• Item Name: LOCTITE HHD 3577
• Manufacturer: Henkel
• Technologies: Polyurethane Hot Melt
• Color: Light yellow to amber
• Cure Type: Moisture cure, pressure sensitive
• Package Size: Contact to Techniq VN for details.
• Shelf Life: Contact to Techniq VN for details.
LOCTITE® HHD 3577 is a polyurethane-based reactive hot melt adhesive, supplied in light yellow to amber form. It is pressure sensitive, offering instant high handling strength upon bonding, while remaining reworkable for process adjustments. The adhesive cures by ambient moisture, achieving final strength within 1–5 days. It is characterized by 100% solids content, excellent bonding performance, and balanced open time, making it adaptable for both manual and automated assembly lines.
Device assembly requiring instant handling strength and reworkability.
Structural bonding for durable, moisture-cured adhesive joints.
Automated or manual assembly lines benefiting from controlled open time and stable processing.
| Property | Still Not Mixed (Uncured) | After Mixed | After Cured |
|---|---|---|---|
| Appearance | Light yellow to amber | – | – |
| Technology | Polyurethane Hot Melt | – | – |
| Solids Content | 100% | – | – |
| Cure Method | Moisture | – | – |
| Viscosity @ 100 °C (Spindle 27) | 6,500 mPa·s | – | – |
| Density @ 25 °C | 1.1 g/cm³ | – | – |
| Flash Point | See SDS | – | – |
| Open Time @ 25 °C | ~2 min | – | – |
| Preheating Schedule | 20–30 min @ 100 °C | – | – |
| Application Temperature | 90–110 °C | – | – |
| Strength Development | – | – | High handling strength instantly; final strength in 1–5 days |
The adhesive offers a unique balance of pressure sensitivity, immediate strength, and reworkability, making it highly effective for precision device assembly and structural bonding under varied environmental conditions.
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