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Used in a wide variety of forms, paper and paperboard are characterized by a wide range of properties. In the thousands of paper varieties available, some properties differ only slightly and others grossly. The identification and expression of these differences depend upon the application of standard test methods, generally specified by industry and engineering associations in the papermaking countries of the world. Weight or substance per unit area, called basis weight, is a fundamental property of paper and paperboard products. From the first uses of paper in the printing trades, it has been measured in reams, originally 480 sheets (20 ...(100 of 12454 words)