Re: more glue questions


Dennis Storzek
 

On Sat, Oct 9, 2021 at 05:21 PM, Charles Peck wrote:
So much difference is there between old yellow Barge and Weldwood contact cement? 
Don't they work in a similar way? 
ALL these solvent based contact cements we've been discussing work the same way. They are a synthetic rubber (Weldwood says neoprene, Pliobond says nitrile, can't find what's in Barge) dissolved in a mix of solvents blended to give the drying time desired. Here is the list of solvents for Weldwood:
Toluene, Methyl ethyl ketone (MEK), Light aliphatic solvent naphtha, n-Heptane
Can't find a MSDS sheet for Goo, although a good guess would be old boots dissolved in naphtha. Whatever the solvent in Goo is, it must be exceedingly slow to evaporate, or the formula includes some plasticizer to keep the glue line pliable, and that 
plasticizer migrates into polystyrene and makes IT pliable.

Dennis Storzek

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