Structural construction adhesives

Structural polyurethane adhesives are used in civil construction and modern industrial construction to replace or complement mechanical fixings in multiple applications: bonding of sandwich panels, fixation of facade elements, assembly of structural frames, bonding of cross-laminated timber elements (CLT/GLULAM), wood flooring installation, fixation of pre-fabricated components.

The global construction trend is industrialization and pre-fabrication — buildings assembled from factory-produced components and bonded/bolted on-site. Structural PU adhesives play a critical role in this trend by offering a unique combination of flexibility (accommodating thermal and structural movement), strength (bonding force sufficient for structural loads) and field applicability (fast cure, humidity tolerance, robotic or manual application).

1K moisture-cure systems are the most popular in field — ready for use, application by tube/cartridge, cure happening in 24 to 72 hours. 2K systems offer faster cure and higher final resistances, but require controlled mixing. HMPUR (Hot Melt Reactive PU) is used in automated manufacturing lines where cycle time is critical.