David
No, you were right. Organic means carbon based structures, and resins are
organic even with metal ligands.
Inorganic pigments tend to be metal oxides that rest as separate paticles in
suspension.
Carey
-----Original Message-----
From: Albin, David <[log in to unmask]>
To: [log in to unmask] <[log in to unmask]>
Date: Thursday, February 17, 2000 12:39 AM
Subject: Re: [TN] Why are soldermasks green?
>Oops!
> sorry- I suppose the correct term would be organometallic, as the
>dye structure is a copper complex (inorganic/metal) with phthalocyanine
>groups (organic) surrounding it.
>To answer your further question, I am not I pigment expert but there are
>some inorganic chrome-based pigments that are pretty stable. I don't know
if
>anyone uses these type of pigments in soldermasks, though.
>
>-----Original Message-----
>From: Ken Fong [mailto:[log in to unmask]]
>Sent: 17 February 2000 04:18
>To: [log in to unmask]
>Subject: Re: [TN] Why are soldermasks green?
>
>
> David,
> In your 2nd explanation, you mentioned the word "organic", could it be
> inorganic? If yes, are there any inorganic heat stable colour?
>
> Regards,
> KenF, Feb 17,00
>
>
>______________________________ Reply Separator
>_________________________________
>Subject: Re: [TN] Why are soldermasks green?
>Author: "TechNet E-Mail Forum." <[log in to unmask]> "Albin David"
><[log in to unmask]> at Internet
>Date: 2/16/00 1:54 PM
>
>
>I can offer two other alternative explanations:
>(1) When PCB's were hand assembled, a great many of the operators found
>the green colour 'more restful' on the eyes than other colours used.
>
>(2) A more likely explanation is that the green colour is usually from
a
>copper phthalocyanine pigment, which at the time of the first boards, was
>the only heat-stable organic colour.
>
>David Albin
>Project Leader
>Coates Circuit Products
>
>-----Original Message-----
>From: Arturo Aguayo [mailto:[log in to unmask]]
>Sent: 16 February 2000 08:14
>To: [log in to unmask]
>Subject: [TN] Why are soldermasks green?
>
>
>I was recently asked by a college student working on a research project,
>"why are printed circuit boards green?". The short answer to that is that
>they are green because of the soldermask color. Which led to the next
>question "is there a reason why soldermasks are green?" To this question I
>had no answer and therefore turn to this forum to see if anybody might know
>the reason (I wouldn't want a student to not graduate because of me).
>
>regards
>Art Aguayo
>
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