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18. What does your nomenclature -01, -02, -03, and AC, BC, AB, AN mean?

-01 means both sides of the TEC are metallized, -02 means the bottom (hot) side is metallized and -03 means neither side is metallized (bare ceramic on both sides).

AC means Alumina ceramics. BC means Beryllia ceramics. AB means there is a mix of Alumina and Beryllia on top or bottom ceramics (or within the stages of a multi-stage thermoelectric cooler). AN means Alumina Nitride.