• Item Name: LOCTITE® HHD 3612BK
• Manufacturer: Henkel
• Technologies: Polyurethane Hot Melt
• Color: Black Solid
• Cure Type: Solidification and Moisture
• Package Size: Contact to Techniq VN for details.
• Shelf Life: Contact to Techniq VN for details.
LOCTITE® HHD 3612BK is a black, one-component polyurethane hot-melt adhesive that cures through solidification and moisture. Designed for robotic jetting and automatic assembly lines, it provides fast initial strength and a secondary moisture cure that enhances elongation and structural durability. Once fully cured, the adhesive will not remelt.
Device assembly
Gap filling
Bonding
Not Mixed / Uncured
| Property | Value |
|---|---|
| Technology | Polyurethane Hot Melt |
| Appearance | Black Solid |
| Components | One part – no mixing required |
| Solids Content | 100% |
| Viscosity (Brookfield, Thermosel, 110 °C, mPa·s) | 4,500 |
| Flash Point | See SDS |
Curing Performance / After Application
| Property | Value |
|---|---|
| Cure Mechanism | Moisture |
| Open Time @ 25 °C | ≥3 minutes |
| Preheating Schedule | 20–30 minutes @ 110 °C |
| Application Temperature | 100–120 °C |
| Handling Strength | High immediately after bonding |
| Final Strength Development | 1–7 days, depending on humidity, substrate moisture, permeability, and adhesive layer thickness |
Cured Material Properties
| Property | Value |
|---|---|
| Transmittance (0.2 mm @ 550 nm) | 0.15% |
| Elongation at Break | 784% |
| Modulus | 122 N/mm² (17,700 psi) |
| Cross Tensile Strength (2h, 25 °C, 60% RH) | PBT/40% Glass: 1.5 N/mm² (218 psi) AnAl: 2.0 N/mm² (290 psi) |
| Cross Tensile Strength (24h, 25 °C, 60% RH) | PBT/40% Glass: 4.1 N/mm² (595 psi) AnAl: 8.0 N/mm² (1,160 psi) |
| Lap Shear Strength (24h, 25 °C, 60% RH) | PBT/40% Glass: 6.4 N/mm² (928 psi) AnAl: 5.5 N/mm² (798 psi) |
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