RE: Notes-Questions-Article-All

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Rothman, Aric by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Aric.Rothman-at-Honeywell-dot-com>

At www.fiberglast-dot-com you will find a two-part expanding urethane foam
material which might fit the bill.

Aric

> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Tuesday, September 04, 2001 3:51 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: Notes-Questions-Article-All
> 
> 
> Original poster: "jpeakall by way of Terry Fritz 
> <twftesla-at-qwest-dot-net>" <jpeakall-at-mcn-dot-org>
> 
> Daniel,
> 
> It may take months to dry. I made a double walled mash tun 
> (think a big
> thermos) for brewing beer. When I filled the air space, I 
> made LOTS of holes
> and so on, but the foam couldn't dry properly, and left soft 
> spots. Drilling
> into these holes many days later yielded liquid foam that 
> even when left
> outside would no longer expand when it dried. I later tore it 
> apart (months
> later) and found that the liquid had dried, but not expanded, 
> leaving a
> swiss cheese effect. It seems there is an effective depth or 
> volume that one
> can foam at one time. I think if I had layered it over a 
> period of days it
> might have worked.  I used "great stuff" foam.
> 
> YMMV,
> 
> Jonathan Peakall
> ----- Original Message -----
> From: "Tesla list" <tesla-at-pupman-dot-com>
> To: <tesla-at-pupman-dot-com>
> Sent: Monday, September 03, 2001 8:26 PM
> Subject: Re: Notes-Questions-Article-All
> 
> 
> > Original poster: "Daniel Barrett by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <dbarrett-at-clearcube-dot-com>
> >
> >     I tried using the foam last night, but I filled the 
> torroid about 3/4
> > full of styrofoam shipping peanuts to give the foam 
> something to expand
> > into. The outside seems nice and firm today, but I don't 
> plan to take the
> > duct tape off thats holding together for a week or so:) The 
> little blob of
> > foam I stuck on the table outside is still not set after 24 
> hours, so I
> > guessing it will take a while for this stuff to cure.
> >
> >
> > > Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> > <Hollmike-at-aol-dot-com>
> > >
> > > Well, It would seem that it could be done, but perhaps a bit more
> thought
> > > would be in order before trying such a thing.  I joined 
> the ends of my
> > toroid
> > > by affixing tabs(cut from roofing flashing) to the inside 
> of one end
> with
> > > epoxy and then to the other, once the first step dried 
> well.  I think it
> > made
> > > a very strong joint.  I also applied a bead of epoxy to 
> the seam itself.
> > I
> > > would almost guess that the toroid would split at one of the
> corrugations
> > > before parting the ends.   Perhaps one could estimate the 
> proper amount
> of
> > > foam by the time that the valve is opened or something.  
> Perhaps even
> the
> > > location of the injection hole might be a factor.  I 
> would think that
> the
> > > hole should be close to the seam so that part of the foam 
> would set
> while
> > the
> > > rest was still expanding.  I dunno.  I am still just musing.
> > > Mike
> >
> >
> >
> >
> >
> 
> 
> 
>