<115°C cold spots or >150°C overheating)

   • Rapid cooling causing thermal contraction bubbles

   • Solution: Implement multi-zone heating with ±2°C accuracy

4. Film Quality Issues

   • Low-grade EVA with inconsistent melt flow indexes

   • Improper additives causing premature cross-linking

   • Solution: Use premium EVA films with <±0.5 MFI variation

Our Technical Recommendations:

• Pre-Lamination Checklist:
  ✓ 24-hour film acclimation at 22-25°C
  ✓ Glass surface cleaning with IPA (≥99.7% purity)
  ✓ Vacuum bag integrity test