Before answering this question, it's important to first understand what is meant by "performance part" and "functional part," and how they're viewed by the two parties that handle them: the producer and the consumer. The producer manufactures the parts, and the consumer needs (purchases) those parts and uses them in production.While a producer's intent is to have all the parts it manufactures be performance parts, sometimes there are manufacturing issues that result in the parts not meeting specification. The producer is the party that determines whether a manufactured part is a performance part.
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