chemical resistance and sealants

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Author Message Lynn Javoroski FCSI CCS LEEDŽ AP SCIP Affiliate Senior Member Username: lynn_javoroski Post Number: 1942 Registered: 07-2002 Posted on Wednesday, January 07, 2015 - 11:15 am:    I have the following components in products that will be coming in contact with sealants (and paint). The last time I took Chemistry was in High School; I recognize some of these as fairly ordinary, but am wondering if the sealants need to be "special". (we're using epoxy paints and coatings): Hazardous Component % by Weight 2-phenylphenol 7.7 o-benzyl-p-chlorophenol 7.7 Isopropanol ~10.0 Phosphoric acid ~14.0 Dodecylbenzene sulfonic acid 5.0 Hydrogen Peroxide 1.0 Peracetic acid 0.08 Acetic acid <10 2-phenylphenol 9.09 p-tertiary amylphenol 7.66 Potassium hydroxide 5.00 Sodium hydroxide <02.00 Household Bleach 70% Isopropyl Alcohol J. Peter Jordan Senior Member Username: jpjordan Post Number: 793 Registered: 05-2004 Posted on Thursday, January 08, 2015 - 07:52 am:    It is my understanding that polysulfides are the most resistant to most chemicals including heavy duty cleaning agents. John Bunzick, CCS, CCCA, LEED AP Senior Member Username: bunzick Post Number: 1613 Registered: 03-2002 Posted on Monday, January 12, 2015 - 11:13 am:    There's no way to know without going to a few manufacturers with the list and asking them. Some may have tested for these, others not, so the answer would not likely come from "what type of sealant" so much as "has it been tested" for these things. You also should ask the client what type of contact. On one end is incidental, where it is cleaned up right away, and on the other end is immersion (which is unlikely I suspect). This is an important determinant of chemical resistance. Lynn Javoroski FCSI CCS LEEDŽ AP SCIP Affiliate Senior Member Username: lynn_javoroski Post Number: 1945 Registered: 07-2002 Posted on Thursday, January 15, 2015 - 06:04 pm:    Sigh. I was afraid of that response. We don't want to use polysulfides, and there's no time to submit to manufacturers. I've included the list above in the spec. I wish there were time to do it right, but that's not going to happen. Thanks, guys.