REFLECTOR: EZ poxy & ethanol
John Dibble
aminetech at bluefrog.com
Sat Jun 4 08:09:34 CDT 2011
Tom,
You should weigh the fiberglass before and after to check for weight
gain/loss. The scale you use should read down to 1% of the sample
weight. Also, the issue may not be just the effect on the coating, but
on it's adherence to the fiberglass. To evaluate this I suggest you
leave part of the fiberglass uncoated to see if the mogas gets in
between the coating and the fiberglass.
John
Tom Falls wrote:
> Thanks John, that is reassuring. Reading that some on this list are
> having trouble with the Jeffco after 5-6 years is a concern,
> especially after I just finished (yesterday!!) completely coating the
> right strake with the Rhino 9700. I think I?ll take a piece of cured
> fiberglass and coat it with the Rhino 9700 and then submerse it in 10%
> ethanol mogas and leave it there for weeks/months just to be sure.
> I?ll report back what I find.
>
> Tom
>
> From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]
> On Behalf Of John Dibble
>
> Sent: Friday, June 03, 2011 8:14 PM
> To: Velocity Aircraft Owners and Builders list
> Subject: Re: REFLECTOR: EZ poxy ? ethanol
>
> 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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