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LOCTITE STYCAST 2851FT – Epoxy Encapsulant – Encapsulation of components requiring heat dissipation, thermal shock resistance, and chemical durability

  • Item Name: LOCTITE STYCAST 2851FT
  • Manufacturer: Henkel Corporation
  • Product category: Epoxy Encapsulant
  • Technologies: One-component, solvent-free, 100% solids epoxy technology
  • Applications: Designed for encapsulating electronic components requiring efficient heat dissipation and resistance to thermal shock.
  • Color: Black
  • Cure type: Heat cure
  • Package size: Contact to Techniq VN for details
  • Shelf life: 6 months

1. Product Overview

LOCTITE STYCAST 2851FT is a one-component, solvent-free epoxy encapsulant designed for heat dissipation and thermal shock resistance. It features:

  • Low-temperature cure
  • High thermal conductivity (1.36 W/m-K)
  • Low coefficient of thermal expansion
  • Excellent resistance to industrial chemicals and solvents

2. Applications

Recommended for encapsulation of components requiring:

  • High thermal conductivity
  • Thermal shock resistance
  • Low expansion properties

3. Typical Properties

Uncured Properties Value
Viscosity @ 25°C 85,000 mPa·s
Viscosity @ elevated temp 33,000 mPa·s
Density 2.3 g/cm³
Shelf Life (0 to 8°C) 180 days
Cure Schedule
  • 1 hour @ 120°C
  • 2 hours @ 110°C
  • 5 hours @ 90°C
  • Post-cure (optional): 4 hours @ 150°C for improved properties
Cured Properties Value
Hardness (Shore D) 90 min
Thermal Conductivity 1.36 W/m-K
Coefficient of Thermal Expansion 31 ppm/°C
Moisture Absorption (24h) 0.06%
Heat Distortion Temperature 102°C
Arc Resistance 207 sec
Mechanical & Electrical Properties
Property Value
Impact Strength 0.16 J/cm
Compressive Strength 130 N/mm² (18,855 psi)
Flexural Strength 93 N/mm² (13,488 psi)
Tensile Strength 50 N/mm² (7,250 psi)
Volume Resistivity @ 25°C 1×10¹⁵ ohm-cm
Dielectric Constant (1 MHz) 5.2
Dissipation Factor (1 MHz) 0.02

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