Mail*Link(r) SMTP               FWD>RE>Haloing and Pinkling

Hiderori

Pinkling -- I believe the term you make reference to is "Pink Ring", which is
in the IPC-T-50, it is the leaching of the brown/red/black oxide surface
adhesion promoter the printed board manufacturer places on the surfaces of the
inner layers prior to lamination.  (The "pink ring" refers to the natural pink
salmon like color of copper.)  After drilling the holes, various
acids/chemicals preferentially attack the oxide treatment around the holes
during the surface conditioning prior to the electroless metalizations.  The
result is a subsurface "pink" colored ring around the plated-through hole on
the surfaces of the internal.  There has not been any reported failures due to
"pink ring" even though there is a local separation (void) of the desired
material at the interface between the inner layer and base material (prepreg)
resin.

COMMENT - The new IPC-A-600 "E" page 19 has a "photo" of what looks like a
"gross case" of pink ring, even though it is not "pink" in color.  The
condition shown on page 19, I believe has progressed beyond "pink ring" and is
almost a delamination void.

Haloing -- your second term,  this term is likewise covered in both the
IPC-T-50 and the IPC-A-600 "E", page 22.  Haloing is mechanically induced
fracturing or delaminating on or below the surface of the base material:  it
is usually exhibited by a light area around the holes, other machined areas or
both.

COMMENT - in addition to the definition, haloing is a local separation of the
resin from the glass fibers, which changes the reflectance of the light in the
base material and gives it haloing the normal whitish-like color appearance.  

Ralph Hersey, e-mail [log in to unmask]


--------------------------------------
Date: 3/24/96 10:22 PM
From: hidenori nagaoka
 Please teach me the definition of Pinkling and Haloing.
 Where the definitions are described in IPC Standerd.
 Please teach me IPC number.
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#027#$BIJ<AJ]>ZIt!!IJ<AI>2A5;=Q3+H/%0%k!<%W#027#(B
#027#$B1J2,!!1Q5*#027#(B


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