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Basis Weight (Paper)
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The weight in pounds of 500 sheets of paper that has been cut to that paper's standard basic size. The basic size of bond paper, for example, is 17 x 22 inches. If 500 sheets (a ream) of bond paper is cut to its basic size of 17 x 22 inches and weighs 20 pounds, it is classified as 20 lb. bond. If a 17 x 22" ream of bond paper weighs 24 pounds, it is called 24 lb. bond, and so on. Basis weight is also referred to as substance weight.
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