After the corks are washed and dried, they are visually inspected and graded yet again. One procedure is to use a team of very highly trained workers, who individually inspect each cork to determine its quality. The latest system involves optical sensors programmed by computer to select corks on the basis of a number of factors. And while these are very fast and efficient, most cork producers will tell you that they still prefer to use people for the final check - because they are more accurate than computers.
Corks are available in many different grades, with overall wood quality being the difference.
High quality premium corks will have an improved appearance as well as a lower defect level. One of the most complicated subjects in the cork industry is the concept of grading. Because they are natural products, it is impossible to perfectly classify corks - some people may prefer one type, while others look for something else. At Cork Supply USA we have several different types of premium corks to fit any need.