Darryl Keil Last Activity 2025-09-09 11:09 AM
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Tim

Posts: 35

Joined: 2007-06-26
Location: Baltimore MD

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Subject : Off gassing of Unibond after cure
Posted : 2009-06-24 8:16 AM
Post #35560
Does Unibond 800 offgas after cure? I have a job that specs no urea formaldehyde, but after top coating with conversion varnish will there be any detectable formaldehyde if I use Unibond? It seems the greatest hazard is to me as I work with Unibond, but I wear a respirator.


 
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Don Stephan

Posts: 825

Joined: 2003-07-18
Location: Cincinnati, Ohio

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Subject : RE: Off gassing of Unibond after cure
Posted : 2009-06-24 6:09 PM
Post #35564 - In reply to #35560
You might consider clarifying the job specifications, to see if the meaning is no off-gassing of UF after ___ days, or no UF used in the project. If the latter (which would make more sense to me), then off-gassing issue irrelevant.

You have no control over product treatment/use after installation. If finish seals in volatile UF, then the finish is damaged after installation and UF off-gasses, or finish fails after installation and UF off-gasses, . . . lawyers potentially have a field day.

Just my two cents.


 
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Earl

Posts: 75

Joined: 2003-12-04
Location: Pensacola FL

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Subject : RE: Off gassing of Unibond after cure
Posted : 2009-06-24 10:10 PM
Post #35567 - In reply to #35560
Tim,

I think you'll find that conversion varnish will be more of an issue with OffGassing than the Unibond will. Go into a closed room with fresh CV and it will just about take your breath away. I never really noticed any issues with Unibond.

Also, I would not use a Urea Formaldehyde glue if it was excluded in the specs, with out a Written approval.

Earl


 
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craig tufankjian

Posts: 308

Joined: 2004-02-01
Location: syracuse ny 13208

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Subject : RE: Off gassing of Unibond after cure
Posted : 2009-06-25 12:03 PM
Post #35569 - In reply to #35567
I have to agree with Earl on the conversion varnish issue. Nasty nasty stuff. I'd rather huff glue, lacquer fumes , acetone and paint thinner all in one day than get a whiff of conversion varnish.


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: Off gassing of Unibond after cure
Posted : 2009-06-25 1:42 PM
Post #35573 - In reply to #35560
Tim,

The off gassing on a urea glue is pretty minimal after it sits and cures for a couple of days. Its the "free" formaldehyde that leaves during this time. You would have to sand the glue line to get any more off after this.

Also, the amount you use on a piece of furniture is quite minimal to start with any way. Obviously an entire house with all the plywood glued with a formaldehyde glue would be another story.

From my understanding conversion varnish has formaldehyde in it although I could be wrong about this, at least these days. Years ago I used a fabulous conversion varnish that was loaded with the stuff. Sure did work nice though.

Darryl Keil
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