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Subject:	Re: Nickel Plating Snarl
From:	"Goldman, Patricia J." <[log in to unmask]>
Reply To:	TechNet E-Mail Forum.
Date:	Wed, 16 Jan 2002 10:00:12 -0500
Content-Type:	text/plain
Parts/Attachments:	text/plain (42 lines)

I used to have my supplier of our gold bath measure the hardness of our gold.  They did it by taking a sample of our bath and plating it to sufficient thickness to do the Knoop hardness procedure.  The same thing should be able to be done for nickel.   There is a certain minimum thickness required to do the test properly, obviously greater than what our typical plated gold thickness was.

Patty
Patricia J. Goldman
PPG Industries, Inc.
724-274-3417
[log in to unmask]


-----Original Message-----
From: Neel, Robert [mailto:[log in to unmask]]
Sent: Tuesday, January 15, 2002 1:17 PM
To: [log in to unmask]
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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