Applications

LOCTITE 3616 – Red epoxy adhesive for bonding SMDs to PCBs before wave soldering in electronics.

  • Item Name: LOCTITE 3616
  • Manufacturer: Henkel
  • Product Category: Surface mount adhesive
  • Technologies: Epoxy
  • Applications: Bonding SMD components to PCBs and small parts; optimized for stencil printing with high wet strength and fast cure
  • Color: Red viscous paste
  • Cure Type: Heat cure
  • Package Size: Contact Techniq VN for details.
  • Shelf Life: Contact Techniq VN for details

1. Product Overview

  • Technology: Epoxy
  • Chemical Type: Epoxy
  • Appearance: Red viscous paste
  • Components: One-component (no mixing required)
  • Cure Method: Heat cure
  • Application: Surface mount adhesive
  • Key Substrates: SMD components to PCB
  • Other Uses: Small parts bonding
  • Dispense Method: Stencil print
  • Wet Strength: High

2. Applications

  • Bonding surface-mounted devices (SMD) to printed circuit boards (PCB) before wave soldering
  • Suitable for printing a range of dot heights with one stencil thickness
  • Designed for high wet strength and fast print speeds

3. Typical Properties

Uncured Properties
Property Value
Specific Gravity (25°C) 1.33
Yield Point (Pa) 250 – 650
Casson Viscosity (Pa·s) 15 – 55
Flash Point See SDS
Curing Performance
  • Recommended cure: 90-120 sec at 150°C
  • Isothermal DSC Conversion: 95-100% at 125°C (5 min)
Cured Properties (30 min @ 150°C)
Property Value
Coefficient of Thermal Expansion (K⁻¹) 86 × 10⁻⁶
Thermal Conductivity (W/m·K) 0.2
Specific Heat (kJ/kg·K) 0.3
Density (g/cm³) 1.3
Glass Transition Temperature (°C) 140
Electrical Properties
Property Value
Dielectric Constant (1 kHz) 2.8
Dielectric Breakdown Strength (kV/mm) 33.5
Volume Resistivity (Ω·cm) 4.6 × 10¹⁵
Surface Resistivity (Ω) 28 × 10¹⁵
Adhesive Properties
Test Value
Lap Shear Strength (Steel, 150°C, 30 min) ≥ 15 N/mm² (≥ 2175 psi)
Pull-off Strength (C-1206, 125°C, 5 min) 46 N (10.3 lb)
Torque Strength (C-1206, 150°C, 3 min) 54 N·mm (7.6 in.oz)
Push-off Strength (C-1206, 150°C, 3 min) ≥ 30 N (≥ 6.7 lb)
Environmental Resistance (Lap Shear Strength @ 150°C, 30 min)
Condition % Strength Retention
Air (22°C) 100%
98% RH (40°C) 80-90%
Resistance to Hot Solder Dip (150°C, 90 sec)
  • Pass: 60 sec at 260°C solder bath + 10 sec dip

4. Storage & Handling

  • Store in sealed container at 2°C to 8°C
  • Do not return used material to the original container
  • Allow to reach room temperature before use (2-4 hours)
  • Optimal printing conditions: 25°C, RH < 70%

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