What is PUR Hot Melt Polyurethane?
Unlike traditional hot melt, which comes in the shape of a stick or pellet, polyurethane hot melt, or PUR hot melt, is heated and dispensed from a cartridge or slug. PUR is also unusual in that it forms a super-strong bond with moisture in the air that will not re-melt.
PUR is perfect for a wide range of applications, including woodworking, finish carpentry, shoe repair, furniture restoration, shattered glassware repair, laminate countertops, construction and renovation, ceramic ceiling tiles, and more, because to its strength, durability, and quick set time.
Polyurethane Reactive Hot Melts: Commonly Asked Questions
ARE PUR HOT MELTS BETTER THAN STANDARD HOT MELTS?
In most cases, polyurethane hot melt provides a stronger bond than regular hot melt. This is due to the fact that the PUR hot melt glue makes a strong initial bond and then strengthens as the adhesive reacts with moisture in the air. The PUR hot melt bonds to the object being glued and to itself in a chemical process known as cross-linking, forming a strong, permanent bond.
WHAT IS THE SOURCE OF THE MOISTURE THAT CONTINUES TO CURE PUR ADHESIVE?
The air and the stuck object are the answers. Although there is enough moisture in the air to continue curing PUR hot melt, drier circumstances may cause open durations to be extended.
HOW CAN I EXTEND THE ADHESIVE’S SHELF LIFE?
The glue should be stored in a foil pouch in a cold, dry location if it has not been used. Rain or moisture should not be allowed to come into contact with the PUR tube. Extrude a one-inch bead of glue before turning off the machine for the day to guarantee that all air has been drained from the tube. CAUTION: When the applicator heat cylinder or cartridge reaches its maximum temperature, do not touch it. Wear gloves at all times.