[labnetwork] wet bench issue

[Morrison, Richard H., Jr.]

Hi Everyone,

 

When you mix bases and acids in wet benches with lip exhaust we
sometimes grow crystals, mostly with NH4OH and HCL baths, for instance a
bath with says 10% NH4OH next to a bath with 5% HCL. Besides dumping the
tanks every day, how can you keep the crystal growth down? 

We solved that issues with BOE by covering the bath, but NH4OH and HCL
evolve lots of gas so lids are problematic.

 

Rick

 

 

Rick Morrison

Senior Member Technical  Staff 

Acting Group Leader Mems Fabrication

Draper Laboratory

555 Technology Square

Cambridge, MA  02139

 

617-258-3420

 

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