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Most single side polished wafers backside is etched. This means that the wafer's backside is not polished. The surface is rough. Etched is the step before polishing. The price of single side polished, back side etched wafer are less expensive than double side polished wafers all other specs being equal.
UniversityWafer, Inc. has a very large selection. Please provide us with your specs and quantity or you can also buy online here!