Silicon Wafers from TTI Transition Technology International, otherwise known as TTI,is justifiably famous as a top notch supplier of silicon wafers for the semiconductor industry. Silicon Wafers are sliced from silicon ingot, which in turn is grown from polyscrystaline silicon nuggets. Silicon wafers are available in different quality levels or grades, ranging from prime to mechanical.
Prime wafers are factory sealed slices suitable for making devices on.
Test wafers are relatively high grade wafers that for whatever reason just didn't make it as prime wafers, and monitor silicon wafers are used for counting particles. Mechanical grade wafers are for applications where about the only thing you care about is that the wafer matches the mechanical properties of the primes that you will eventually run, not caring about things like electrical properties, flatness parameters or cleanliness. Silicon wafers are reclaimed and polished at Silicon 2000, which is TTI's reclaim and polishing facility in Vancouver, Washington. Reclaim is the process used when one wants to recycle or reuse silicon wafers. The process involves stripping, etching and then repolishing the wafers.