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post #16 of Old 10-24-2017
eherlihy
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Re: Large Blister on Oday 31 Rudder

Quote:
Originally Posted by boatpoker View Post
Your first reference is kind of curious in that it says solvents will not harm the "rudder blade". It make no reference to the foam.

Your second reference clearly states that ethylene glycol is a solvent !

Suggest you try another search "polyurethane foam dissolve ethylene glycol"
I had hoped that with your background as a marine surveyor that you could reply by educating us on the "simple chemistry" - rather than directing us to conduct a fruitless google search. For the benefit of others; here is that search, and I'll save other readers the trouble; it provides nothing that supports @boatpoker 's assertion;
Click to View Search Results for polyurethane foam dissolve ethylene glycol - Google Search polyurethane foam dissolve ethylene glycol - Google Search


Boatpoker, you need to read ALL the words that I cited from Foss Foam. Here, I'll help make it more obvious for you: "The urethane core is composed of a strong closed cell urethane. Water, gasoline/diesel, solvents or marine borers will not damage [the urethane core of] your rudder blade, even if the fiberglass coating has been damaged." So, Foss is claiming that solvents will not damage the urethane core. Clear enough?

Regarding my second reference, I concede that EG is a solvent (some of us recall from high school that water is frequently called the "universal solvent"), but again reading ALL THE WORDS, it states that EG is "a starting material in the production of urethane foam."


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USCG Licensed OUPV Captain, ASA 101/103/104/105/106/114/118 Instructor - Also certified in Marine Electrical Systems


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Last edited by eherlihy; 10-24-2017 at 10:03 AM.
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