nylon in petrol

[Mark Pitts]

I'll ask my mother later about chemical resistance of various nylons, but
as for the hygroscopic part of its nature, the most noticable effects are
that if damp it moulds funny (steam in the plasticiser), and when 'dry'
becomes significantly more brittle.

Tip: ever had a bag of cable ties that snap as you do them up, or the
'sprog' breaks out of the ratchet end? Throw the whole lot in a pan f
water, and boil them, then let them cool... perfect!

Mark (making a return after a long period of absense)

Any body remeber me from a year or so ago? Well I moved from Amsterdam
back to the UK, Bought a book by Ron Campion (rubish) 'Build your own
sportscar for 250 pounds' All the dimensions for the chassis tubes are
wrong, and
if you made the steering column like he drew it, you would very nearly be
touching your toes to drive it, never the less 7000 pounds and six months
later, its run in (Ford 1600 formula ford engine) and 270 BHP (wheels) per
tonne, now for the EFI! (Its got second hand Delortos on at the mo.. you
can only
spend SO much! ;) )



On Tue, 4 Nov 1997, Joe Chiasson wrote:

> > Hi all,
> > 
> > i was wondering how nylon (or possibly teflon) fares when in constant
> > contact with petrol. I am planning on cutting a helical groove in a
> > short length to try out a fuel flow metering gizmo, and i need to know
> > if it will withstand being in fuel all day long.
> > 
> 
> Had nylon in contact with gasoline on occasions with no noticeable
> problems.  Daily run liquid propane through 15% glass filled nylon-6,6 
> with no problem.  Have had submerged in liquid propane for months with no
> problem.  Ran into problem with 0% glass filled nylon-6,6 softening up
> after time.  Nylon is hygroscopic (somewhere between 5-10% I think) could
> cause problems if trying to hold tight tolerances over time.
> 
> j.
>