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Heat VS glue7/7
If all aliphatics - TB1, 2, 3 will loose strength with heat - and not all that much heat, 150 F, how hot does it get in the back of a truck parked in 105 F over the week end? What are the risks?
Many cabinet doors that are shipped via truck must see this situation. I am thinking no risk as proven by history?
You willed to dive into the specific of each of the three glues. TBIII is by far the worst.
Even so, losing 75% of its strength at 170 degrees does not mean cabinet doors falling apart, unless there are stresses on the joint actively trying to pull it apart.
The panels I have had this happen to just opened cracks. the doors themselves did not fall apart. However, in an expensive door, a cracked gluelike on a panel is cause for owner alarm.
My experiences with TBIII after curing tell me nothing about heating while still in storage as uncured glue.
Where did you get the strength numbers? That's really incredible. We are still using epoxy for exterior products that are made in the shop.
Longer dry times are a low cost for peace of mind.
Titebond supplies the #s on their website, though you have to dig a little. T3 is definitely the worst in terms of high temp strength loss. Epoxy is not immune from that problem, but tolerates higher temps. Thermoset adhesives like uf are more stable, but the wood can be the limiting factor re checking.
I remember a Wooden Boat article in which a proponent of cold molded vessels glued up with epoxy acknowledged the fact that the product was somewhat temperature sensitive and said that the lesson was to not anchor your boat over a volcano. Likewise, don't trust your door shipment to a driver that is going to let it bake in a mobile oven, and know your glue specs.
You have to love the Gougeon Bros and all of their testing.
I really like their testing of epoxy sticking to polyester gelcoat. There had been this longtime belief that gelcoat didn't stick to epoxy as well as polyester resin. The destructive testing proves that gelcoat sticks better and withstands damage better than gelcoat on polyester. People used this belief to claim that epoxy repairs were not as reliable as polyester on polyester boats.
West System Epoxy Heat Damage