Expanding Polyurethane Glue: A Comprehensive Review for Gap Filling Applications

introduction expanding polyurethane (pu) glue is a single-component or multi-component adhesive that cures via a chemical reaction, resulting in a rigid foam with excellent bonding and gap-filling properties. its ability to expand during the curing process allows it to effectively fill irregular gaps and voids, providing strong adhesion to a variety of substrates. this characteristic makes it a versatile material widely used in construction, insulation, automotive,…