Black wax for KOH etching

[Jun Zheng]

Hi, Everyone:
 
            I used to see people using black wax for protection during
KOH etching at 80C. Does anyone know the vendor and part number of this
black wax. If you know more detail, please let me know.
 
            Thanks! 
 
Jun Zheng
Senior MEMS Engineer
RheoSense Inc.
(925)866-3802
 
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