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September 2004

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Subject:
From:
- Bogert <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, - Bogert <[log in to unmask]>
Date:
Wed, 15 Sep 2004 05:31:32 -0400
Content-Type:
text/plain
Parts/Attachments:
text/plain (106 lines)
Tin/lead
  ----- Original Message ----- 
  From: Jeffrey Bush<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Tuesday, September 14, 2004 12:53 PM
  Subject: Re: [TN] (2)PWB Conductive Contamination Under Solder Mask; What Can ...


  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]<mailto:[log in to unmask]>
                                http://www.vtcircuits.com<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]<mailto:[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]<mailto:[log in to unmask]>> 
    To: [log in to unmask]<mailto:[log in to unmask]<mailto:[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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