Applications

LOCTITE® ECCOBOND FP4531 – Epoxy underfill for flip chip on flex applications with 1 mil gap.

  • Item Name: LOCTITE ECCOBOND FP4531
  • Manufacturer: Henkel
  • Product Category: Underfill Adhesive
  • Technologies: Epoxy
  • Applications: Underfill for flip chip on flex applications (1 mil gap); passes NASA outgassing standards
  • Color: Black
  • Cure Type: Heat cure
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: 9 months at -40°C

1. Product Overview

  • Technology: Epoxy
  • Appearance: Black
  • Key Benefits:
    • Snap curable
    • Fast flow
    • Passes NASA outgassing standards
  • Curing Method: Heat cure
  • Application: Underfill
  • Typical Use: Flip chip on flex applications with a 1mil gap

2. Applications

  • Flip chip on flex applications
  • Suitable for high-reliability applications requiring NASA outgassing compliance

3. Typical Properties

Property Value
Uncured Properties
Viscosity (25°C, Brookfield CP52, 20 rpm) 10,000 mPa·s (cP)
Filler Content (%) 62
Pot Life @ 25°C (hours) 24
Usable Dispensing Time (hours) 8
Shelf Life @ -40°C (days) 270
Curing Performance
Gel Time @ 121°C (minutes) 6
Snap Cure Schedule 7 min @ 160°C
Cured Properties
Coefficient of Thermal Expansion (ppm/°C) Below Tg: 28 / Above Tg: 104
Glass Transition Temperature (Tg) (°C) 161
Chloride (Cl⁻) (ppm) 20
Sodium (Na⁺) (ppm) 5
Potassium (K⁺) (ppm) 5
Flexural Modulus (N/mm²) 7,600 (1,102,000 psi)
Thermal Conductivity (W/m-K) 0.61
Electrical Properties
Volume Resistivity (ohm-cm) 1.71 × 10¹⁶
Surface Resistivity (ohms) 1.87 × 10¹⁶
Dielectric Strength (V/mil) 1,470
Dielectric Constant / Dissipation Factor
@ 100 KHz 3.34 / 0.0088
@ 1 MHz 3.29 / 0.0071
@ 2 MHz 3.3 / 0.0073

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