LOCTITE® HHD 3542

Features and Benefits

One-part hot melt polyurethane-based bonding adhesive explicitly designed for robotic dispensing.
If you’re looking for a reactive hot melt adhesive for your robotic dispensing needs, LOCTITE® HHD 3542 is the ideal choice. This medium-viscosity bonding adhesive is based on polyurethane prepolymers and offers strong bonding capabilities and a relatively long open time. Immediately after solidifying in the bond line, the adhesive provides good initial strength. Then, the secondary moisture cure cross-links the bonds for excellent elongation and structural durability. When fully cured, LOCTITE® HHD 3542 doesn’t remelt.
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Technical Information

Application method Extrusion, Hot applied
Color Off white
Cure type Heat cure
FEA (finite element analysis) Finite strain, Viscoelastic
Key characteristics Chemical resistant, Elongation: high elongation, Environmental resistance, Open time: medium open time, Reactive, Urethane based
Number of components 1 part
Open time, @ 25.0 °C 1 mm bead 4.0 min.
Operating temperature 90.0 - 110.0 °C
Recommended for use with Acrylonitrile butadiene styrene (ABS), Metal: aluminum, Polycarbonate
Viscosity, Brookfield - Thermosel, @ 100.0 °C Spindle 27 3500.0 - 7500.0 mPa·s (cP)