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Re: gEDA-user: Isopropyl alcohol vs. ethanol

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Subject: Re: gEDA-user: Isopropyl alcohol vs. ethanol
From: John Doty <jpd@xxxxxxxxxxxxx>
Date: Mon, 24 Apr 2006 08:26:28 -0600
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On Apr 23, 2006, at 10:43 PM, Dave McGuire wrote:

Do you have any opinion on washing boards with something like Alconox (a trisodium phosphate-based cleaner)?

I wouldn't want a cleaner containing sodium. Sodium ions have high mobility in epoxy, especially in the presence of moisture. Sodium is soluble in SiO2, so it can shift transistor gate thresholds. It is common to passivate chips with a glass designed to getter sodium, but that's not a perfect barrier.

John Doty              Noqsi Aerospace, Ltd.
jpd@xxxxxxxxxxxxx

Follow-Ups:
- Re: gEDA-user: Isopropyl alcohol vs. ethanol
  - From: Marvin Dickens

References:
- gEDA-user: Isopropyl alcohol vs. ethanol
  - From: Karel Kulhavy
- Re: gEDA-user: Isopropyl alcohol vs. ethanol
  - From: Marvin Dickens
- Re: gEDA-user: Isopropyl alcohol vs. ethanol
  - From: Dave McGuire

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