Darryl Keil Last Activity 2025-09-09 11:09 AM
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Don Stephan

Posts: 825

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

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Subject : Temp and Urea F Curing
Posted : 2012-02-09 6:42 AM
Post #36566
Knowing that a minimum temp of 70 deg F is needed for urea formaldehyde glue to cure, what would happen if after the glue has reached the rubber stage, the furnace were to quit and the temp drop below 70, say in the extreme to 60? Fortunately the furnace stopped during the day and I noticed it when the temp had dropped from 74 to 71. (Don't panic NewEnglanders, normally my daytime temp is 68.)


 
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Darryl Keil

Posts: 1455

Joined: 2003-05-22
Location: Maine

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Subject : RE: Temp and Urea F Curing
Posted : 2012-02-10 9:04 AM
Post #36567 - In reply to #36566
Don,

Once you make it to the firm rubber stage, (not soft rubber) the temperature can drop without glue failure. Not dramatically, of course. The important phase of the chemical reaction takes place from 1 to 3 hours depending on room temperature. Higher the temp, faster the reaction. If you do drop down in temperature at the firm rubber stage the final cure will take much longer though. Personally, I would not make a habit of lowering the temp at this stage but if it happens by accident you'll be OK.

Darryl Keil


 
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ckurak

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Joined: 2006-10-28
Location: Florida

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Subject : RE: Temp and Urea F Curing
Posted : 2012-02-13 3:35 PM
Post #36570 - In reply to #36566
Don,

I see that Darryl answered your technical question. Thanks, Darryl.

To avoid such a problem in the first place, I use an electric heating blanket over the bag. It also speeds up the entire process as well.

I also put a comforter over the heating blanket to help retain the heat. The temperature under the blanket can get in the 90's.

Good luck,

Charles


 
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Don Stephan

Posts: 825

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

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Subject : RE: Temp and Urea F Curing
Posted : 2012-02-14 8:07 PM
Post #36577 - In reply to #36570
thanks Charles. I also often use an electric heating blanket, but if I make a 2nd pressing late in the day and leave it in the bag overnight, and the furnace quits when it's 25F or so outside, not sure the elec blanket will keep the sandwich about 70F overnight.
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