Item Name: LOCTITE ECCOBOND EN 3707F
Manufacturer: Henkel
Technologies: Epoxy
Color: Light yellow liquid
Cure Type: Ultraviolet (UV) light or Heat cure
Package Size: Contact to Techniq VN for details.
Shelf Life: 6 months
LOCTITE ECCOBOND EN 3707F is a light yellow, single-component epoxy adhesive featuring dual-cure technology. It cures rapidly under UV light and also supports secondary heat curing, ensuring complete polymerization even in shadowed areas. The product is fluorescent under UV light, exhibits excellent dispensability without stringing, and is tailored for encapsulation use where reliability and process efficiency are critical.
Encapsulation for local protection of WLCSP and BGA on circuit boards
Ideal for electronic assemblies requiring rapid UV cure and supplemental heat cure
Used where both shadowed and exposed areas require secure, reliable adhesion and protection
| Property | Uncured | Cured |
|---|---|---|
| Appearance | Light yellow liquid | Solid adhesive |
| Viscosity (25 °C, 20 rpm) | 3,480 mPa·s | — |
| Pot Life (25 °C) | 3 days | — |
| Shelf Life (2–8 °C) | 180 days | — |
| UV Cure | ≥100 mW/cm² for >30s, depth ≥10 mm | — |
| Heat Cure | 30 min @ 80 °C; 5 min @ 100 °C; 1–2 min @ 130 °C | — |
| Glass Transition Temperature (Tg) | — | 36.8 °C |
| CTE Below Tg | — | 50.3 ppm/°C |
| CTE Above Tg | — | 162.2 ppm/°C |
| Storage Modulus (25 °C) | — | 4,400 N/mm² (638,000 psi) |
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