• Item Name: LOCTITE® HHD 3542™
• Manufacturer: Henkel
• Technologies: Polyurethane Hot Melt (Reactive Polyurethane)
• Color: Light yellow to amber solid
• Cure Type: Moisture and solidification
• Package Size: Contact to Techniq VN for details.
• Shelf Life: Contact to Techniq VN for details.
LOCTITE® HHD 3542™ is a reactive polyurethane hot melt adhesive designed for robotic dispensing. Presented as a light yellow to amber solid, it offers medium viscosity and cures through both solidification and subsequent moisture cross-linking. The adhesive provides immediate green strength upon cooling, followed by durable structural performance after full cure. Notably, once cured, the adhesive does not remelt, ensuring stability under thermal stress.
Automated or robotic bonding processes requiring precision application
Structural bonding where long open time and robust elongation are critical
Electronics and assembly applications needing thermal stability, flexibility, and environmental resistance
| Property | Still Not Mixed (Uncured) | After Cured (7 days @ 22 °C, 50% RH) |
|---|---|---|
| Appearance | Light yellow to amber solid | Solid elastomer |
| Specific gravity @ 25 °C | 1.1 | – |
| Viscosity (100 °C, Spindle 27) | 3,500–7,500 mPa·s | – |
| Cure mechanism | Solidification + moisture cure | Fully cross-linked |
| Open time (25 °C, 1 mm bead) | < 4 min | – |
| Application temperature | 90–110 °C | – |
| Glass transition temperature (Tg) | – | -39 °C |
| Thermal expansion (pre-Tg / post-Tg) | – | 130 ×10⁻⁶ / 340 ×10⁻⁶ K⁻¹ |
| Hardness (Shore D) | – | 30 |
| Elongation at break | – | 860 % |
| Tensile modulus | – | 91 N/mm² (13,225 psi) |
| Tensile strength | – | > 8 N/mm² (>1,225 psi) |
| Lap shear strength | – | 7.2 N/mm² (Al anodised), 4.8 N/mm² (PC/ABS) |
| Dielectric constant (1,000 kHz) | – | 3.48 |
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Techniq Vietnam provides end-to-end materials and process solutions, integrating world-class technologies in adhesives, soldering, and thermal management.
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