LOCTITE ECCOBOND FP4526 is a blue epoxy underfill designed for capillary flow in flip chip applications. It has excellent wettability, adhesion, and flow properties, making it suitable for high-reliability applications, including both Hi-Pb and Pb-free environments.
| Property | Value |
|---|---|
| Viscosity (Brookfield, 25°C) | 4,700 mPa·s |
| Specific Gravity | 1.7 |
| Maximum Particle Size | 27 µm |
| Flow Rate (@ 90°C, 3 mil gap) | 30 sec |
| Pot Life (@ 25°C) | 36 hours |
| Gel Time (@ 121°C) | 9 min |
| Shelf Life (@ -40°C) | 274 days |
| Cure Method | Time & Temperature |
|---|---|
| Heat Sink / Hot Plate | 15 min @ 165°C |
| Convection Oven | 30 min @ 165°C |
| Property | Value |
|---|---|
| Coefficient of Thermal Expansion (Below Tg) | 33 ppm/°C |
| Coefficient of Thermal Expansion (Above Tg) | 101 ppm/°C |
| Glass Transition Temperature (Tg) | 133°C |
| Flexural Modulus | 8,500 N/mm² |
| Chloride (Cl⁻) Content | 25 ppm |
| Sodium (Na⁺) Content | 10 ppm |
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