All,

Here it is late in the day on Friday, and a surprise pops up.

For many, many years, I have been bonding and keeping tabs on the properties of the wire we have used. 

As with most people, I have been using Be doped wire.  In all cases it has been in the 4-6 PPM range (based on analysis of the wire, not the label on the blister pack - which usually just parots what we put on the procurement specification).

Bottom line is that the most recent melt is running at nearly 8 PPM (7.9).

This places me out of range with any 'history' that I might have.  I have seen reports on Aging & Shelf Life Stability testing, probably in one of George Harman's books.  Bottom line was that after 2 years, with <10 PPM Be, no significant change was noted in tensile strength or % elongation.  However, this was an old study, and a lot of things have changed since then, with respect to wire manufacture.

Quicky testing of a large number of wires and parts does not reveal any anomalies, but .... I am wondering if something will hit me up along the back-side of my head at a later date.  Environmental testing would take too long to be of much use in the immediate situation.

Anyone out there have any comments with respect to deleterious effects of Be doping in the ~8 PPM range??
Think of non-hermetic packaging, automotove application, high rel.

I am inclined to say no-thanks to this particular wire.

Steven Creswick - Gentex Corporation
A Smarter Vision

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