Let's take a tour of your teeth. Look in the mirror at your own teeth or check out a friend's smile. The part of the tooth you can see, which is not covered by the gum (your gums are the pink, fleshy part), is called the crown.
Factory Acceptance Testing. Testing by a manufacturer of a particular product to validate its conformance to performance specifications and ratings. Source: API RP 16Q, Recommended Practice for Design, Selection, Operation and Maintenance of Marine Drilling Riser Systems, First Edition, November 1993 (Reaffirmed August 2001).
Product Validation Testing. The final step prior to going to full production is to perform the design verification tests on a sample for the pre-production lot. This validates that using the production equipment, tooling, and material provides a product that meets your design specification and durability targets.