Acid Use and Courtesy at Wet Benches

Mary Tang mtang at
Fri Jun 6 17:19:17 PDT 2008

Hi all --

Just two reminders:

1. Check acid change frequency and to log your acid changes.  According 
to the wbdiff operating procedures:

    * The 4:1 sulfuric/peroxide clean should be changed once every five
    * The 5:1:1 H2O:H2O2:HCl hot pot should be changed every four hours.
    * The 50:1 HF tank should be changed once/day.
    * The 6:1 BOE is changed once per month or on an as-needed basis.

With the pass through fully stocked this afternoon, this should be more 
than sufficient for the weekend.  Please be judicious in your use of acids.

2.  Ask before sharing a wet bench.  The person who has the bench 
enabled is responsible for the bench, and therefore, your use if you 
share.  The person enabled has priority access -- and may ask you to 
enable over him/her.

Thanks for your attention --

Your SNF staff

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

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