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Old 07-20-2005, 04:02   #1 (permalink)
rads
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Fibre Glass Resin and Petrol

99% certain this is a stupid question, given the existance of GRP fuel
tanks, but the nagging 1% of doubt forces me to ask:

Is fibreglass resin fuel(petrol) proof?

TIA

David
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Old 07-20-2005, 04:02   #2 (permalink)
Badger
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Re: Fibre Glass Resin and Petrol


"rads" <radsxxunspamxx@davidradley.freeserve.co.uk> wrote in message
news:hf2sd15iu0118g89gh12h157nnbsi3rlcp@4ax.com...
> 99% certain this is a stupid question, given the existance of GRP fuel
> tanks, but the nagging 1% of doubt forces me to ask:
>
> Is fibreglass resin fuel(petrol) proof?
>
> TIA
>
> David


It depends on the resin. There are differing compositions of both polyester
and epoxy resin systems on the market, some are ok with petrol (I'm assuming
that's the fuel in question) and some aren't. I've used Crystic 17789
polyester resin in contact with fuel and it was ok, but you MUST let the
resin fully cure for around 4 or 5 days before fuel contact. if the fuel
contacts it prior to full chemical cure, it will just soften and make a
god-awful mess.
Crytstic 17789 is a 3-part resin, consisting of resin, catalyst and
accelerator. It cures by an exothermic chemical reaction and the mix
quantities are critical for strength. Too much catalyst or accelerator and
it can self-combust!! A safer and very similar alternative, visit your local
boat chandlery and get a gallon tin of pre-accelerated polyester resin,
comes with a small tub of catalyst and costs around 30. As long as you
leave it to cure fully, it ought to be ok. I made a bonnet for a hillrally
motor using it and it's been regularly splashed with fuel whilst filling up
with no problems.
Epoxy resins are also available that are impervious to petrol, but they tend
to be thicker in composition and are really intended for semi-automated
manufacturing processes, i.e. autoclaves and vaccum-bagging.
Good luck.
Badger.


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Old 07-20-2005, 08:01   #3 (permalink)
steve Taylor
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Re: Fibre Glass Resin and Petrol

Badger wrote:

> Epoxy resins are also available that are impervious to petrol, but they tend
> to be thicker in composition and are really intended for semi-automated
> manufacturing processes, i.e. autoclaves and vaccum-bagging.


I thought West system 'poxs were OK for layup type glassing ?

Steve
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Old 07-20-2005, 15:02   #4 (permalink)
Badger
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Re: Fibre Glass Resin and Petrol


"steve Taylor" <steve@thetaylorfamily.org.uk> wrote in message
news:42de56e5$0$31172$db0fefd9@news.zen.co.uk...
> Badger wrote:
>
>> Epoxy resins are also available that are impervious to petrol, but they
>> tend
>> to be thicker in composition and are really intended for semi-automated
>> manufacturing processes, i.e. autoclaves and vaccum-bagging.

>
> I thought West system 'poxs were OK for layup type glassing ?
>
> Steve


I did say "tend", not are. Yes, there are thinner composition epoxies
around, but never having actually used them, I couldn't name any. The epoxy
I used on aerospace carbon fibre was like flamin' treacle! You had to roller
it into the cloth by spreading it onto 2 pieces of acetate sheeting, with
the cloth sandwiched inbetween. A very messy process, prone to air
inclusions and irregular bond strength, even utilising vacuum bagging.
Badger.


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