No idea on the 2-part, but I found that ordinary rubber washers don't like
oil and petrol (why oh why are petrol 'cans' supplied without a washer twixt
spout and can?). I got some Viton sheet from ebay and that's been OK.
Nitrile is normally the default for O rings or any washers exposed to
hydrocarbons (i.e. oil, petrol, diesel, white spirit, etc). Viton is
even more chemical-resistant but at a price.
Cheap petrol cans come with simple moulded spouts that usually seal OK
without a washer.
On Tue, 11 Jun 2019 10:47:30 +0100, newshound wrote:
Next door's had the cheap one and it leaked when pouring. Mine has a proper
'top' for the spout and the fuel pisses out of that! I made a Viton washer
and it's OK now.
Leaking petrol is bad enough when doing a car - for a hot mower, where the
engine and tank are rather close together...!
I was hoping to make a gasket from a liquid or gloop and allow to settle
I see there are some liquid gaskets of unknown providence but haven't
found any known materials that are resistant to mineral oils and can
flow into a mould.
There seems to be two types of PU rubber.
In general: Polyester type polyurethane is more resistant to oils,
solvents, and weak acids/bases. And polyether type polyurethane is more
resistant to water exposure.
I would say NT's link is for the latter as it doesn't mention resistance
to oils and fuels.
Most of the automotive ones are silicone, and although compatibility
charts show it as incompatible with mineral oil, it works fine when
present as a thin layer in a joint face, because so little surface area
is exposed. Whether you can get these usually somewhat gelatinous
products to flow into a mould very much depends on the shape of the mould.
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