Polyurethane glue is generally considered a very strong adhesive. Here are some key points about the strength of polyurethane glue:
Tensile Strength: Polyurethane glues can have a tensile strength (the maximum stress it can withstand before breaking) of 3,000 to 4,500 psi (pounds per square inch). This is quite high compared to many other common adhesives.
Shear Strength: Polyurethane glue also has excellent shear strength, which is the ability to resist forces that try to push one bonded surface past the other. Shear strength is often in the range of 1,800 to 2,800 psi.
Impact Resistance: Polyurethane glues are known for being tougher and more impact resistant than many other adhesives. This makes them good for applications that experience shock or vibration.
Wood Bonding: When used to bond wood, the wood itself will often fail before the polyurethane glue joint. This demonstrates the glue is stronger than the wood it is bonding.
Gap-Filling: Polyurethane glues can fill gaps up to 1/4 inch wide, which helps it create strong bonds even on imperfectly mating surfaces.
The exact strength can vary depending on the specific polyurethane formula, the materials being bonded, and the application conditions. But in general, polyurethane glue is considered one of the strongest adhesive options available for many DIY and industrial uses.
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