Glue for Borax Treated Board
Wood that has been treated with borate-based chemicals interacts with water-based glue in a way that interferes with the bond. July 28, 2012
I have some old Medite-FR (fire retardant) that has been treated with Borax. Apparently the borax sucks the moisture out of the glue before the PVA glue has a chance to set. SierraPine has since changed their formulation for the FR, but I'm still stuck with the old stuff. Does anyone have any recommendations for glue?
From contributor P:
We've run into this a lot lately and the key is to do a little surface prep. There's really no adhesive available that won't react with the Borax but if you wipe the surface with a moist towel and use a little heavier spread the panel usually comes out just fine.
From the original questioner:
We did a pretty thorough prep on the board as it was totally covered with Borax (and probably other unknown mineral salts) and the laminate (simple white liner) just lifted right off. Not even close to sticking. Most of the glue stuck to the liner but hardly any to the board. If we use contact cement, that will telegraph through the thin liner.
From contributor C:
If you are hot pressing, try a urea resin glue. Thatís what we do, and you need to run at 90-100 C. It's not a water-based glue like PVA.
From contributor P:
Urea Resin is a water-based adhesive. Borax does not react with it the way it reacts with PVA but it does react. It changes the pH level of the glue and causes it to cure much more slowly. This can be overcome in a hot press but the operator should be aware of the possible need for increased press times.
Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?
Have you reviewed the related Knowledge Base areas below?
KnowledgeBase: Knowledge Base
KnowledgeBase: Adhesives, Gluing and Laminating
KnowledgeBase: Adhesives, Gluing and Laminating: Glues and Bonding Agents
All rights reserved. No part of this publication may be reproduced in
any manner without permission of the Editor.
Review WOODWEB's Copyright Policy.
The editors, writers, and staff at WOODWEB try to promote safe practices.
What is safe for one woodworker under certain conditions may not be safe
for others in different circumstances. Readers should undertake the use
of materials and methods discussed at WOODWEB after considerate evaluation,
and at their own risk.
335 Bedell Road
Montrose, PA 18801
Copyright © 1996-2019 - WOODWEB ® Inc.