distinguish polyester vs vinylester

A customer dropped off a fiberglass rod, which is supposed to contain
either polyester or vinylester.

The glass content is very high, probably 95% at least.

Is there a method to determine if it is polyester or vinylester?

Thanks,

Dave

"David A. Webb" <[Only registered users see links. ]> wrote in message
news:[Only registered users see links. ]...
I'm not sure how they cure vinylester but I see the base material is made by
addition of acrylic acid to bisphenol A.
Polyester is cured with styrene which can often be smelled on breaking a
piece of the plastic. Another possible sniff test would be to cook a piece
in caustic to hydrolyze then acidify with sulfuric acid to see if you can
smell acrylic acid.
I doubt if glass loading is 95% (except by weight) since that would make an
awfully dry composite.
Frank

"Frank Logullo" <[Only registered users see links. ]> wrote in message
news:A3OYb.2005$[Only registered users see links. ].. .
by
piece
an
Should have said bisphenol A diglycidyl ether/ acrylic acid adduct:
[Only registered users see links. ]
Frank

David A. Webb <[Only registered users see links. ]> wrote in message news:<[Only registered users see links. ]>. ..

Why?

And most cleaning products recommend testing
first on an inconspicuous area :-)


Mark (Alleged to not know nuttin)