Wood Magazine 157 by Bill Krier

Author:Bill Krier
Language: eng
Format: epub
Tags: Wood, Home and hobby woodworker
Publisher: Meredith Corporation
Published: 2004-03-25T05:00:00+00:00

Elmer's Carpenter's interior

Elmer's ProBond Interior

to Loctite Professional Wood Worx Q. Titebond Original

Titebond Extend

Titebond Molding &Trim

*2 Elmer's CarpenterlTExterior

"■ Elmer's Carpenter's ProBond Interior/Exterior

■2 Loctite Outdoor Wood Worx

ei»,

<U Titebond II

■2 Titebond II Extend Titebond III

Elmer's ProBond Ultimate

Gorilla Glue

Titebond Polyurethane

200 400 600 800 1.000 1,200 1,400

Pressure required to break joint (PSI)

1,600 Wood Failure

Three major

sticking points for glues

So, what qualities are important when it comes to putting your projects together and deciding which glue to buy? Here are the top three in our book.

1 Strength of bond. Our first test was joining edge grain to edge grain (as when gluing up a tabletop or panel), and with virtually every glue, the wood broke before the glue joint. The only exception was Titebond Polyurethane, which failed under a respectable average of 1,650 psi of shearing pressure. Titebond's Dale Zimmerman told us, "Polyurethane glues would normally be expected to produce wood failure in this type of assembly," but also noted, "the dependence of the polyurethane glues on moisture for curing means that differences in the moisture levels present could affect the quality of the bonds achieved."

Next, we made edge-grain to end-grain joints, such as those between the rails and stiles on a face frame. Because of the way end grain drinks in liquid, we didn't expect any of the glues to do well here. However, as you can see from the chart at left, four glues—Elmer's ProBond Interior and Pro-Bond Interior/Exterior. Loctite Professional Wood Worx, and Titebond Molding and Trim—proved stronger than the wood here too. Polyurethanes, as a group, failed under

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