Item Name: LOCTITE® ECCOBOND EN 3871
Manufacturer: Henkel
Technologies: Epoxy
Color: Clear liquid
Cure Type: Heat cure (120 min @ 85 °C)
Package Size: Contact to Techniq VN for details.
Shelf Life: 180 days @ -20 °C
1. Product Overview
LOCTITE ECCOBOND EN 3871 is a one-component, optically clear epoxy encapsulant designed for semiconductor and OLED applications. It provides excellent transparency, UV resistance to prevent yellowing, and strong moisture protection. The adhesive cures by heat, offering reliable stability and durability under high humidity and elevated temperatures.
2. Applications
OLED packaging
Semiconductor encapsulation
Electronic devices requiring high moisture resistance and long-term optical clarity
3. Typical Properties
| Property | Still not mixed (Uncured) | After mixed / Cured |
|---|---|---|
| Appearance | Clear liquid | Optically clear solid |
| Viscosity (25 °C, 5 rpm) | 22,900 mPa·s | — |
| Work Life @ 25 °C | 8 hours | — |
| Shelf Life @ –20 °C | 180 days | — |
| Cure Schedule | 120 min @ 85 °C | — |
| Coefficient of Thermal Expansion | — | 77 ppm/°C (below Tg), 156 ppm/°C (above Tg) |
| Glass Transition Temp (Tg) | — | 117 °C |
| Refractive Index | — | 1.5 |
| Storage Modulus @ 25 °C | — | 2,246 N/mm² (325,754 psi) |
| Water Vapor Permeability (50 °C/100% RH) | — | 6.9 g·mil/100 in²·day |
| Die Shear Strength (Glass/Glass, 4×4 mm) | — | 14.5 kgf |
| Transmittance (100 µm laminate) | — | >95% @ 400 nm, >97% @ 450 nm |
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