• Item Name: LOCTITE® HHD 4052
• Manufacturer: Henkel
• Technologies: Urethane-acrylate
• Color: Viscous black liquid
• Cure Type: Ultraviolet (UV) light; moisture cure
• Package Size: Contact to Techniq VN for details.
• Shelf Life: Contact to Techniq VN for details.
LOCTITE® HHD 4052 is a single-component urethane-acrylate adhesive designed for device assembly applications. It cures through a dual mechanism: initial exposure to UV light (350–405 nm) creates a PSA-like tack, followed by moisture curing over 72 hours to achieve full strength. Supplied as a viscous black liquid, it provides excellent flexibility, elongation, and strong adhesion to common electronic substrates.
Structural bonding in handheld and portable electronic devices.
Assemblies requiring UV-initiated handling strength with full cure by moisture.
Suitable where fast production cycles and durable adhesion are essential.
| Property | Still Not Mixed (Uncured) | After Cured (UV + 3 days moisture @ RT, 50% RH) |
|---|---|---|
| Appearance | Viscous black liquid | Solid adhesive film |
| Viscosity (50 °C, PP25) | 55,000 mPa·s | – |
| Specific Gravity | 1.1 g/cm³ | – |
| Aspect Ratio | >50% | – |
| Pot Life | 8 h @ 50 °C | – |
| Cure Mechanism | UV (350–405 nm) + moisture | Dual cure completed |
| UV Exposure | 1,000 mW/cm² for 3 s | PSA-like tack achieved |
| Moisture Cure | – | 72 h @ 25 °C, 50% RH |
| Coefficient of Thermal Expansion | – | 160 ppm/°C (below Tg), 480 ppm/°C (above Tg) |
| Glass Transition Temperature (Tg) | – | 30 °C |
| Storage Modulus (DMA) | – | 50 N/mm² @ 25 °C |
| Elongation | – | 450% |
| Lap Shear Strength | – | >5.0 N/mm² (SUS to SUS) |
The adhesive offers long open time, high elongation, and strong structural integrity once fully cured, making it well-suited for handheld device assemblies where both speed and durability are required.
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