REFLECTOR: EZ poxy & ethanol
John Dibble
aminetech at bluefrog.com
Fri Jun 3 19:13:53 CDT 2011
Weight gain (or loss) is a measure of the effect of the ethanol. Zero
gain means no effect and that is ideal. Weight gain typically results
in a softening of the material. Weight loss means the ethanol is
removing something, typically plasticizers, making the material more
brittle. The chart also lists gasohol, which represents a range of
ethanol/gasoline blends, 10% being most common. Since no weight gain is
indicated, it appears that 10% ethanol should not be a problem.
John
Tom Falls wrote:
> I am currently in the process of coating my tanks with Rhino 9700
> (formerly Jeffco ). Although I have no intention of using fuels with
> ethanol, I do plan on using 98 octane and 100LL. Attached is the data
> sheet for Rhino 9700. Under chemical resistance, pure Ethyl Alcohol
> (Ethanol) is listed with a 6.9% weight gain after 3 weeks. I don?t
> know if this means a failure or not . . . . but again it?s 100%
> Ethanol. Any chemical types out there that can tell us what ?% weight
> gain? really means?
>
> Tom
>
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
> On Behalf Of Velocity
> Sent: Friday, June 03, 2011 2:02 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: EZ poxy ? ethanol
> I had a very similar experience with pump gas. Melted my optical sump
> sensor
> and pealed the jefco in the sump. I could not tell you if it was the
> Ethanol because they put so much crap in our gas
> here in Chicago. But some thing in the gas station pump gas
> is not good for our tanks.
> The epoxy was not effected by the gas just the jefco pealed. Makes me
> question the Jeffco
> Ron
>
> ----- Original Message -----
> From: Alex Balic
> To: 'Velocity Aircraft Owners and Builders list'
> Sent: Friday, June 03, 2011 11:38 AM
> Subject: Re: REFLECTOR: EZ poxy ? ethanol
> I had a similar problem as Chris- although I did not put any
> mogas in my mains, I had my sump filled with 89 pump gas for
> engine testing, and after about 6 months, I noticed gas
> weeping from the bottom- so I pulled it and the Jeffco had
> become soft and pasty- not sure what happened there, I
> re-built the sump using a new batch of Jeffco, but have been
> running on 100ll since just to make sure there is no
> problem?.. I will try the auto fuel again at some point?
>
> -------------------------------------------------------------
> From: reflector-bounces at tvbf.org
> [mailto:reflector-bounces at tvbf.org] On Behalf Of Laurence
> Coen
>
> Sent: Friday, June 03, 2011 11:16 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: EZ poxy ? ethanol
> Peter,
> You are not the first to warn people about EZ poxy and
> ethanol and I doubt that you will be the last. I refer you
> to Al Gietzens' email where he has 6 years experiences with
> ethanol containing fuel in his EZ poxy tanks without a
> problem. I personally tested a strip sealed in a container
> with denatured alcohol with no apparent effect after 6
> months. Despite all the warnings, I have never seen or herd
> of any documented evidence that would indicate that EZ poxy
> is adversely affected by ethanol containing fuel. If you
> have a reference, please share it with the group.
> Larry Coen
> N136LC
> From: Peter Braswell
> Sent: Friday, June 03, 2011 10:26 AM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: Fuel Tank Questions
> Mark,
> That almost certainly sounds like the EZ poxy that ships
> with the kit and NOT Jeffco (the really good stuff).
> My understanding is that the EZ poxy holds up just fine with
> aviation fuel but I'd be VERY hesitant to use it in
> conjunction with fuel containing ethanol.
> I may have missed, but are you flying an auto conversion?
> Peter
>
> -
> ------------------------------------------------------------
>
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>
> -------------------------------------------------------------
> On Fri, Jun 3, 2011 at 11:07 AM, Markinchampions
> ?markinchampions at gmail.com? wrote:
> It appears as a dark brownish red color.
>
> Sent from my iPod.
>
> On Jun 3, 2011, at 10:21 AM, ?Al Gietzen?
> ?ALVentures at cox.net? wrote:
>
> I don't know what was used. I didn't build it and
> I'm not that familiar with fiberglass.
>
> EZ-poxy is the epoxy system that Velocity sent
> with the kits; and is most likely what was used.
> Shine a light in the tank ? should be a
> yellow/brown/gold color if EZ-poxy, gray if
> Jeffco.
>
> Al
>
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