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The density can be calculated by dividing the grammage of paper (in grams per square metre or "gsm") by its caliper (usually in micrometres, occasionally in mils). [1] The "ISO 534:2011, Paper and board — Determination of thickness, density and specific volume" indicates that the paper density is expressed in grams per cubic centimeter (g/cm ...
In the metric system, the mass per unit area of all types of paper and paperboard is expressed in terms of grams per square metre (g/m 2).This quantity is commonly called grammage in both English and French, [2] though printers in most English-speaking countries still refer to the "weight" of paper.
Kraft paper is sold in the US to schools in 40lb and 50lb weights. Kraft wrapping paper for shipping is also available in 60lb weight. The basis size for these weights is 3000 sqft (same basis as for newsprint, = 500 sheets at 2ft x 3ft per sheet). 1 lb = 453.6g, 3000 sqft = 278.7 sqm -> gsm weight = lb/roll weight * 1.6276; 40lb kraft paper ...
The mass per area of the paper is measured as GSM (grams per square meter). (Mass is usually measured as weight at a location with sea-level gravity.) Paper sheets are cut to a size of 10 cm × 10 cm, then the sheets are weighed individually.
Paper may be between 0.07 and 0.18 millimetres (0.0028 and 0.0071 in) thick. [20] Paper is often characterized by weight. In the United States, the weight is the weight of a ream (bundle of 500 sheets) of varying "basic sizes" before the paper is cut into the size it is sold to end customers.
Most nations describe paper in terms of grammage—the weight in grams of one sheet of the paper measuring one square meter.. Other people, especially in the United States, describe paper in terms of pound weight—the weight in pounds per ream (500 sheets) of the paper with a given area (based on historical production sizes before trimming): for card stock, this is 20 by 26 in (508 by 660 mm ...
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