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LOCTITE STYCAST 2850KT CAT 24LV – Epoxy Encapsulant – Heat sink replacement and high voltage electrical applications

  • Item Name: LOCTITE STYCAST 2850KT CAT 24LV
  • Manufacturer: Henkel Corporation
  • Product category: Thermally conductive epoxy encapsulant
  • Technologies: Two-component epoxy system with low CTE, high thermal conductivity, electrical insulation, low viscosity, and excellent adhesion; compatible with various catalysts
  • Applications: Recommended for encapsulating components for heat sink replacement and high voltage applications
  • Color: Blue liquid (resin)
  • Cure type: Room temperature cure and Heat cure
  • Package size: Contact to Techniq VN for details
  • Shelf life: 12 months

1. Product Overview

  • Technology: Epoxy
  • Appearance: Blue liquid
  • Components: Two-component system
  • Mix Ratio:
    • By weight: 100:4 (Material:Catalyst)
    • By volume: 100:11.5 (Material:Catalyst)
  • Key Benefits:
    • High thermal conductivity & electrical insulation
    • Low viscosity, low CTE
    • Excellent adhesion, thermal shock, and impact resistance
    • Excellent low-temperature properties
  • Cure Options: Room temperature & heat cure
  • Operating Temperature: -65 to +105°C

2. Applications

  • Encapsulation for electrical components
  • Heat sink replacement in non-integrated electrical assemblies
  • High voltage applications to prevent surface arching or tracking

3. Typical Properties

Uncured Properties

Property Part A (Resin) Part B (CAT 24LV) Mixed
Viscosity (mPa·s) 165,000 18 22,000
Density (g/cm³) 2.75 2.7
Work Life (100g @ 25ºC, min) 30
Shelf Life (@ 25°C, months) 12

Curing Performance

Cure Condition Time
Room Temp. (25°C) 8-16 hours
Heat Cure (45°C) 2-4 hours
Heat Cure (65°C) 30-60 min
Post Cure (65°C) 2-4 hours

Cured Properties

Property Value
Hardness (Shore D) 92
Flexural Strength (N/mm²) 100 (14,500 psi)
Compressive Strength (N/mm²) 105 (15,200 psi)
Linear Shrinkage (cm/cm) 0.0009
Water Absorption (24h, %) 0.07
Coefficient of Thermal Expansion (10⁻⁶/°C) Alpha 1: 24.3 / Alpha 2: 78.7
Glass Transition Temperature (°C) 40
Thermal Conductivity (W/m·K) 2.29

Electrical Properties

Property Value
Dielectric Strength (kV/mm) 14
Dielectric Constant (@ 1MHz) 6.45
Dissipation Factor (@ 1MHz) 0.048
Volume Resistivity (Ω·cm @ 25°C) >1×10¹⁵

Outgassing Properties (NASA RP 1124, 16h @ 65°C)

Property Value
TML (%) 0.34
CVCM (%) 0.01

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