Please conserve 50:1 HF Use

Mary Tang mtang at
Fri May 15 17:59:51 PDT 2009

Dear labmembers:

Please conserve your use of 50:1 HF in the lab.  Certainly, change acid 
when the schedule requires it.  But please be aware that there is a 
very, very limited supply available to us right now.  No need to panic, 
as there are other equivalent options, but these will not be the from 
the same supplier.

For those of you interested in the gory details, part of the problem 
appears to be with the manufacturer, Baker/Mallinkrodt, whose HF process 
line is down.  (This affects only their HF/water mixes; their BOE line 
is not affected.)  The other problem appears to be with the economy, as 
distributors try to minimize their inventories. 

Updates on the situation will be posted on the wet bench lists and Coral.

Thanks for your attention --

Your SNF Staf

Mary X. Tang, Ph.D.
Stanford Nanofabrication Facility
CIS Room 136, Mail Code 4070
Stanford, CA  94305
mtang at

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