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Technology Stocks : AMD:News, Press Releases and Information Only!
AMD 214.25-3.1%Jan 6 3:59 PM EST
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To: Brian Hutcheson who wrote (827)9/28/1997 8:04:00 PM
From: Paul Engel   of 6843
 
Brian - Re: " that AMD's standard for high purity gas line is unequalled in the rest of the industry , according to their statement when AMD's gaslines have to negotiate a 90 degree bend , they cut the line and insert a 90 degree junction . Other customers just bend the line , this can trap moisture and ruin wafers ".

Good industry practice is to have CONTINUOUS gas lines running from the gas pad (Source) to the delivery destination (the equipment in the Fab)in order to absolutely minimize the chance of leaks which can occur at every fitting - which is what a "90 degree junction" is - assuming the fellow is talking about an "elbow", the elbow must be welded or sealed (Swage-Lok type fittings)in two places - giving rise to TWO new joints for possible leakage at EACH elbow.

Cutting a gas line and inserting an elbow also induces a potential contamination source - particles from cutting the tube, contamination in the elbow fitting, contamination from handling by the "plumber", dirt from the nearby walls where the "cut was made", and more importantly MOISTURE from the ambient easily enters the tubes when they are cut- just what the fellow was erroneously saying happens with continuous tubing.

Most gas lines are purchased from specailty houses that chemically clean and "polish" the insides of gas lines, insuring against contamination. Cutting these and inserting fittings guarantees that this special cleaning has gone to waste.

Another drawback to using elbows is the "sharp" 90 degree corner. If continuous gas flow at high volumes is a requirement, the 90 degree corner creates a flow restriction compared to a smoothly radiused, continuous curved gas line.

Perhaps you may have inadvertantly touched upon a subtle explanation for some of AMD's yield problems.

Paul
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