Applications

LOCTITE ABLESTIK 561K

  • Item Name: LOCTITE ABLESTIK 561K
  • Manufacturer: Henkel
  • Product Category: Epoxy Film Adhesive
  • Technologies: Thermally conductive, flexible for bonding mismatched adherends, reworkable, passes NASA outgassing
  • Applications: Substrate attach, heat sink bonding
  • Color: White
  • Cure Type: Heat cure (30 min @ 150°C or 2 hours @ 125°C)
  • Package Size: Contact Avantek for details.
  • Shelf Life: 12 months (at -40°C)

1. Product Overview

LOCTITE ABLESTIK 561K is a thermally conductive epoxy film designed for substrate attach and heat sink bonding. It is reworkable and passes NASA outgassing standards. The adhesive is flexible, allowing it to bond materials with mismatched coefficients of thermal expansion.

2. Applications

  • Substrate attachment
  • Heat sink bonding
  • Ideal for severely mismatched materials

3. Typical Properties

Property Value
Technology Epoxy Film
Appearance White
Carrier Type Glass fabric
Film Thickness 100 to 305µm (depending on carrier)
pH 8
Work Life @ 25°C 183 days
Shelf Life @ -40°C 365 days
Curing Conditions
Cure Schedule Conditions
Standard Cure 30 min @ 150°C
Alternate Cure 2 hours @ 125°C
Cured Properties
Property Value
Glass Transition Temperature (Tg) 55°C
Thermal Conductivity 0.9 W/(m-K) @ 121°C
Coefficient of Thermal Expansion 85 ppm/°C (Below Tg), 300 ppm/°C (Above Tg)
Lap Shear Strength (Al-Al @ 25°C) 23 N/mm² (3,300 psi)
Lap Shear Strength (Au-Au @ 25°C) 26 N/mm² (3,700 psi)
Electrical Properties
Property Value
Volume Resistivity 9.1 × 10¹² ohm-cm
Dielectric Strength 820 V/µm
Dielectric Constant @ 1kHz 5.7
Dissipation Factor @ 1kHz 0.012
Environmental Performance
Property Value
Water Extract Conductivity 110 µmhos/cm
Weight Loss @ 300ºC 0.34%
Moisture Absorption @ 85°C/85%RH 0.9%

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