Applications

LOCTITE CB 3626MHF – Epoxy adhesive – Bonding SMD components to PCBs before wave soldering

  • Item Name: LOCTITE CB 3626MHF

  • Manufacturer: Henkel

  • Technologies: Epoxy adhesive (one-component, surface mount adhesive)

  • Color: Red gel-like material

  • Cure Type: Heat cure (≥100 °C, typical 90 sec at 150 °C)

  • Package Size: Contact to Techniq VN for details.

  • Shelf Life: Contact to Techniq VN for details.

1. Product Overview

LOCTITE CB 3626MHF is a one-component, red gel-like epoxy adhesive formulated for surface mount technology. It requires no mixing and cures with heat, providing high strength and reliable bonding of SMD components to printed circuit boards before wave soldering. The adhesive ensures excellent dot size and shape control, supports stencil and syringe dispensing, and delivers strong thermal resistance. With a high glass transition temperature and resistance to hot solder dips, it is suited for robust electronic assembly processes, including lead-free soldering environments.


2. Applications

  • Bonding SMD components to PCBs before wave soldering

  • Component assembly and non-conductive adhesive (NCA) applications

  • Stencil or syringe-dispensed bonding for automated production lines

  • Small parts bonding in electronic assemblies

  • Suitable for both water-based and alcohol-based fluxes in lead-free wave soldering

3. Typical Properties

Property Still Not Mixed (Uncured) After Mixed / Cured
Appearance Red gel-like material Solid epoxy bond line
Technology / Type Epoxy, one-component Crosslinked epoxy adhesive
Yield Point (25 °C) 272 Pa (Cone & Plate Rheometer)
Specific Gravity 1.4
Cure Method Heat cure ≥120 s @ 130 °C or 90 s @ 150 °C
Glass Transition Temperature (Tg) 138 °C
Coefficient of Thermal Expansion (CTE) Below Tg: 48 µm/m·°C; Above Tg: 184 µm/m·°C
Shear Strength (Grit Blasted Steel) 18 N/mm² (≈2,610 psi)
Resistance to Hot Solder Dip Pass (60 s above 260 °C + 10 s dip)
Wave Solder Resistance 100% strength retention after lead-free solder test
Cleaning IPA, MEK, ester blends (uncured) Mechanical removal with heat (cured)
Storage 2–8 °C, unopened container, dry location

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