Problems with Franklin polyurethane glue
Ideas for coping with shorter glue drying times caused by humidity. January 24, 2001
My customers have been having a problem with the reformulation of Franklinís polyurethane glue. In the Florida heat and humidity, the set time has been reduced from 30-40 minutes to 8-12 minutes. Franklin agrees there is a problem, but their attitude is basically, live with it. Any ideas on a poly glue for furniture building that can withstand the heat?
It's the humidity that's causing the glue to kick too soon, although the heat does intensify the problem.
Formulators tell me it's easy to change the reactivity of a polyurethane glue. Just tweak the ratios of the two or three base components.
Excel, at least at one time, was the slowest-acting polyurethane of all. Give it a try, and make sure the lumber is very dry before gluing up, so the only thing that's kicking the glue is the moisture in the atmosphere.
Our shop is climate-controlled year round for proper gluing and finishing conditions. We have humidification in winter and air conditioning with dehumidification in summer. Our goal in summer is to keep the shop below 80 degrees and under 60% humidity.
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: Adhesives, Gluing and Laminating
KnowledgeBase: Adhesives, Gluing and Laminating: Glues and Bonding Agents
KnowledgeBase: Woodworking Miscellaneous
KnowledgeBase: Woodworking Miscellaneous: Woodworking
KnowledgeBase: Knowledge Base
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 © 1996-2017 - WOODWEB ® Inc.