RE: [APML] Out-gassing(sp?)

["R. Scott Ireland" <ireland@gate.net>]

Hi Jeff,

I have the same equipment as you.  In addition, I use the Marvac electric
vacuum pump (low vacuum; basically a fancy, tireless hand pump that doesn't
make you're hand hurt <g>).

For 35mm color film (PJ400 in particular) I preheat the chamber to 50C; then
insert the film (in cassette); then use the Marvac for a 35 minute pump
down; then insert forming gas to +3 psi; then hyper for 7 hours.

If I'm doing several rolls at once (last job I did was 5 cassettes at once)
I may take extra precautions.  In this case I added 2 or 3 "add gas/pump
down" purging cycles and filled to +5 psi.

If you're using a hand pump, you really need to use some "add gas/pump down"
purging cycles to compensate for the limited vacuum pull.

"Outgassing", to me anyway, connotes a high vacuum setup, which is a whole
different ballgame.

Take care,

Scott

website:  http://www.rsiphotos.com/
email:  ireland@gate.net

> -----Original Message-----
> From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> Behalf Of Jeff Ball
> Sent: Wednesday, September 26, 2001 10:25 PM
> To: Astro-Photo
> Subject: [APML] Out-gassing(sp?)
>
>
> Hello All,
> I am curious as to the best method for outgassing film prior to
> hypering.  I
> have the 600 Lumicon chamber and 50Deg probe.  Thanks for any
> help on this.
>
> Jeff Ball
> Astrophotography
> www.astro-photography.com
> Ohio Valley Astronomical Society
> www.ovas.org
>
>
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