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LOCTITE STYCAST US 5544 – Polyurethane Potting Compound – Fast gelling, flame retardant encapsulation for electronics

  • Item Name: LOCTITE STYCAST US 5544
  • Manufacturer: Henkel
  • Product Category: Potting and Encapsulating Compound
  • Technologies: Urethane
  • Applications: Fast-setting potting compound ideal for encapsulation, offering flexibility and flame retardant properties.
  • Color: Opaque white (mixed appearance)
  • Cure Type: Room temperature cure
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: Contact Techniq VN for details.

1. Product Overview

LOCTITE STYCAST US 5544 is a fast-gelling, flexible, flame-retardant, mineral-filled polyurethane compound used for potting and encapsulation. It offers low viscosity, strong adhesion, and fast setting while being low odor and free from TDE or mercury compounds.


2. Applications

  • Potting and encapsulating applications
  • Adheres well to various substrates
  • Used in electronic and electrical components

3. Typical Properties

Uncured Properties

Property Part A Part B Mixed
Appearance Clear brown Opaque white Opaque white
Density (g/cm³) 1.23 1.46 1.4
Viscosity @ 23°C (cps) 75 11,000 2,000
Mix Ratio (by weight) 15 85
Mix Ratio (by volume) 1 4.81
Gel Time (min) 4 to 6
Working Time (min) 2 to 3

Curing Performance

Cure Condition Time
Room temperature 2 to 4 hours @ 23°C
Heat cure 30 minutes @ 60–85°C

Cured Properties

Property Value
Shore Hardness (Durometer A) 79 – 89
Thermal Conductivity (W/m-K) 0.335
Weight Loss (168 hrs @ 130ºC) 0.19%
Moisture Absorption (24 hrs) 0.15%
Linear Shrinkage (%) 0.12%
Coefficient of Thermal Expansion (ppm/°C) α1: 114 (-40 to 25°C)
α2: 155 (25 to 125°C)
Tensile Strength (psi) 1,320
Flammability (UL 94) 9.52mm: V-0
6.35mm: V-2

Electrical Properties

Property Value
Dielectric Strength (V/mil) >400
Dielectric Constant (100Hz) 3.85
Dissipation Factor (100Hz) 0.02
Volume Resistivity (Ω·cm) 3.6 × 10¹³

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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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