Build your own custom weighing table! I attach a 3D model (google sketchup) for the weighing tables we use in our clean lab. I took that to a local stone mason (or wherever you buy your grave stones), where you can chose between granite, gabbro, marble, etc. Usually they treat every solid rock as 'granite' so ask for samples. I preferred the gabbro, which is poor in traces and very acid resistant, but that turned out to be too expensive. Only very rich people can (could) afford gabbro graves. They then had the granite slabs cut and polished and China, then shipped over to Australia, glued everything together with special stone glue, and even carried the 300kg monsters into the clean lab. Price was about $1500 each or so, and they are awesome, and they will still be there when I have my own gabbro.
University of Western Australia
School of Earth and Environment M004
Advanced Geochemistry and Mass Spectrometry Facility
Crawley, Western Australia 6009
From: PLASMACHEM-L: Analytical Chem.(ICP's, DCP's, MIP's). [mailto:[log in to unmask]] On Behalf Of Michael M Cheatham
Sent: Friday, 8 June 2018 01:56
To: [log in to unmask]
Subject: Re: balance table suppliers
An alternative to the standard thick slab marble table is a thick slab epoxy resin table. I put three of these in our new class 1000 and class 10000 cleans labs not too many years ago. The labs were designed and built to be as metals free as possible. One class 1K lab was dedicated to low level radiogenic isotope work - so marble was out of the question. The other class 1K lab was dedicated to ultra low level Iodine geochemistry and Oceanic redox sensitive elements - again ruled out marble. The class 10K lab was dedicated to stable isotope work - a rather tricky set of design criteria had to be considered for inorganic and organic sources of contamination - resin won out over marble. The epoxy based balance tables proved to not being the limiting factor for the balance work. In the case of the Iodine lab, the balance was a microgram balance and we found that air currents were a much greater problem. One consideration in the class 10K lab was to use ionizing curtains. We never went through with it, but I believe these devices were discussed on this list. All three labs have electrostatically dissipative floors.
Michael M. Cheatham
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314 Hall of Languages, Syracuse, NY 13244 theCollege.syr.edu