Applications

LOCTITE® HHD 3591WH – Polyurethane hot melt adhesive for structural bonding in electronics and devices

Item Name: LOCTITE® HHD 3591WH
Manufacturer: Henkel
Technologies: Polyurethane hot melt
Color: White
Cure Type: Solidification and moisture
Package Size: Contact to Techniq VN for details.
Shelf Life: Contact to Techniq VN for details.

1. Product Overview

LOCTITE® HHD 3591WH is a one-component, reactive polyurethane hot melt adhesive. It is supplied as a white solid with slight odor and 100% solids content. The adhesive cures through solidification and moisture reaction, providing high adhesion strength and low modulus. It is suitable for both automatic and manual assembly processes, including under-screen bonding and waterproof sealing of foldable phones. Key features include low bubble formation, good pressability, and strong adhesion.


2. Applications

  • Structural bonding in electronic assemblies

  • Under-screen bonding for foldable phones

  • Waterproof sealing applications

  • Compatible with automatic or manual assembly processes

3. Typical Properties

Uncured

Property Value
Technology Polyurethane hot melt
Appearance White
Solids Content 100%
Viscosity @ 110 °C, Brookfield Thermosel, mPa·s 3,500–6,500
Open Time @ 110–130 °C 4 min
Preheating Temperature/Time 110 °C, 20–30 min

Cured

Property Value
Cure Moisture-cured, full strength in 1–3 days
Lap Shear Strength (ANAL6013-Al) >2 MPa (24 h)
DMA Modulus <1 MPa (7 days @ 25 °C, 50% RH)
Shore A Hardness <20
Elongation >500 %

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