[RASMB] centerpiece info

[Stephen Harding]

Dear Virgil (& Jack/Walter/Tom/Chad/Erby)

We've been using Kel-F's for our polymer work, particularly with organic solvents at lower speeds, and don't recall having any major leak problems, although the set we have (they weren't new when I inherited them - and that was over 30 years ago) have just about come to the end of their working life.

If it turns out you have no use for them we could certainly provide a good home!

All best wishes

Steve


________________________
Steve Harding DSc (Oxon), RFOO (Norway)
Professor of Applied Biochemistry,
University of Nottingham,
School of Biosciences,
Sutton Bonington LE12 5RD, England
(44) (0) 78110 90635
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National Centre for Macromolecular Hydrodynamics (NCMH):
www.nottingham.ac.uk/ncmh<http://www.nottingham.ac.uk/ncmh>
________________________


-----Original Message-----
From: RASMB [mailto:rasmb-bounces at list.rasmb.org] On Behalf Of Virgil Schirf
Sent: 15 July 2015 20:50
To: John J. Correia
Cc: rasmb at list.rasmb.org
Subject: Re: [RASMB] centerpiece info



Thank you everyone for the info. I'll check them out at lower speeds and see what happens. Nothing ventured nothing gained.



Best regards,



Virgil



> My memory is 40K as well - I ruined a set of Kel-F cells I found when

> I setup my AUC facility by running them at 50K without checking max speeds.

> They are soft and will flow and thus leak.  They should be listed in

> older Beckman literature and part lists which I may have somewhere.

>

>

> John J ³Jack² Correia

> Department of Biochemistry

> University of Mississippi Medical Center

> 2500 N State St

> Jackson, MS 39216

> 601-984-1502 (Chairs Office)

> 601-984-1522 (lab)

> jcorreia at umc.edu<mailto:jcorreia at umc.edu>

>

>

>

>

>

>

> On 7/15/15, 2:07 PM, "RASMB on behalf of Walter Stafford"

> <rasmb-bounces at list.rasmb.org on behalf of

> wstafford3 at walterstafford.com<mailto:wstafford3 at walterstafford.com>>

> wrote:

>

>>Hi -

>>I thought it was 45K. We used them a lot at 60K with sapphire windows

>>for the UV/VIS scanner.

>>Walter

>>

>>On Jul 15, 2015, at 15:04, Laue, Thomas <Tom.Laue at unh.edu<mailto:Tom.Laue at unh.edu>> wrote:

>>

>>> Hi-

>>> Yes, they are Kel-F and rated for a much lower rotor speed because

>>>the Kel-F is soft. They aren't dangerous at high speeds, but they do

>>>get ruined.

>>> Maybe Walter can remember the top speed- my recollection is 40K.

>>> Best wishes,

>>> Tom

>>>

>>> -----Original Message-----

>>> From: RASMB [mailto:rasmb-bounces at list.rasmb.org] On Behalf Of Chad

>>>Brautigam

>>> Sent: Wednesday, July 15, 2015 3:00 PM

>>> To: schirfv at biochem.uthscsa.edu<mailto:schirfv at biochem.uthscsa.edu>; rasmb at list.rasmb.org<mailto:rasmb at list.rasmb.org>

>>> Subject: Re: [RASMB] centerpiece info

>>>

>>> Hi, Virgil,

>>>

>>> You might want to try a dive into the RASMB archives; these are

>>>apparently Kel-F/Al centerpieces and according to Marc Lewis, they

>>>were discontinued because the Kel-F could dislodge from the Al.

>>>Sounds like it's not worth the risk.

>>>

>>> Best,

>>> Chad

>>>

>>> -----Original Message-----

>>> From: RASMB [mailto:rasmb-bounces at list.rasmb.org] On Behalf Of

>>>Virgil Schirf

>>> Sent: Wednesday, July 15, 2015 1:50 PM

>>> To: rasmb at rasmb.org<mailto:rasmb at rasmb.org>

>>> Subject: [RASMB] centerpiece info

>>>

>>> Good afternoon,

>>>

>>> I found some centerpieces that look like epon-charcoal wrapped with

>>>what I presume to be an aluminum edge. The part number is 331430 but

>>>I can't find it listed on the Beckman website. Does anyone have any

>>>information on these centerpieces - max speed, dimensions same as

>>>current epon-charcoal or not, etc? They appear to be in excellent

>>>condition.

>>>

>>> Thank you,

>>>

>>> Virgil

>>>

>>>

>>>

>>> ________________________________________________

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>>> Virgil Schirf

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>>

>>Walter Stafford

>>wstafford3 at walterstafford.com<mailto:wstafford3 at walterstafford.com>

>>

>>When you talk, you are only repeating what you already know.

>>But if you listen, you may learn something new. - Dalai Lama

>>

>>

>>

>>

>>

>>

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________________________________________________



Virgil Schirf

UTHSCSA Center for Macromolecular Interactions Room 421D, Mailcode 7760

7703 Floyd Curl Dr

San Antonio TX 78229-3900

Cell:  (210) 382-3712

Email: schirfv at biochem.uthscsa.edu<mailto:schirfv at biochem.uthscsa.edu>

Web:  http://cmmi.uthscsa.edu

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