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From: "Ed Anderson" <eanderson@carolina.rr.com>
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
References: <list-2131835@logan.com>
Subject: Re: [FlyRotary] Re: Proseal  was   Re: PP construction methods
Date: Thu, 21 Jun 2007 13:30:15 -0400
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Don't know about temps, but here is an interesting article on both =
Polysulfide and Polyurethane adhesive.

http://www.boatus.com/boattech/casey/35.htm

Ed
  ----- Original Message -----=20
  From: Kelly Troyer=20
  To: Rotary motors in aircraft=20
  Sent: Thursday, June 21, 2007 12:33 PM
  Subject: [FlyRotary] Re: Proseal was Re: PP construction methods


     Marv,Tracy,et al,
         Any numbers on the degrees of heat that Polysulfide or the
  newer Polyurethane can handle without degrading??
  --
  Kelly Troyer=20
  "Dyke Delta"_13B ROTARY Engine=20
  "RWS"_RD1C/EC2/EM2=20
  "Mistral"_Backplate/Oil Manifold=20






    -------------- Original message from marv@lancair.net: =
--------------=20


    Polysulfide is an old standby in the insulating glass industry for =
sealing the edges of insulating glass units (think thermopane).  It =
sticks like grim death to most substrates (as long as they're clean and =
degreased) and it retains a good bit of its flexibility for a very long =
time.  Typical insulated glass units sealed with the stuff would carry a =
20 year warranty against seal failure as long as the sealant was =
properly protected from the elements and especially the sunlight... it =
degrades rapidly with high exposure to UV.  The only thing I know of =
that's stickier are the more recent polyurethane sealants, but the =
industrial versions I'm familiar with are not readily available to the =
general public and are sold only in 50 gal drum quantities accompanied =
by a 5gal pail of catalyst.  Both products can put up with pretty high =
heat levels, so they are well suited to a wide range of appl ications.  =
A big difference between the two, although not germaine to this =
discussion, is that polysulfide does not provide a moisture vapor =
barrier, ie, it's permeable to water vapor, whereas polyurethane isn't.

      <Marv>=20


     "Ed Anderson" <eanderson@carolina.rr.com> wrote:
    """
    That Polysulfide is remarkable stuff. When I started to put together =
the two=20
    parts of an 2 1/4" instrument case, the 3/8" thick flange and the =
2.25" tube,=20
    I scratched my head over how to join the two. Set screws were simply =
too=20
    labor intensive, crazy glue was too brittle - but, I had some "tank =
sealer"=20
    left over (years on the shelf) which I mixed a small amount =
together, smeared=20
    a thin amount on the inside of the flange and pushed the tube in.

    Once it set I could not get the tube out of the flange without =
destroying the=20
    aluminum tube. Really sticks and doesn't turn brittle.

    Ed
    """


 
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Diso-8859-1"><!-- BEGIN WEBMAIL STATIONERY -->
<META content=3D"MSHTML 6.00.2900.3086" name=3DGENERATOR>
<STYLE></STYLE>
</HEAD>
<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial>Don't know about temps, but here is an =
interesting article=20
on both Polysulfide and Polyurethane adhesive.</FONT></DIV>
<DIV><FONT face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial><A=20
href=3D"http://www.boatus.com/boattech/casey/35.htm">http://www.boatus.co=
m/boattech/casey/35.htm</A></FONT></DIV>
<DIV><FONT face=3DArial></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial>Ed</FONT></DIV>
<BLOCKQUOTE dir=3Dltr=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3Dkeltro@att.net href=3D"mailto:keltro@att.net">Kelly =
Troyer</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dflyrotary@lancaironline.net=20
  href=3D"mailto:flyrotary@lancaironline.net">Rotary motors in =
aircraft</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Thursday, June 21, 2007 =
12:33=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> [FlyRotary] Re: =
Proseal was Re:=20
  PP construction methods</DIV>
  <DIV><BR></DIV><!-- WEBMAIL STATIONERY noneset -->
  <DIV></DIV>
  <DIV>&nbsp;&nbsp; Marv,Tracy,et al,</DIV>
  <DIV>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Any numbers on the degrees =
of heat=20
  that Polysulfide or the</DIV>
  <DIV>newer Polyurethane can handle without degrading??</DIV>
  <DIV class=3Dsignature id=3Dsignature>--<BR>Kelly Troyer <BR>"Dyke =
Delta"_13B=20
  ROTARY Engine <BR>"RWS"_RD1C/EC2/EM2 <BR>"Mistral"_Backplate/Oil =
Manifold=20
  <BR><BR><BR><BR></DIV><BR>
  <BLOCKQUOTE=20
  style=3D"PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px =
solid">--------------=20
    Original message from <A=20
    href=3D"mailto:marv@lancair.net">marv@lancair.net</A>: =
-------------- <BR><BR>
    <DIV id=3D_htmlarea_default_style_=20
    style=3D"FONT: 10pt arial,helvetica,sans-serif">Polysulfide is an =
old standby=20
    in the insulating glass industry for sealing the edges of insulating =
glass=20
    units (think thermopane).&nbsp; It sticks like grim death to most =
substrates=20
    (as long as they're clean and degreased) and it retains a good bit =
of its=20
    flexibility for a very long time.&nbsp; Typical insulated glass =
units sealed=20
    with the stuff would carry a 20 year warranty against seal failure =
as long=20
    as the sealant was properly protected from the elements and =
especially the=20
    sunlight... it degrades rapidly with high exposure to UV.&nbsp; The =
only=20
    thing I know of that's stickier are the more recent polyurethane =
sealants,=20
    but the industrial versions I'm familiar with are not readily =
available to=20
    the general public and are sold only in 50 gal drum quantities =
accompanied=20
    by a 5gal pail of catalyst.&nbsp; Both products can put up with =
pretty high=20
    heat levels, so they are well suited to a wide range of appl =
ications.&nbsp;=20
    A big difference between the two, although not germaine to this =
discussion,=20
    is that polysulfide does not provide a moisture vapor barrier, ie, =
it's=20
    permeable to water vapor, whereas polyurethane isn't.<BR><BR>&nbsp;=20
    &lt;Marv&gt; <BR><BR><BR>&nbsp;"Ed Anderson"=20
    &lt;eanderson@carolina.rr.com&gt; wrote:<BR>"""<BR>That Polysulfide =
is=20
    remarkable stuff. When I started to put together the two <BR>parts =
of an 2=20
    1/4" instrument case, the 3/8" thick flange and the 2.25" tube, =
<BR>I=20
    scratched my head over how to join the two. Set screws were simply =
too=20
    <BR>labor intensive, crazy glue was too brittle - but, I had some =
"tank=20
    sealer" <BR>left over (years on the shelf) which I mixed a small =
amount=20
    together, smeared <BR>a thin amount on the inside of the flange and =
pushed=20
    the tube in.<BR><BR>Once it set I could not get the tube out of the =
flange=20
    without destroying the <BR>aluminum tube. Really sticks and doesn't =
turn=20
    brittle.<BR><BR>Ed<BR>"""<BR></DIV>
    <P><PRE>&nbsp;</PRE></BLOCKQUOTE></BLOCKQUOTE><!-- END WEBMAIL =
STATIONERY --></BODY></HTML>

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