The Truth About Polyurethane Glue Popular Woodworking Magazine

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First, a bit historical past. It could be a mistake to name polyurethane glues “new. ” Polyurethanes were trendy in Europe for a long time and were first imported to the US and Canada about six years ago by the Gorilla Group which sells Gorilla Glue and AmBel Corp. which sells Excel.

Pretty soon the big glue manufacturers took notice and introduced their very own lines of polyurethane glue. So now we have six polyurethane adhesives to choose from — though glue industry insiders imply that the polyurethane market is crowded and that number might soon drop. But that’s another story. Here, in a nutshell, is what you want to learn about polyurethane glue. Dale Zimmerman, a technical specialist with Franklin International, which manufactures Titebond Polyurethane Glue, says that his company’s tests don’t show that polyurethane glue is any improved than yellow glue. Here’s how they tested the adhesives: They glued together 1″ square blocks of hard maple using a long grain to long grain joint — the most powerful type of glue joint for wood.

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Then they attempted to break the blocks apart by trying out the joint’s shear strength, which in fact means they tried to break the bond by pushing one block up while pushing the other block down.

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