[labnetwork] BOE clean up

[Demis D. John]

I believe these form due to getting cold, so a little heat applied in any way may unclog it. 
We see BHF liquid left on the benches for too long sometimes fill with crystals, and I’ve heard warming them (even with running DI on the outside of the container) dissolves them again. 

-- Demis


> On Feb 26, 2019, at 11:52, Aebersold,Julia W. <julia.aebersold at louisville.edu> wrote:
> 
> Same here. We just use DI and that usually takes care of it.
>  
> Cheers!
>  
> Julia Aebersold
> Manager, Micro/Nano Technology Center
> University of Louisville
> Shumaker Research Building, Room 233
> 2210 South Brook Street
> Louisville, KY  40292
> (502) 852-1572
>  
> http://louisville.edu/micronano/
>  
> From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Morrison, Richard H., Jr
> Sent: Tuesday, February 26, 2019 5:44 AM
> To: Josh Heinemann <josvanhei at gmail.com>; labnetwork at mtl.mit.edu
> Subject: Re: [labnetwork] BOE clean up
>  
> Those most likely are ammonium fluoride crystals, in the past I have used just plain old DI maybe heat it up a little that should dissolve the material.
>  
> Rick
>  
>  
> From: labnetwork-bounces at mtl.mit.edu [mailto:labnetwork-bounces at mtl.mit.edu] On Behalf Of Josh Heinemann
> Sent: Monday, February 25, 2019 12:28 PM
> To: labnetwork at mtl.mit.edu
> Subject: [labnetwork] BOE clean up
>  
> Hi, 
>  
> I appreciate any feedback you can give me.  We have a clogged valve from our BOE etch tank.  Does anyone know what is the best chemical to dissolve salt crystals which may have formed in the valve?
>  
> Best regards,
>  
> --
> Joshua Heinemann
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