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January 2006

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Subject:
From:
Lee parker <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Lee parker <[log in to unmask]>
Date:
Mon, 23 Jan 2006 13:30:59 -0500
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Chris

My experience has been that the likelihood of solderballs is increased with gloss or simi-gloss LPI soldermask. It is also my opinion that the visual inspection is aided by the matted soldermask.

Best regards

Lee

J. Lee Parker, Ph.D.
JLP Consultants LLC
804 779 3389
  ----- Original Message ----- 
  From: Chris Ball<mailto:[log in to unmask]> 
  To: [log in to unmask]<mailto:[log in to unmask]> 
  Sent: Monday, January 23, 2006 1:02 PM
  Subject: [TN] LPI - matte vs. gloss or semi-gloss


  Hello All-

  For many years we have specified matte finish LPI soldermask. Have a
  supplier asking us to switch to gloss or semi-gloss to avoid 'solder smear'
  issues.

  Any input as to the pros and cons of each would be appreciated.

  I think I remember issues finding fiducials with glossy mask but I might
  just be making that up, and all the equipment has changed since then
  anyway.....

  Thanks in advance,
  -Chris

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