PUlijm

PU-lijm, or polyurethane glue, is an adhesive based on polyurethane polymers. It is typically a one-component, moisture-curing glue, though two-component variants exist for specialized applications. On exposure to moisture from the air or the substrate, it polymerizes and forms a strong, durable bond.

Key properties include high bonding strength to wood, stone, concrete, metal, and many plastics, as well as good gap-filling abilities. It often foams slightly during curing, which can help fill irregular joints but may cause squeeze-out. PU-lijm adheres well to rough or porous surfaces and to many non-porous materials, but it performs poorly on low-energy plastics and surfaces like polyethylene, polypropylene, or silicone.

Common uses encompass woodworking, cabinetry, tile setting, furniture assembly, and general construction. It bonds a wide range of materials and is valued for its versatility, moisture resistance, and ability to fill gaps. It may require clamping to achieve the best bond, especially where precise alignment is needed. Curing times vary by product and conditions but typically range from several hours to a full 24–72 hours for maximum strength.

Application tips include preparing clean, dry surfaces, lightly dampening porous substrates to speed cure, applying a bead of adhesive, assembling, and clamping firmly. Avoid excessive foaming in tight joints and wipe away squeeze-out before it sets.

Safety and handling: PU-lijm contains reactive isocyanates and can irritate skin, eyes, and lungs. Use in well-ventilated areas, wear gloves and eye protection, and follow label instructions. Store in a cool, dry place in the original container.