[Public-List] Water Tank

[Dwayne Back]

Unfortunately when it come to epoxy, gel-coat, or plastics in general there is always an opportunity for contamination.  Even with a background in chemistry I cannot say with any confidence whether the contaminates are harmful or not but if its plastic, epoxy, gelcoat, paint or any other polymer based substance there is always opportunity for contamination because the polymerization is never a 100% process so there are always left over small molecules that can migrate out of the plastic.  This even includes a polyethylene "water bag" that I use for camping and unfortunately is usually left in the sun which only accelerates the process or even PVC which is used in modern plumbing.  Point being EPA deemed safe is not to mean there is not chemicals present, just that someone spent the money to have the EPA say the chemicals present are not harmful.  Of course there are many things that the EPA have said were safe that are now illegal and if you
 compare us to Europe we are in a pool of toxins because there are many things illegal in Europe that are sold in America, women's makeup in particular. Given that we drink water out of plastic bottles, I guess my take is just use best judgment, because if you are looking for absolute safety from chemical contamination you are not going to find it economically.

Dwayne
Orion 94


________________________________
 From: Glennb <brooks.glenn at comcast.net>
To: Alberg 30 Public List -- open to all <public-list at lists.alberg30.org> 
Sent: Saturday, July 27, 2013 3:36 PM
Subject: Re: [Public-List] Water Tank
 

Not really, from what I learned recently, most epoxy and FG leach organics into drinking water.  Only a few epoxy and FG products  are EPA certified for use in potable water tanks. For example Sherwin Williams only had two certified epoxy coatings and the smallest 2 part mix was 2 gallons @$200.  

Here is an interesting article about organic solids from epoxies leaching into drinking water. 

http://www.pprc.org/research/epp/Epoxy-Lined_Pipes.pdf

Iam not  sure charcoal filters are any good at removing these organics as the size of the molecule may be so small they could pass right through.  Does anybody know?  Would be interesting to hear if they actually are effective with this stuff. 

Glenn
Dolce 318

Sent from my iPad

On Jul 27, 2013, at 11:40 AM, George Dinwiddie <gdinwiddie at alberg30.org> wrote:

> Their reply sounds a little fishy and self-serving. For one thing, gel-coat is made with polyester resin, not epoxy. Polyester resin does leach into the water, but that's also what our original tanks are made of. 
> 
> George
> 
> Sent from a primitive pocket computer. Please assume all errors are due to that.
> 
> On Jul 27, 2013, at 12:52, "randall weatherspoon " <rlwspoon at earthlink.net> wrote:
> 
>> I finally was able to contact the supplier I had spoke of with the
>> following:
>> 
>> 
>> 
>> Epoxy ( fiberglass or gel coat ) does leach various chemicals into the
>> water.
>> 
>> 
>> 
>> If you have little black specs in the tank - they need to be removed (sanded
>> out) prior to coating as they are probably cobalt which is extremely toxic,
>> whether this is a derivative from the epoxy or  precipitates from the water
>> - don't know.
>> 
>> 
>> 
>> The product they sell is called "NSF" and is certified for potable water
>> tanks and food handling applications.
>> 
>> 
>> 
>> Oceaneering Research & Development
>> 
>> 800-659-8270  St Petersburg FL
>> 
>> Email Will at  Newlander4 at netzero.com
>> 
>> 5 gal ==4resin + 1hardner   > 250sqft - $375.00
>> 
>> They sell smaller quantities.
>> 
>> Recommends 2 coats.
>> 
>> 
>> 
>> Hope this is helpful for all.
>> 
>> Randy  
>> 
>> Marisel #385
>> 
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