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LOCTITE STYCAST U 2500 HTR – Polyurethane Encapsulant – Potting and encapsulation for transformers, PCBs, insulating applications

  • Item Name: LOCTITE STYCAST U 2500 HTR
  • Manufacturer: Henkel
  • Product Category: Potting and Encapsulation Compound
  • Technologies: Polyurethane
  • Applications: Designed for potting and encapsulation of transformers, PCBs, and other insulating applications.
  • Color: Resin is black; Hardener is amber
  • Cure Type: Room Temperature or Heat Cure
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: Approximately 6 months (183 days)

1. Product Overview

LOCTITE STYCAST U 2500 HTR is a two-component polyurethane encapsulant designed for potting and encapsulation applications. It has low viscosity, low modulus, high-temperature resistance, and excellent wetting properties. This material is formulated to provide complete impregnation for both small wound coils and large castings and can serve as a silicone replacement.

2. Applications

  • Potting and encapsulation
  • Transformers
  • PCB insulation
  • Other electrical and electronic insulating applications

3. Typical Properties

Before Mixing

Property Part A Part B
Appearance Black Amber
Viscosity @ 25°C (mPa∙s) 12,500 135
Density (g/cm³) 1.42 1.23

After Mixing

Property Value
Mixed Viscosity @ 25°C (mPa∙s) 8,000
Pot Life @ 25°C (hours) 4
Shelf Life @ 18-25°C (days) 183

Curing Conditions

Cure Condition Time
Room Temp Cure 24 hours @ 25°C
Heat Cure 4 hours @ 60°C
Post Cure 2 hours @ 100-120°C

Cured Material Properties

Property Value
Hardness (Shore A) 75
Glass Transition Temperature (°C) -50
Thermal Conductivity (W/m-K) 0.5
Coefficient of Thermal Expansion (ppm/°C) 134
Moisture Absorption (%) 0.6 (@ 24°C, 24h)
Elongation (%) 66
Young’s Modulus (N/mm²) 10 (1,450 psi)

Electrical Properties

Property Value
Volume Resistivity (ohm-cm) 1.7×10¹²
Surface Resistivity (ohms) 1.9×10¹³
Dielectric Constant @ 25°C 7.0 (50Hz), 7.1 (1kHz), 6.0 (1MHz)

Mechanical Strength

Property Value
Lap Shear Strength (Al to Al) 6 N/mm² (870 psi)
Tensile Strength 4 N/mm² (580 psi)

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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