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Old 23-03-2016, 11:50   #16
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Re: TBT Antifouiling and dessalinator\watermaker

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Originally Posted by vtomanov View Post
BTW: for humans 93mg TBT per cubic meter is enough to get damaged your internal organs... less then that should be OK
An interesting concept. Does that mean we should accept the parameters of minimal levels of harmfulness because they do the least amount of damage. I would rather be minimally exposed period!
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Old 23-03-2016, 12:00   #17
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Re: TBT Antifouiling and dessalinator\watermaker

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A gallon of Sea Hawk's Biotin TBT anti fouling paint weighs about 11 pounds. Of that, 65% is zinc and TBT. You do the math.
I believe their are many pounds of inactive ingredients in bottom paint - solvents, binders, "paint", etc. Could be wrong but I suspect that the TBT is not the bulk of the 35%. Not saying the amount might not be harmful but you need more info to do the math.
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Old 23-03-2016, 12:28   #18
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Re: TBT Antifouiling and dessalinator\watermaker

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Originally Posted by exMaggieDrum View Post
I believe their are many pounds of inactive ingredients in bottom paint - solvents, binders, "paint", etc. Could be wrong but I suspect that the TBT is not the bulk of the 35%. Not saying the amount might not be harmful but you need more info to do the math.
The product is 65.5% solids. Solvents and binders etc. are not solids.
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Old 23-03-2016, 12:57   #19
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Re: TBT Antifouiling and dessalinator\watermaker

Well assuming:

300 boats in a harbor
each boat with 2.5 gal of bottom paint
ALL of the paint being in the water at once and none being still on the boats
the harbor being 1/4 mile X 1/4 mile x 10 foot deep
65% of the paint being solids
1.5 density correction for the paint to the water

The amount of paint in the harbor water is 0.000731 ppm. That is max concentration possible.

Assume that a watermaker removes 90% of the solids -> 0.0000731 ppm paint in the fresh water tanks

What does this prove? Nothing except being worried about how much of it ends up in the potable water tanks after using an watermaker is a pretty small amount.
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Old 23-03-2016, 13:14   #20
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Re: TBT Antifouiling and dessalinator\watermaker

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The product is 65.5% solids. Solvents and binders etc. are not solids.

Yes, but I work with pesticides, and if this stuff is like pesticides, then vanishingly small amounts is all it take to be very toxic, literally some of that stuff one drop on your skin will have disastrous results.
It's possible that this TBT stuff could be very toxic, and a tiny bit is all it takes?
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Old 23-03-2016, 13:21   #21
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Re: TBT Antifouiling and dessalinator\watermaker

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Yes, but I work with pesticides, and if this stuff is like pesticides, then vanishingly small amounts is all it take to be very toxic, literally some of that stuff one drop on your skin will have disastrous results.
Any metal-laden anti fouling paint isn't like a pesticide, it is a pesticide. In California, anti fouling paint falls under the auspices of the Department of Pesticide Regulation. I'm sure there is a similar agency in all 50 states.
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Old 23-03-2016, 13:26   #22
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Re: TBT Antifouiling and dessalinator\watermaker

So if I read this thread correctly, watermaker water would be fine in the Carribean but cause cancer in California.
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Old 23-03-2016, 13:38   #23
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Re: TBT Antifouiling and dessalinator\watermaker

in cornwall ware for the last 400 years we had the biggest and oldest tin mines in the world,with alluvial tin runoff from the many mines which still flows into the bays and rivers,also supplies most of Europe with shellfish,lobsters and oysters,of the highest quality........I think the "heavy"part of heavy metal explains why it is not a risk,unless you stir up the bottom.......
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Old 23-03-2016, 13:46   #24
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Re: TBT Antifouiling and dessalinator\watermaker

RO units remove salt at the molecular level. Tin fluoride molecules are larger than NaCl molecules. I suspect that the TBTF is removed pretty effectively.

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Old 23-03-2016, 13:46   #25
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Re: TBT Antifouiling and dessalinator\watermaker

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So if I read this thread correctly, watermaker water would be fine in the Carribean but cause cancer in California.
t
Hostly - I actually think you are correct TBT is not tbe main issue with the water ... military, chemical factories, power stations, big cities etc. the water in caribean will be always cleaner the California
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Old 23-03-2016, 17:39   #26
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Re: TBT Antifouiling and dessalinator\watermaker

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Originally Posted by fstbttms View Post
The product is 65.5% solids. Solvents and binders etc. are not solids.
Got me there! Still bet there are other solids in there besides the tin and zinc. Just a hunch.
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Old 23-03-2016, 17:58   #27
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Re: TBT Antifouiling and dessalinator\watermaker

Just found this: Sea Hawk Paints maker indicted over TBT use | Trade Only Today

Andthis: Sea Hawk Paints executives get prison terms in banned-coating case | Trade Only Today

I cannot find an MSDS for any of ther products, which is required for any kind of industrial or consumer product. I found one site that said in a product sheet to review the MSDS for one of their paints and now I can't find it again.
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Old 23-03-2016, 18:06   #28
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Re: TBT Antifouiling and dessalinator\watermaker

I don't think the MSDS is going to give you the percentage of TBT.

OK so it is a pesticide, most of the pesticide stuff is highly diluted when it gets to the end user, but in its non diluted form only a few ounces are required in 500 gls of water and applied at ounces per acre to kill insects, like locusts. So a few ounces spread out over several square miles will kill locusts.
It may be that TBT is so highly toxic that it takes very little of it in a gallon of paint to make the whole gallon highly toxic.
I'm not saying the stuff isn't toxic, just saying it may be far more toxic than you think, or could be is all.


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Old 23-03-2016, 18:07   #29
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Re: TBT Antifouiling and dessalinator\watermaker

You can find the spec sheet for one of the SeaHawk TBT products here:

http://www.seahawkpaints.com/wp-cont...ata_3-3-16.pdf

And the SDS (formerly MSDS) here:

http://www.seahawkpaints.com/wp-cont...-Plus-2016.pdf

~10% tin compounds
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Old 23-03-2016, 18:10   #30
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Re: TBT Antifouiling and dessalinator\watermaker

Found something interesting. Apparently in the state of Georgia TBT paints can still be used if you have an aluminum hull.
http://marex.uga.edu/uploads/documen...ia_Boaters.pdf


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