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LOCTITE® HHD 3542™ – Polyurethane Hot Melt Adhesive – Robotic Dispensing in Electronics Assembly

  • Item Name: LOCTITE® HHD 3542™
  • Manufacturer: Henkel
  • Product Category: Adhesive – Polyurethane Hot Melt
  • Technologies: Reactive Polyurethane Hot Melt
  • Applications: Bonding, robotic dispensing, structural durability
  • Color: Light yellow to amber (uncured)
  • Cure Type: Moisture and Solidification
  • Package Size: Contact Techniq VN for details
  • Shelf Life: Contact Techniq VN for details

1. Product Overview

LOCTITE® HHD 3542™ is a reactive polyurethane hotmelt adhesive designed for robotic dispensing. It has a long open time, solidifies quickly for good initial strength, and undergoes secondary moisture cure for enhanced durability. Once fully cured, it does not remelt.

2. Applications

  • Bonding applications requiring high elongation and structural durability
  • Suitable for robotic dispensing
  • Bonds materials like anodized aluminum and PC/ABS plastics

3. Typical Properties

Property Value
Uncured Properties
Specific Gravity @ 25°C 1.1
Viscosity (Brookfield, 100°C) 3,500 – 7,500 mPa.s
Flash Point See SDS
Curing Characteristics
Open Time @ 25°C (1mm bead) < 4 minutes
Application Temperature 90 – 110°C
Cured Properties
Glass Transition Temperature (Tg) -39°C
Coefficient of Thermal Expansion (Pre Tg) 130 x 10⁻⁶ K⁻¹
Coefficient of Thermal Expansion (Post Tg) 340 x 10⁻⁶ K⁻¹
Hardness (Shore D) 30
Thermal Conductivity 0.21 W/(m.K)
Elongation at Break 860%
Tensile Modulus 91 N/mm² (13,225 psi)
Tensile Strength >8 N/mm² (>1,225 psi)
Electrical Properties
Dielectric Constant (1,000 KHz) 3.48

4. Performance on Different Materials

Test Substrate Strength (N/mm² / psi)
Lap Shear Strength Anodized Aluminum 7.2 / 1,045
PC/ABS 4.8 / 695
Cross Bond Tensile Loading Strength Anodized Aluminum 4.8 / 695
PC/ABS 5.8 / 840

5. Environmental Resistance

Condition Aluminum (N/mm² / psi) PC/ABS (N/mm² / psi)
85°C / 85% RH (7 days) 3.9 / 570 4.5 / 800
Thermal Cycling 7.2 / 1,040 6.4 / 935
Heat Shock 6.0 / 865 5.3 / 775

6. Chemical Resistance

Chemical Exposure Retention of Strength (%)
Air (87°C, 500h/1000h) 150 / 150
Motor Oil (87°C, 500h/1000h) 115 / 110
Isopropanol (22°C, 500h/1000h) 90 / 85
Water (22°C, 500h/1000h) 115 / 150
Water/Glycol (87°C, 500h/1000h) 130 / 140

BERGQUIST microTIM mTIM 1028 Thermal Interface Coating High performance thermal management solution for nickel finished heat sinks, optical transceivers, and data center liquid cooling systems

BERGQUIST microTIM mTIM 1028 is purpose built for riding cage assemblies in servers, switches, and routers, interfacing with electroless nickel plated copper or aluminum heat sinks. It ensures stable operation in high power transceiver modules while also extending applicability to liquid cooling components, heat pipes, and fin based dissipative structures.

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