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Subject:	Re: Nickel Plating Snarl
From:	David Hillman <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Wed, 16 Jan 2002 08:12:06 -0600
Content-Type:	text/plain
Parts/Attachments:	text/plain (58 lines)

Hi Neal!  I am just guessing but the problem may be using 100 grams to
measure a 50 mil thick plating layer - get a copy of the ASTM E384 and ASTM
E18 specifications - the restrictions/requirments for test load versus
plating thickness should be listed. Good Luck.

Dave Hillman
Rockwell Collins
[log in to unmask]




"Neel, Robert" <[log in to unmask]>@ipc.org> on 01/15/2002
12:16:59 PM

Please respond to "TechNet E-Mail Forum." <[log in to unmask]>; Please respond
      to "Neel, Robert" <[log in to unmask]>

Sent by:  TechNet <[log in to unmask]>


To:   [log in to unmask]
cc:

Subject:  [TN] Nickel Plating Snarl

Folks,

Can someone explain to me why all my PCB houses are suddenly having
"spectacular cows" over this pcb plating spec:

"CONTACT PATTERN FINISH IS ELECTROLESS NICKEL, 50 MILLIONTHS THICK, MINIMUM
40 ROCKWELL C HARDNESS, MEASURED WITH KNOOP PROCESS @ 100 GRAMS"

This pcb is the substrate for some snap-acting domes and I need a hard and
conductive bearing surface for the dome feet.  The plating spec comes from
the dome manufacturer.

Is it the "electroless"?  Is it the thickness? Is it the hardness
requirement? Is it the "nickel" vs "nickle"?  (Funny thing is, though,
everyone is very happy to do gold rather than nickel.)

What gives?

Robert


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