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LOCTITE® ECCOBOND FP4323 – Epoxy glob top encapsulant for chip-on-board and plastic PGA applications.

  • Item Name: LOCTITE ECCOBOND FP4323
  • Manufacturer: Henkel
  • Product Category: Epoxy Encapsulant (Glob Top)
  • Technologies: Epoxy with 65% silica filler; two-component system (Component A: Black resin, Component B: Beige hardener)
  • Applications: Encapsulation for chip-on-board and Plastic PGA applications on plastic substrates
  • Color: Black (mixed)
  • Cure Type: Heat cure
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: 12 months (at 25°C for individual components)

1. Product Overview

LOCTITE ECCOBOND FP4323 is a black epoxy-based encapsulant designed for glob top applications. It offers:

  • Low Coefficient of Thermal Expansion (CTE) for improved thermal cycling.
  • High purity, thixotropic properties, and excellent resistance to moisture and chemicals.
  • 65% silica filler content for enhanced mechanical strength.
  • Heat-cure system for strong adhesion and durability.

2. Applications

  • Encapsulant for chip-on-board (COB) and plastic pin grid array (PGA) applications.
  • Suitable for plastic substrates.
  • Provides flow control to prevent excessive spreading beyond the chip.

3. Typical Properties

Properties Part A Part B Mixed
Appearance Black Beige Black
Viscosity (25°C, mPa·s) 172,500 (2 rpm) / 115,000 (20 rpm) 250,000 (2 rpm) / 72,500 (20 rpm) 220,000 (2 rpm) / 100,000 (20 rpm)
Specific Gravity 1.7 1.7 1.67
Shelf Life 12 months (@ 25°C) 12 months (@ 25°C) 9 months (@ -40°C)
Pot Life (@ 25°C) 2 days
Work Life (@ 25°C) 48 hours
Gel Time (@ 121°C) 11 minutes

4. Curing Performance

Cure Schedule Conditions
Standard Cure 4 hours @ 150°C or 1 hour @ 170°C
Alternative Cure 2 hours @ 125°C + 4 hours @ 150°C
Recommended Preheat 90°C for best adhesion

5. Cured Material Properties

Property Value Test Method
Glass Transition Temperature (Tg) 174°C TMA
CTE (ppm/°C, <Tg) 28 ASTM D-3386
Thermal Conductivity (W/m-K) 0.63
Shore Hardness (D) 97 ISO 868
Water Absorption (8h @ 100°C, %) 0.25 ISO 62
Dielectric Constant (1 kHz / 100 MHz / 1 GHz) 3.7 / 3.59 / 3.44 IEC 60250
Volume Resistivity (Ω·cm) 6.2×10¹⁴ IEC 60093
Surface Resistivity (Ω) 1.6×10¹⁴ IEC 60093

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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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