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Subject: Polysulfide resin offgassing

Polysulfide resin offgassing

From: Shanna LaRea Daniel <shanna.daniel.ctr<-a>
Date: Tuesday, October 14, 2014
We have some polysulfide rubber (from Smooth-On) mold of an object
with possible residue from a cast using Polypoxy Resin 1010 with
Poly Cure 1220 cast from Polytek which looks like it did not cure
properly.  The mold has yellow residue that looks like its breakdown
into a liquid stick form.  Something is off-gassing and we are
trying to figure out what might be causing it.  We have found that
polysulfide begins to smell like sulfur when it begins to break
down.  The smell we are observing gives of a menthol smell.  We are
wonder if anyone as encounter this or have any suggestion on what
might be going on.  We are keeping it sealed in a plastic container
for the time being.

Shanna Daniel, M.A.
Curation Specialist / Maritime Conservator
Navy History and Heritage Command Underwater Archaeology
Mobile: 979-492-6772

                  Conservation DistList Instance 28:21
                 Distributed: Friday, October 24, 2014
                       Message Id: cdl-28-22-017
Received on Tuesday, 14 October, 2014

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