Wafers can be subdivided into production wafers and test wafers according to their properties. Test wafers are mainly used to monitor process stability. The types can be subdivided into nascent test wafers. Virgin TestWafer and Reclaim Test Wafer.
Recycled wafers are not used for remanufacturing of ICs. In the semiconductor IC manufacturing process, wafers for use in monitor wafers and Dummy wafers are recycled and processed. Reduce test wafer and shelf costs. Due to the cost advantages of reconstituted wafers relative to test wafers, there is a tendency to gradually replace test wafers.