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September 2004

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Subject:
From:
Jeffrey Bush <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jeffrey Bush <[log in to unmask]>
Date:
Tue, 14 Sep 2004 12:53:55 -0400
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Are you using TIN/LEAD or TIN as an etch resist?



Jeffrey Bush
Director, Quality Assurance and Technical Support

                          76 Technology Drive - POB 1890
                             Brattleboro, Vermont 05302-1890
                                Tel. 802.257.4571.21 Fax. 802.257.0011
                                    [log in to unmask]
                              http://www.vtcircuits.com	



-----Original Message-----
From: - Bogert [mailto:[log in to unmask]] 
Sent: Monday, September 13, 2004 5:16 PM
To: [log in to unmask]
Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask;
What Can ...


The scotch brite is used to clean the surface to allow better adhesion
of the soldr mask.
  ----- Original Message ----- 
  From: Susan Mansilla<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Monday, September 13, 2004 2:10 PM
  Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask;
What Can ...


  Hi Mike and All
  I am familiar with the abrasive wheel cleaning processes. but those
are done
  AFTER the tin/lead has been stripped.  The response I got indicated
that the
  abrasive was used on the Tin/Lead deposit, which didn't follow my idea
of a
  possible process flow.
  Some PCB fab shops continue to use a "Scotch Brite" style of
  abrasive wheel or brush as a final surface prep operation prior to
  soldermask application.
  Susan Mansilla
  Robisan Lab

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