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September 2010

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Subject:
From:
Dennis Fritz <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Dennis Fritz <[log in to unmask]>
Date:
Fri, 3 Sep 2010 10:02:44 -0400
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All - We need a current description of the pigment in green solder mask.  If it is still copper phthocycanine green, it is not "GREEN"!!   That pigment is highly chlorinated blue copper phthalocycanine.   That is one reason that the Japanese used a blue colored label in the past to signify "eco-friendly".   Maybe we need to all specify clear or blue mask to be more "GREEN". I chuckle that the environmental lobby wants us to be more "GREEN", but we have to show that by using the color blue.  In the early 1970's, my second job at DuPont was making very stable blue and green copper phthalocyanine pigments. 

Denny Fritz


-----Original Message-----
From: Pete Houwen <[log in to unmask]>
To: TechNet <[log in to unmask]>
Sent: Fri, Sep 3, 2010 9:36 am
Subject: Re: [TN] NTC - Re: [TN] Is green solder mask the default by any IPC standard or is it default by common usage?


When we switch many (but not all) of our boards to RoHS, we specified red 
ask to make it very obvious to manufacturing, field service, and repair depot 
hat it was a lead free only board, as opposed to the good old green.  Any 
evelopment or pre production boards are known company wide to be any 
olor except red or green.  Clear is preferred, to see the traces up to the 
earest plane layer.
So now we've closed our captive plant, the offshore CM wants all green, all 
he time, because red might add a few pennies to the board cost.
Pete
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