Applications

LOCTITE® 3629C – Surface Mount Adhesive for PCB Assembly

Item Name: LOCTITE® 3629C
Manufacturer: Henkel
Technologies: Epoxy
Color: Red
Cure Type: Heat cure
Package Size: Contact to Avantek for details.
Shelf Life: Contact to Avantek for details.

1. Product Overview

LOCTITE® 3629C is a red, one-component epoxy designed for surface mount adhesive applications in PCB assembly. It is halogen-free, fast-curing, and offers high thermal mechanical strength. It is optimized for high-speed dispensing.

2. Applications

  • Bonding surface-mounted devices (SMDs) to PCBs before wave soldering
  • Suitable for high-speed dispensing with controlled dot size and shape

3. Typical Properties

Uncured Properties

Property Value
Yield point (25°C), Pa·s 165
Specific gravity 1.38
Flash point See SDS
Pot life (25°C) 7 days

Curing Performance

  • Minimum 150 sec at 120°C or 90 sec at 150°C
  • Final strength depends on PCB type, ramp-up temperature, and residence time

Cured Properties

Property Value
Coefficient of Thermal Expansion (CTE) (ppm/°C) Below Tg: 45, Above Tg: 144
Glass Transition Temperature (Tg) (°C) ≥118
Density (g/cm³) 1.4
DSC Onset (°C) 82
DSC Peak (°C) 120

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