Thoughts / Titanium thru hulls and marelon valves - SailNet Community
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post #1 of 6 Old 09-11-2013 Thread Starter
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Thoughts / Titanium thru hulls and marelon valves

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.

http://www.forespar.com/pdf/930136-m...comparison.pdf
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Re: Thoughts / Titanium thru hulls and marelon valves

I've considered Marelon but when thinking about how long it would take to saw through a piece of plastic as opposed to a bronze fitting, it seems less than a good idea.

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post #3 of 6 Old 09-12-2013
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Re: Thoughts / Titanium thru hulls and marelon valves

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Originally Posted by benesailor View Post
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.

http://www.forespar.com/pdf/930136-m...comparison.pdf
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...

DuPont Zytel
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Re: Thoughts / Titanium thru hulls and marelon valves





I take a Groco BV Series over plastic 100% of the time
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Re: Thoughts / Titanium thru hulls and marelon valves

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I take a Groco BV Series over plastic 100% of the time
That's an interesting installation - tell us how it works please. To the untrained eye, it looks like a disc of nylon epoxied to the boat skin with a valve through-bolted to the nylon disc.

I'm sure there is more to it than that.


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Re: Thoughts / Titanium thru hulls and marelon valves

[QUOTE=Omatako;1088008]That's an interesting installation - tell us how it works please. To the untrained eye, it looks like a disc of nylon epoxied to the boat skin with a valve through-bolted to the nylon disc.


I don't think it is nylon it looks like it is G-10

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