>Hi Jason,
>
>I also had to source a supply of the PCTFE disks and silicone rubber 
>septa after realizing that the only reasonable option is make them yourself.
>
>I use the same PCTFE sheets that Kim described but I also buy rolls 
>of 1/8" red silicone rubber which I cut into 12" x 12" sheets. I lay 
>the PCTFE onto a sheet of rubber, stack up ~20 sheets and take them 
>to an company here in Calgary that specializes in rubber and septa 
>and stuff and they punch them out together (~300 per sheet). When I 
>get them back the PCTFE disks and rubber septa are often loosely 
>stacked together, making it slightly easier to stuff them into the caps.
>
>It takes a bit of testing to get the exact die-punch needed for your 
>vial (something the company did for me) but the cost per cap is now 
>at least in the reasonable price range ~$CND 0.60.
>
>Cheers,
>Steve
>
>At 11:12 AM 4/13/2007, you wrote:
>>Hi All,
>>         I am rapidly running out of septa for my Multiprep vials 
>> and need to find a new supplier.  Typically I only use the 
>> Multiprep for oxygen isotopic analysis of waters.  I have only 
>> used red rubber septa with kel-f disks that I got from Matt Emmons 
>> of Mountain Mass Spec.  Matt seems to be out of the business as he 
>> does not answer calls or emails.
>>So I need a new source.
>>
>>I need these for Wheaton vials (wheaton number 986284, 1 ml, 
>>13mmX44mm, screw cap size 13-425), not exetainers.
>>
>>I have made my own using a 12mm arch punch and 0.125 inch (3mm) 
>>material but would rather just be able to buy them.  Does anyone 
>>have a source of this type of septa?
>>
>>If I have to go the complete custom route does anyone have 
>>suggestion as to septa material (silicone, butyl, red rubber, 
>>viton) and inert disk (PTFE) or not?  Does the advice change any 
>>for hydrogen isotopes on water?
>>
>>Thanks in advance for any advice.  Jason
>>
>>Jason Curtis, Ph.D.
>>Stable Isotope Mass Spec Lab manager
>>Associate-In Geochemistry
>>Department of Geological Sciences
>>241 Williamson Hall
>>University of Florida
>>Gainesville, FL 32611
>>[log in to unmask], office 352-392-2296
>>lab 352-392-3344, fax 352-392-9294
>
>Stephen Taylor
>Lab Manager, Isotope Science Lab,
>University of Calgary, Physics & Astronomy,
>2500 University Dr. N.W.
>Calgary, Alberta,
>Canada, T2N 1N4
>(p) 403 220 8268
>(f) 403 220 7773
>[log in to unmask]
>www.phas.ucalgary.ca/isl