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According to the Wiki article the 'film was developed in the mid-1950s,' which
could mean original BN1/2/3(shout out to Patrick)/4 pumps might not have it.
Though 'old school' petrol didn't have ethanol in it, I suspect the
distillation process of the time allowed other nasty stuff in the fuel, and
gasoline itself is a pretty good solvent. Maybe some other barrier material was
used?
Geez ... you know you're a 'Healey Nut' when you have to know what the plastic
film on SU pump diaphragms was made of (I did major in chemistry for a couple
years and still have a passing interest--that's my story anyway).
----- Original Message -----
From: "Oudesluys" <coudesluijs@chello.nl>
To: "Bob Spidell" <bspidell@comcast.net>
Cc: josef-eckert@t-online.de, "Austin Healeys List"
<austinhealeyslist@gmail.com>, "healeys" <healeys@autox.team.net>
Sent: Wednesday, November 23, 2016 6:22:12 AM
Subject: Re: [Healeys] su pumps again
Could well be although I am not sure how long mylar has been commercially
available. The SU pump may predate the days of mylar?
Kees Oudesluijs
Op 23-11-2016 om 15:14 schreef Bob Spidell:
re: "...The plastic foil is on the bottom of the diaphragm opposite the stem
..."
That's where it's been on every old pump I've disassembled; the newer
diaphragms I've bought didn't have it. I've always assumed the 'plastic foil'
was mylar: https://en.wikipedia.org/wiki/BoPET
Bob
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<html><body><div style=3D"font-family: Arial; font-size: 12pt; color: #0000=
00"><div>According to the Wiki article the 'film was developed in the mid-1=
950s,' which could mean original BN1/2/3(shout out to Patrick)/4 pumps migh=
t not have it. Though 'old school' petrol didn't have ethanol in it, =
I suspect the distillation process of the time allowed other nasty stuff in=
the fuel, and gasoline itself is a pretty good solvent. Maybe some o=
ther barrier material was used?<br></div><div><br></div><div>Geez ... you k=
now you're a 'Healey Nut' when you have to know what the plastic film on SU=
pump diaphragms was made of (I did major in chemistry for a couple years a=
nd still have a passing interest--that's my story anyway).<br></div><div><b=
r></div><div><br></div><hr id=3D"zwchr"><div style=3D"color:#000;font-weigh=
t:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial=
,sans-serif;font-size:12pt;"><b>From: </b>"Oudesluys" <coudesluijs@chell=
o.nl><br><b>To: </b>"Bob Spidell" <bspidell@comcast.net><br><b>Cc:=
</b>josef-eckert@t-online.de, "Austin Healeys List" <austinhealeyslist@=
gmail.com>, "healeys" <healeys@autox.team.net><br><b>Sent: </b>Wed=
nesday, November 23, 2016 6:22:12 AM<br><b>Subject: </b>Re: [Healeys] su pu=
mps again<br><div><br></div>
=20
=20
=20
=20
<div class=3D"moz-cite-prefix">Could well be although I am not sure
how long mylar has been commercially available. The SU pump may
predate the days of mylar?<br>
Kees Oudesluijs<br>
<br>
Op 23-11-2016 om 15:14 schreef Bob Spidell:<br>
</div>
<blockquote cite=3D"mid:1038574045.51081217.1479910494540.JavaMail.zimb=
ra@comcast.net">
=20
<div>
<div>re: "...The plastic foil is on the bottom of the diaphragm
opposite the stem ..."<br>
</div>
<div><br>
</div>
<div>That's where it's been on every old pump I've disassembled;
the newer diaphragms I've bought didn't have it. I've alway=
s
assumed the 'plastic foil' was mylar: <a href=3D"https://en.wikip=
edia.org/wiki/BoPET" target=3D"_blank">https://en.wikipedia.org/wiki/BoPET<=
/a><br>
</div>
<div><br>
</div>
<div>Bob<br>
</div><br></div></blockquote></div></div></body></html>
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