Richard, what is the application? Is it found on your product? What is the product? How it is assembled? In class 10,000? Or somewhat like 10,000? With dry wall? Any renovation or reconfigurable of the line if it is dry wall.  Is your operator wear gloves? Powder less gloves? Or it is from dollar store? Does some of them got make up on?
‎No comment on where Ca come from since I know nothing about your process and material selection used on your product. Sorry.
"All professional skills are mastered by critiqued practice" - by Schon.
  Original Message
From: Richard Kraszewski
Sent: Monday, February 10, 2014 5:11 PM
To: [log in to unmask]
Reply To: TechNet E-Mail Forum
Subject: [TN] Risks Associated with Calcium


I am occasionally seeing irritating low levels of calcium in some assemblies that we test via ion chromatography.

Some organizations required spec levels as low as <1 ppm.

My questions to you techies is:

#1 Besides wash water are there any other sources of calcium that come to  mind?

#2 is there any real value in having Calcium specs down as low as 1 ppm?  (I suspect not and this spec was merely carried over from the semiconductor industry where it may have more value)

CH65 is of some help here in that is does speak much more of the evils of Na that Ca& Mg, but not as much as I had hoped.

Thoughts??

Rich  Kraszewski
Senior Process Engineer
Plexus Engineering Solutions

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask]
______________________________________________________________________

______________________________________________________________________
This email has been scanned by the Symantec Email Security.cloud service.
For more information please contact helpdesk at x2960 or [log in to unmask] 
______________________________________________________________________