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Reply To: | TechNet E-Mail Forum. |
Date: | Mon, 7 Apr 2003 17:00:01 EDT |
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Couple comments on Russ Smith's posting:
1. I too heard that older laminate had a greenish hue, as the epoxy adhesion
promoter on the early glass fabric gave laminate a green tint (seems it was
chrome based, not silane?). Seems that 30 years ago, I remember the term
G-10, and not all was FR-4.
2. Slight correction on the pigments - blue is the color of non-halogen
phthalocyanine pigment, and green is the color when nearly fully chlorinated.
Think that is still the predominant blue/green pigment in many applications
- paints, inks, solder mask, etc. I have even heard that the environmentally
friendly Japanese symbol is a "blue leaf" symbolizing "green" ingredient
content. However, I have no confirmation. Russ, just a curious aside - Ciba
bought the DuPont blue/green pigment plant from DuPont in Delaware. It may
not have come into the Vantico fold, however.
Denny Fritz
MacDermid
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