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BERGQUIST LIQUI FORM TLF LF3500 – Liquid Thermal Gap Filler – High-Performance Electronics and Power Modules

  • Item Name: BERGQUIST LIQUI FORM TLF LF3500
  • Manufacturer: Henkel
  • Product Category: Thermally Conductive Gel (Thermal Interface Material – TIM)
  • Technologies: Silicone-based, Pre-cured Gel, Thixotropic Properties
  • Applications:
    • Handheld devices
    • Bare die to heat spreader lid
    • Gap filling between heat-generating devices and heat sinks
    • Low assembly pressure applications
    • High-value assemblies requiring rework
    • BGA, PGA, PPGA
  • Color: Gray
  • Cure Type: Pre-cured (No curing required)
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: 3.5 months (104 days) at 25°C

1. Product Overview

BERGQUIST LIQUI FORM TLF LF3500 is a thermally conductive, one-part liquid formable gel designed for thermal management applications. It is a pre-cured, dispensable gel that offers excellent thermal conductivity and stability.

  • Technology: Silicone
  • Appearance: Gray
  • Cure Type: Pre-cured gel (no curing required)
  • Operating Temperature Range: -60 to 200°C
  • Thermal Conductivity: 3.5 W/m-K
  • Flammability Rating: UL 94 V-0
  • Key Features:
    • No mixing or refrigeration required
    • Stable viscosity
    • Excellent chemical and mechanical stability
    • Low applied stress and long-term reliability

2. Applications

  • Handheld devices
  • Bare die to heat spreader lid
  • Heat-generating components to heat sinks
  • Low-assembly pressure applications
  • High-value assemblies with reworkability
  • BGA, PGA, and PPGA components

3. Typical Properties

Property Value Test Standard
Uncured Material
Density 3.1 g/cc ASTM D792
Shelf Life (at 25°C) 104 days
Cured Material
Dispense Rate 40 g/min
Volumetric Expansion (25–275°C) 200 ppm ASTM E228
Electrical Properties
Dielectric Strength 10,000 V/mm ASTM D149
Dielectric Constant (1,000 Hz) 8.1 ASTM D150
Volume Resistivity 1 × 10¹¹ Ω·m ASTM D257
Outgassing Properties
Total Mass Loss 0.14% ASTM E595
Thermal Properties
Thermal Conductivity 3.5 W/(m-K) ASTM D5470
Thermal Impedance (ASTM D5470)
@ 10 psi 0.07 °C-in²/W
@ 25 psi 0.07 °C-in²/W
@ 50 psi 0.06 °C-in²/W

4. Storage & Handling

  • Storage Temperature: 5 to 25°C
  • Shelf Life: 104 days in sealed containers with moisture barrier
  • Thawing Instructions:
    1. If refrigerated, allow to reach room temperature before use.
    2. Do not open until contents reach 25°C to prevent moisture contamination.

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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