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October 1999

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Subject:
From:
Rudy Sedlak <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 11 Oct 1999 21:04:52 EDT
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In a message dated 10/11/99 5:43:48 PM Pacific Daylight Time,
[log in to unmask] writes:

<< So it's ammoia , interesting .
 What's ammoia's function in temp solder mask ;
 if there is nonammoniated version ?
  >>

Ammonia, in coatings, is usually present to neutralize the acidity of the
coating, thus rendering it more water soluble.   And being volatile, it is
neutralizer that you can cause to go away with heat, thus baking the coating
to a greater level of water resistance.

I suspect strongly that a non-ammoniated version is theoretically possible,
whether it is commercially available, I cannot answer.

Rudy Sedlak

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