[labnetwork] [EXTERNAL] Re: Cleanroom humidity

[April, Mark R.]

Hi All
We here at Draper Laboratory keep out clean rooms at 68 +/- 3 F, humidity 45 +/- 2, with steppers and photo aligners
Thanks


Mark April | Microfabrication Senior Equipment Engineer| Draper
555 Technology Square| Cambridge, MA 02139-3563
Office: 617-258-1613
Cell: 617-455-1596
mapril at draper.com<mailto:mapril at draper.com>
www.draper.com<http://www.draper.com/>



From: labnetwork <labnetwork-bounces at mtl.mit.edu> On Behalf Of Paolini, Steven
Sent: Wednesday, December 17, 2025 7:22 PM
To: Alex Dixon <agdixon at mines.edu>; Lab Network <labnetwork at mtl.mit.edu>
Subject: [EXTERNAL] Re: [labnetwork] Cleanroom humidity


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We have multiple photo tools, including EBL and a stepper that are sensitive to changes in RH. What's most important, aside from the actual value, is consistency. if your RH is not consistent, it will affect the photo speed. Here at Harvard CNS, we maintain 52% +_ 2 which is relatively easy to maintain and comfortable for our occupants.
Steve Paolini (Equipment Dood)

________________________________
From: labnetwork <labnetwork-bounces at mtl.mit.edu<mailto:labnetwork-bounces at mtl.mit.edu>> on behalf of Alex Dixon <agdixon at mines.edu<mailto:agdixon at mines.edu>>
Sent: Wednesday, December 17, 2025 1:12 PM
To: Lab Network <labnetwork at mtl.mit.edu<mailto:labnetwork at mtl.mit.edu>>
Subject: [labnetwork] Cleanroom humidity

For those of you with climate controls in your cleanrooms, what relative humidity do your keep your cleanroom at, and how tightly do you control the fluccuations?  How significant an effect have you seen on device performance?

Our campus facilities is doing a climate control audit and asking any lab with special requirements to justify them. Any info you could share would be appreceated.

Thanks!
-Alex

__________________________________________________________


Alex Dixon, Ph.D. (He/Him)
Lab Manager
Nanofabrication and Thin Film Deposition
Shared Instrument Facility
Colorado School of Mines

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