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Use of Copper Mask in SF6/O2 chemistry in PT-MTL

PROM Request Title: 
Use of Copper Mask in SF6/O2 chemistry in PT-MTL
PROM Request Summary: 
Request to use copper as a masking layer for etch in PT-MTL using SF6/O2 chemistry.
PROM Date: 
06/10/2014
PROM Decision: 
Rejected. Risks to both equipment and subsequent users deemed too high. Efforts to find alternative path ongoing.