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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

BERGQUIST microTIM mTIM 1028 Thermal Interface Coating High performance thermal management solution for nickel finished heat sinks, optical transceivers, and data center liquid cooling systems

BERGQUIST microTIM mTIM 1028 is purpose built for riding cage assemblies in servers, switches, and routers, interfacing with electroless nickel plated copper or aluminum heat sinks. It ensures stable operation in high power transceiver modules while also extending applicability to liquid cooling components, heat pipes, and fin based dissipative structures.

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