Brian

Thank you we will try this first thing in the morning.
We will also run an old stamp through our electron microscope with an EDAX
and check its purity.
If we buy some gold rod to make our own stamps from Johnson Matthey or
Goodfellows then we need to know which grade. Pure gold will probably be
too soft although OK for the gasket.

Regards

John

At 16:17 24/11/2004, you wrote:
>The past few times I changed our valve seals we had a local machine shop to
>resurface the gold stamps and they work great even after three times of
>resurfacing. The gold rings I have been making out of pure gold wire bought
>from Scientific Instrument Services (http://www.sisweb.com/), however, this
>does require soldering the wire ends together. If you do not feel up to this
>I am sure a local jeweler could do this for you at a minimal cost. This was
>the cheapest solutions I could find.
>
>Brian Jones
>
>Research Assistant
>
>Dept. of Oceanography
>
>Texas A&M University
>
>College Station Tx. 77843
>
>(979) 845-8916
>
>-----Original Message-----
>From: Stable Isotope Geochemistry [mailto:[log in to unmask]] On Behalf
>Of J T Hill
>Sent: Wednesday, November 24, 2004 5:57 AM
>To: [log in to unmask]
>Subject: [ISOGEOCHEM] Gold Gaskets
>
>Hello
>
>Does anyone have a source for cheaper spares for the vacuum valves on the
>Kiel with MAT253 device than Thermo charge?  We have had to replace stamps
>on several of our valves, and need gold stamps and gaskets.
>
>Alternatively we do have facilities for making these parts, but we're not
>sure of the original gauge of the wire used in the seals.  Also, what gold
>purity (99.999%)? is required for the stamps and seals.
>
>Hoping someone has already been through this and can suggest suppliers.
>
>Yours,
>
>John Hill
>
>
>John Hill
>Mass Spectrometry Facility
>University College London
>Chemistry Department
>20 Gordon St.
>London
>WC1H 0AJ
>
>Tel:  020 7679 4605
>Fax: 020 7679 7451
>Mobile: 07956 924058

John Hill
Mass Spectrometry Facility
University College London
Chemistry Department
20 Gordon St.
London
WC1H 0AJ

Tel:  020 7679 4605
Fax: 020 7679 7451
Mobile: 07956 924058