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Polyurethane Adhesive

Polyurethane Adhesive

Polyurethane adhesive is what you commonly call the 'super glue'. It is believed to be stronger than yellow glue, but there are many woodworkers who would disagree.
Rohini Mohan
Polyurethane adhesive is a glue. It is a thermoplastic substance or a polymer that contains replicas of organic chain units that are linked to urethane links. The chemical reaction of polyurethane polymer results in the creation of this adhesive, which is extremely strong and resistant to most forms of deterioration. This adhesive's super bonding properties makes it the most popular product of choice for industrial and construction purposes. Though there is a wide range of polyurethane glue available in the market today, not all of them are of the same quality because the chemical composition can be modified to give these adhesives varied levels of density and consistency.
Properties of Polyurethane Adhesive
  • Completely water-resistant.
  • Resistant to harsh alkaline as well as acidic chemicals. Which means that this adhesive does not disintegrate or dissolve when brought in contact with such chemicals.
  • Very low viscosity.
  • Malleable at room temperature which allows it to easily spread over surfaces.
  • This glue sticks within seconds and thus, has a very low curing time. It sticks to surfaces and bonds them rapidly.
  • This adhesive is extremely heat-resistant and remains stable in temperatures as high as 100 degrees Celsius.
  • The flexibility of this adhesive allows it to absorb shock and vibrations. Thereby, making it suitable for constructing buildings and furniture.
Uses of Polyurethane Glue
  • This adhesive is most commonly used in shoe manufacturing industries for binding soles to leather and synthetic uppers.
  • It is used in the construction of buildings and houses.
  • It is used for joining Polyvinyl Chloride (PVC), Ethylene Vinyl Acetate (EVA), and Thermal Plastic Rubber( TPR).
  • It is also used for laminating polyester.
  • It is used for shrinking films in rotogravure printing techniques.
  • Most commonly used as woodworking glue, this adhesive caulk is sold as a gel and in cartridges. It is used by light industries, and for household repairs such as for fixing furniture, boats, ceramic objects, plywood, and almost any other item.
  • Polyurethane construction adhesive also binds materials such as glass, all types of metals, concrete, and plastic.
  • It is largely used in paper binding industries in order to bind books.
  • It is also used for bonding different types of textiles as well as for making needle punches.
  • It binds extremely well with linoleum, polystyrene, and polyurethane panels.
This adhesive is difficult to remove as it creates a permanent bond with the other surface. Acetone being a chemical solvent, is excellent for removing this adhesive. All you have to do is, apply undiluted acetone in between the two surfaces and leave it for at least 10-15 minutes. Once the solvent had seeped in, it will gradually dissolve the adhesive and loosen its grip.
Polyurethane glue can be used for fixing tough surfaces and objects as it sticks to almost anything! It is excellent for masonry stone works as well as for fixing broken automobile parts. Heavy-duty industry adhesive is 25% stronger and more effective as compared to commercially sold ones. The only disadvantage of industrial adhesive is that it takes a bit longer to firmly stick surfaces together.