Item Name: LOCTITE® ECCOBOND EN 3940TX
Manufacturer: Henkel
Technologies: Epoxy
Color: Black liquid
Cure Type: Heat cure (>8 min @ 130 °C)
Package Size: Contact to Techniq VN for details.
Shelf Life: 270 days @ -20 °C
1. Product Overview
LOCTITE ECCOBOND EN 3940TX is a black, one-component epoxy adhesive formulated for glob top and encapsulation. It features thixotropic behavior, rapid curing at moderate temperatures, low glass transition temperature, and high flexibility. The product is halogen-free, offering enhanced environmental safety, and ensures effective waterproof sealing for electronic connectors.
2. Applications
Glob top encapsulation for CSP/BGA connectors
Waterproof sealing for connectors in electronic assemblies
Flexible encapsulant for devices requiring low modulus performance
3. Typical Properties
| Property | Still not mixed (Uncured) | After mixed / Cured |
|---|---|---|
| Appearance | Black liquid | Black solid |
| Viscosity @ 25 °C (shear rate 20 mm²/20 s⁻¹) | 2,275 mPa·s | — |
| Thixotropic Index (2/20 s⁻¹) | 4.4 | — |
| Pot Life @ 25 °C | 3 days | — |
| Shelf Life @ –20 °C | 270 days | — |
| Cure Schedule | >8 min @ 130 °C | — |
| Hardness, Shore D | — | 23 |
| Glass Transition Temp (Tg) | — | 2 °C |
| Coefficient of Thermal Expansion | — | 54 ppm/°C (below Tg), 211 ppm/°C (above Tg) |
| Storage Modulus @ 25 °C | — | 534 N/mm² (77,500 psi) |
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