Join Date: Jan 2003
Location: Maine Coast
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Re: Thoughts / Titanium thru hulls and marelon valves
Originally Posted by benesailor
Given the almost nonexistent corrosion issues with the combo of titanium and marelon valves; and, that the price is about a wash compared to a bronze combo........
Why wouldn't this be a good idea?
I could definitely see the pro's VS the cons.
People say that won't use marelon for seacocks, yet, forespar swears by them as others.
Titanium speaks for itself.
That data should be taken with a grain of salt.... That data uses DAM or dry as molded numbers not after submersion numbers.
Marelon is made of Dupont Zytel nylon 70G13L. If you look up that data, on the DuPont link below, it will give you the dry and wet numbers, DAM (dry as molded), 50% RH and 100% RH, which are considerable weaker. These changes are likely why so many have snapped handles off Marelon valves or broken thru-hull fittings. IMHO I find it a little disingenuous to use DAM numbers to meet UL or ABYC standards when you know the part will always be at 100% RH testing levels because it is designed to be submerged.. These parts will never be at DAM levels but that is the data they use. Something to ponder anyway..
The differences in data are because nylon is hydroscopic and weakens in water. Bronze and titanium will not do this so their numbers remain consistent wet or dry. There are benefits to Marelon, like no corrosion, but they are certainly not as strong...
-Maine Sail / CS-36T
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Last edited by Maine Sail; 09-12-2013 at 03:14 PM.